ChileNeverDie

如何使用数据库里的两个字段计算一个新的字段？

ChileNeverDie — Thu, 01 Oct 2020 16:22:19 +0800

Hi there,

我想做一个计算单价的功能，Commodity 模型数据库里有 price,net 和 unit 三个字段会用在这个功能里面，另外设置了一个 unitprice 字段来存单价，基本的计算逻辑是判断 unit 是什么，是克的话就用 price/(net*1000),是千克的话就 price/net。。。。我思考了一下似乎也不用直接把这个值写到 unitprice 里面去，只要在网页上做一个运算就行，运算量也不大，主要想问下怎么写才把这个值计算出来啊我看 Stack Overflow 上写的是用 before_save 去调用一个私有函数，但是我试了下 Rails6.0 说没有 before_save，只有 before_action，换过来以后有不知道怎么写了。。。

如何在 Rails 的下载里面增加用户名

ChileNeverDie — Sun, 23 Feb 2020 00:47:07 +0800

目前在做的项目，我在问题汇总界面加了个下载按钮，但是下载下来的话只有用户 id 没有用户的名字，求问这种情况的话，要做个什么样的 migration 才能把用户名放到下载的 csv 里面去啊

下载的 csv 文件

problem_controller.rb

def index
  @problems = Problem.paginate(page: params[:page])
  time = Time.new.strftime("%Y%m%d%H%M%S")
  filename = "Collection_at_" + time + ".csv"
  respond_to do |format|
    format.html
    format.csv { send_data @problems.to_csv, filename: filename }
  end
end

problem/index.html.erb

<span class="button">
  <p>
    <%= link_to "Download", problems_path(format: "csv"),class: "btn btn-success"  %>
  </p>
</span>

schema.rb

create_table "problems", force: :cascade do |t|
  t.datetime "detected_at"
  t.text "description"
  t.string "lob"
  t.string "status"
  t.string "productid"
  t.string "productname"
  t.string "crno"
  t.string "link"
  t.string "supplier"
  t.integer "user_id"
  t.datetime "created_at", null: false
  t.datetime "updated_at", null: false
  t.index ["user_id"], name: "index_problems_on_user_id"
end

Rails 数据库相关问题

ChileNeverDie — Wed, 19 Feb 2020 00:50:49 +0800

最近写的网站，和教程上一样，在开发测试环境是 sqlite3 数据库，在部署用的是 heroku 的 postgres 数据库，我在本地开发环境下看是没有问题的，显示很正常，

但是在 herokuapp 上就会报错，

这种的要咋整呢？直接把本地的数据库也整成 pg 么？但是之前试过会报错啊。。。

如下是 problems/index.html.erb

<% provide(:title, 'Problems List') %>
<h1>Problems List</h1>

<table border="1" align=center>
  <tr>
    <th></th>
    <th>Total</th>
    <th>BL</th>
    <th>Component</th>
  </tr>

  <!--从一开始到现在所有问题数量及细分-->
  <tr>
    <th width=80px>All</th>
    <td width=80px><%= @problems.count %></td>
    <td width=80px><%= @problems.where("lob"=>"BL").count %></td>
    <td width=80px><%= @problems.where("lob"=>"Component").count %></td>
  </tr>

  <!--去年一年内产生问题数量及细分-->
  <tr>
    <th width=80px>Last Year</th>
    <td width=80px><%= @problems.find_by_sql("select * from problems where detected_at > date('now','start of year','-1 year') AND detected_at < date('now','start of year','1 second')").count %></td>
    <td width=80px><%= @problems.find_by_sql("select * from problems where lob = 'BL' AND detected_at > date('now','start of year','-1 year') AND detected_at < date('now','start of year','1 second')").count %></td>
    <td width=80px><%= @problems.find_by_sql("select * from problems where lob = 'Component' AND detected_at > date('now','start of year','-1 year') AND detected_at < date('now','start of year','1 second')").count %></td>
  </tr>

  <!--滚动的12个月内产生的问题数量及细分,包括本月数据,今天是2020.2.15，查询2019.2.15-至今的数据-->
  <tr>
    <th width=130px>Previous 12 Month</th>
    <td width=80px><%= @problems.find_by_sql("select * from problems where detected_at > date('now','start of day','-12 month') AND detected_at < date('now')").count %></td>
    <td width=80px><%= @problems.find_by_sql("select * from problems where lob = 'BL' AND detected_at > date('now','start of day','-12 month') AND detected_at < date('now')").count %></td>
    <td width=80px><%= @problems.find_by_sql("select * from problems where lob = 'Component' AND detected_at > date('now','start of day','-12 month') AND detected_at < date('now')").count %></td>
  </tr>

  <!--上个月产生的问题数量及细分，不包括本月数据-->
  <tr>
    <th>Last Month</th>
    <td width=80px><%= @problems.find_by_sql("select * from problems where detected_at > date('now','start of month','-1 month') AND detected_at < date('now','start of month','-1 second')").count %></td>
    <td width=80px><%= @problems.find_by_sql("select * from problems where lob = 'BL' AND detected_at > date('now','start of month',' -1 month') AND detected_at < date('now','start of month','-1 second')").count %></td>
    <td width=80px><%= @problems.find_by_sql("select * from problems where lob = 'Component' AND detected_at > date('now','start of month',' -1 month')  AND detected_at < date('now','start of month','-1 second')").count %></td>
  </tr>

  <!--本月产生问题及细分-->
  <tr>
    <th>This Month</th>
    <td width=80px><%= @problems.find_by_sql("select * from problems where detected_at > date('now','start of month','1 second')").count %></td>
    <td width=80px><%= @problems.find_by_sql("select * from problems where lob = 'BL' AND detected_at > date('now','start of month','1 second')").count %></td>
    <td width=80px><%= @problems.find_by_sql("select * from problems where lob = 'Component' AND detected_at > date('now','start of month','1 second')").count %></td>
  </tr>
</table>

<span class="button">
  <p>
    <%= link_to "Download", problems_path(format: "csv"),class: "btn btn-success"  %>
    <!--Search function to be finished  -->
    <!--<div>-->
    <!--  <form class="navbar-form d-none d-lg-flex mr-2 form-search active" action="/search" method="GET">-->
    <!--    <i class="fa btn-search fa-search"></i>-->
    <!--    <input class="form-control" name="q" type="text" value placeholder="Search..."> -->
    <!--  </form>-->
    <!--</div>-->
  </p>
</span>

<table border = "1" width = 100%>
    <tr>
      <th align="center">User</th>
      <th>Product Name</th>
      <th>Detected at</th>
      <th>Supplier</th>
      <th>CR No.</th>
      <th>CR Link</th>
      <th class="tha">Description</th>
      <th>Status</th>
      <th colspan="3">Operation</th>
    </tr>

  <tbody>
    <% @problems.each do |problem| %>
      <tr>
        <%= will_paginate %>
        <td align=center><%= link_to problem.user.name, problem.user %></td>
        <td align=center><%= problem.productname %></td>
        <td align=center><%= problem.detected_at.strftime("%Y-%m-%d")%></td>
        <td align=center><%= problem.supplier %></td>
        <td align=center><%= problem.crno %></td>
        <span>
          <% if problem.link.to_s.blank? %>
            <td></td>
          <% else %>
            <td align=center><%= link_to "Link",problem.link, :target => '_blank' %></td>
          <% end %>
        </span>
        <td width=50% align=left><%= problem.description %></td>
        <td align=center><%= problem.status %></td>
        <span class="DO">
          <% if current_user?(problem.user) %>
            <td align=center width =3%><%= link_to "Detail", problem %></td>
            <td align=center width =3%><%= link_to "Edit", edit_problem_path(problem) %></td>
            <td width = 3%><%= link_to "Delete", problem, method: :delete, data: { confirm: "You sure?" } %></td>
          <% else %>
            <td><%= link_to "Detail", problem%></td>
            <td></td>
            <td></td>
          <% end %> 
        </span>
        <%= will_paginate %>
      </tr>
    <% end %>
  </tbody>
</table>

heroku log:

ubuntu:~/environment/SEQ_Rails5.2.0 (master) $ heroku logs
2020-02-18T15:57:00.802023+00:00 app[web.1]: I, [2020-02-18T15:57:00.801952 #8]  INFO -- : [713c5fd0-b627-428a-a505-cfd10da014c5] Completed 200 OK in 273ms (Views: 235.2ms | ActiveRecord: 7.3ms)
2020-02-18T15:57:00.804529+00:00 heroku[router]: at=info method=GET path="/" host=seq6.herokuapp.com request_id=713c5fd0-b627-428a-a505-cfd10da014c5 fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=1ms service=279ms status=200 bytes=7353 protocol=https
2020-02-18T15:57:28.082160+00:00 app[web.1]: I, [2020-02-18T15:57:28.082054 #10]  INFO -- : [ff6e6a9c-5866-4908-98b7-c58dd0dd651b] Started POST "/problems" for 58.220.95.42 at 2020-02-18 15:57:28 +0000
2020-02-18T15:57:28.082965+00:00 app[web.1]: I, [2020-02-18T15:57:28.082906 #10]  INFO -- : [ff6e6a9c-5866-4908-98b7-c58dd0dd651b] Processing by ProblemsController#create as HTML
2020-02-18T15:57:28.083048+00:00 app[web.1]: I, [2020-02-18T15:57:28.082996 #10]  INFO -- : [ff6e6a9c-5866-4908-98b7-c58dd0dd651b]   Parameters: {"utf8"=>"✓", "authenticity_token"=>"8lWnf2/7/ciIe4q8DztzJvvIgLFQTA2jYtPjNfkfhJf71Q4ZkaQ8VXIOe6ELd5JxAD34N+7F3Wr0tn0h9WlNxw==", "problem"=>{"productid"=>"001", "productname"=>"Test", "detected_at(1i)"=>"2020", "detected_at(2i)"=>"2", "detected_at(3i)"=>"18", "description"=>"Oline test", "supplier"=>"G-shank", "lob"=>"Component", "status"=>"Open", "crno"=>"001", "link"=>"https://www.baidu.com"}, "commit"=>"Submit"}
2020-02-18T15:57:28.087494+00:00 app[web.1]: D, [2020-02-18T15:57:28.087426 #10] DEBUG -- : [ff6e6a9c-5866-4908-98b7-c58dd0dd651b]   User Load (1.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
2020-02-18T15:57:28.125359+00:00 app[web.1]: D, [2020-02-18T15:57:28.125223 #10] DEBUG -- : [ff6e6a9c-5866-4908-98b7-c58dd0dd651b]    (0.8ms)  BEGIN
2020-02-18T15:57:28.131310+00:00 app[web.1]: D, [2020-02-18T15:57:28.131202 #10] DEBUG -- : [ff6e6a9c-5866-4908-98b7-c58dd0dd651b]   Problem Create (2.9ms)  INSERT INTO "problems" ("detected_at", "description", "lob", "status", "productid", "productname", "crno", "link", "supplier", "user_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12) RETURNING "id"  [["detected_at", "2020-02-18 00:00:00"], ["description", "Oline test"], ["lob", "Component"], ["status", "Open"], ["productid", "001"], ["productname", "Test"], ["crno", "001"], ["link", "https://www.baidu.com"], ["supplier", "G-shank"], ["user_id", 1], ["created_at", "2020-02-18 15:57:28.126483"], ["updated_at", "2020-02-18 15:57:28.126483"]]
2020-02-18T15:57:28.134075+00:00 app[web.1]: D, [2020-02-18T15:57:28.133980 #10] DEBUG -- : [ff6e6a9c-5866-4908-98b7-c58dd0dd651b]    (2.2ms)  COMMIT
2020-02-18T15:57:28.134712+00:00 app[web.1]: I, [2020-02-18T15:57:28.134618 #10]  INFO -- : [ff6e6a9c-5866-4908-98b7-c58dd0dd651b] Redirected to https://seq6.herokuapp.com/
2020-02-18T15:57:28.134983+00:00 app[web.1]: I, [2020-02-18T15:57:28.134890 #10]  INFO -- : [ff6e6a9c-5866-4908-98b7-c58dd0dd651b] Completed 302 Found in 52ms (ActiveRecord: 12.6ms)
2020-02-18T15:57:28.137392+00:00 heroku[router]: at=info method=POST path="/problems" host=seq6.herokuapp.com request_id=ff6e6a9c-5866-4908-98b7-c58dd0dd651b fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=0ms service=57ms status=302 bytes=994 protocol=https
2020-02-18T15:57:29.419249+00:00 heroku[router]: at=info method=GET path="/" host=seq6.herokuapp.com request_id=a4d2e770-4a2a-4582-a69c-833bd48adaec fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=0ms service=24ms status=200 bytes=8459 protocol=https
2020-02-18T15:57:29.395417+00:00 app[web.1]: I, [2020-02-18T15:57:29.395315 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec] Started GET "/" for 58.220.95.42 at 2020-02-18 15:57:29 +0000
2020-02-18T15:57:29.396244+00:00 app[web.1]: I, [2020-02-18T15:57:29.396168 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec] Processing by StaticPagesController#home as HTML
2020-02-18T15:57:29.398927+00:00 app[web.1]: D, [2020-02-18T15:57:29.398854 #8] DEBUG -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   User Load (0.9ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
2020-02-18T15:57:29.400729+00:00 app[web.1]: I, [2020-02-18T15:57:29.400644 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Rendering static_pages/home.html.erb within layouts/application
2020-02-18T15:57:29.402860+00:00 app[web.1]: D, [2020-02-18T15:57:29.402787 #8] DEBUG -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]    (1.1ms)  SELECT COUNT(*) FROM "problems" WHERE "problems"."user_id" = $1  [["user_id", 1]]
2020-02-18T15:57:29.403031+00:00 app[web.1]: I, [2020-02-18T15:57:29.402963 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Rendered shared/_user_info.html.erb (2.1ms)
2020-02-18T15:57:29.403473+00:00 app[web.1]: I, [2020-02-18T15:57:29.403404 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Rendered shared/_error_messages.html.erb (0.0ms)
2020-02-18T15:57:29.406990+00:00 app[web.1]: I, [2020-02-18T15:57:29.406913 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Rendered shared/_problem_form.html.erb (3.8ms)
2020-02-18T15:57:29.408439+00:00 app[web.1]: D, [2020-02-18T15:57:29.408364 #8] DEBUG -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]    (0.9ms)  SELECT COUNT(*) FROM "problems" WHERE (user_id = 1)
2020-02-18T15:57:29.410262+00:00 app[web.1]: D, [2020-02-18T15:57:29.410184 #8] DEBUG -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Problem Load (1.2ms)  SELECT  "problems".* FROM "problems" WHERE (user_id = 1) ORDER BY "problems"."created_at" DESC LIMIT $1 OFFSET $2  [["LIMIT", 30], ["OFFSET", 0]]
2020-02-18T15:57:29.413594+00:00 app[web.1]: D, [2020-02-18T15:57:29.413503 #8] DEBUG -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   CACHE User Load (0.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
2020-02-18T15:57:29.414153+00:00 app[web.1]: I, [2020-02-18T15:57:29.414079 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Rendered collection of problems/_problem.html.erb [1 times] (2.9ms)
2020-02-18T15:57:29.414332+00:00 app[web.1]: I, [2020-02-18T15:57:29.414266 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Rendered shared/_feed.html.erb (7.2ms)
2020-02-18T15:57:29.414438+00:00 app[web.1]: I, [2020-02-18T15:57:29.414375 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Rendered static_pages/home.html.erb within layouts/application (13.6ms)
2020-02-18T15:57:29.415019+00:00 app[web.1]: I, [2020-02-18T15:57:29.414951 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Rendered layouts/_shim.html.erb (0.0ms)
2020-02-18T15:57:29.415616+00:00 app[web.1]: I, [2020-02-18T15:57:29.415534 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Rendered layouts/_header.html.erb (0.4ms)
2020-02-18T15:57:29.415885+00:00 app[web.1]: I, [2020-02-18T15:57:29.415810 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec]   Rendered layouts/_footer.html.erb (0.1ms)
2020-02-18T15:57:29.416172+00:00 app[web.1]: I, [2020-02-18T15:57:29.416100 #8]  INFO -- : [a4d2e770-4a2a-4582-a69c-833bd48adaec] Completed 200 OK in 20ms (Views: 12.3ms | ActiveRecord: 4.2ms)
2020-02-18T15:57:30.532439+00:00 heroku[router]: at=info method=GET path="/assets/application-d283aae496f2056cf7291fdec8f108d447106cf2e12c69faf064db254b4bcda1.js" host=seq6.herokuapp.com request_id=af8e7a07-2864-41a3-9688-fbf149b5f2e7 fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=0ms service=1ms status=304 bytes=112 protocol=https
2020-02-18T15:57:30.551913+00:00 heroku[router]: at=info method=GET path="/assets/application-7b7f66883d7ab50ceac9557c180d2088a847d5408d58c39d179c789af310fafe.css" host=seq6.herokuapp.com request_id=a64bf8a1-264f-4970-ad9b-08a193a4c784 fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=1ms service=2ms status=304 bytes=112 protocol=https
2020-02-18T15:57:30.645428+00:00 heroku[router]: at=info method=GET path="/assets/se-logo-white-91a31cc55317c3643962a790342733788eb02cf59f89e114157c6efd7042aab3.png" host=seq6.herokuapp.com request_id=7d4d126e-da25-4881-b0c6-9a879c31b810 fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=1ms service=2ms status=304 bytes=112 protocol=https
2020-02-18T15:57:32.057874+00:00 heroku[router]: at=info method=GET path="/favicon.ico" host=seq6.herokuapp.com request_id=aab871f8-905c-44c3-8de6-40efe6ad0fe1 fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=0ms service=1ms status=304 bytes=112 protocol=https
2020-02-18T15:59:00.511894+00:00 heroku[router]: at=info method=POST path="/problems" host=seq6.herokuapp.com request_id=8bc54d4f-f5b1-4c44-b63c-a546c93271ed fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=1ms service=21ms status=302 bytes=1000 protocol=https
2020-02-18T15:59:00.493534+00:00 app[web.1]: I, [2020-02-18T15:59:00.493428 #8]  INFO -- : [8bc54d4f-f5b1-4c44-b63c-a546c93271ed] Started POST "/problems" for 58.220.95.42 at 2020-02-18 15:59:00 +0000
2020-02-18T15:59:00.494479+00:00 app[web.1]: I, [2020-02-18T15:59:00.494409 #8]  INFO -- : [8bc54d4f-f5b1-4c44-b63c-a546c93271ed] Processing by ProblemsController#create as HTML
2020-02-18T15:59:00.494565+00:00 app[web.1]: I, [2020-02-18T15:59:00.494501 #8]  INFO -- : [8bc54d4f-f5b1-4c44-b63c-a546c93271ed]   Parameters: {"utf8"=>"✓", "authenticity_token"=>"5tG3tNSS3oQl8MG2gGLzq31cnV5hRD/j9WOPqg6RkMSkUYKISagvyyNwfWvVbLFROmwJP5N0HYba8i8wn7jTZw==", "problem"=>{"productid"=>"LPHA39363", "productname"=>"Component Sample", "detected_at(1i)"=>"2020", "detected_at(2i)"=>"2", "detected_at(3i)"=>"18", "description"=>"Copper Mark", "supplier"=>"G-shank", "lob"=>"Component", "status"=>"Open", "crno"=>"CR-2547236", "link"=>"https://se.lightning.force.com/lightning/r/ComplaintRequest__c/a8s1H000001B6MVQA0/view"}, "commit"=>"Submit"}
2020-02-18T15:59:00.497601+00:00 app[web.1]: D, [2020-02-18T15:59:00.497531 #8] DEBUG -- : [8bc54d4f-f5b1-4c44-b63c-a546c93271ed]   User Load (0.8ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
2020-02-18T15:59:00.501042+00:00 app[web.1]: D, [2020-02-18T15:59:00.500973 #8] DEBUG -- : [8bc54d4f-f5b1-4c44-b63c-a546c93271ed]    (0.7ms)  BEGIN
2020-02-18T15:59:00.504225+00:00 app[web.1]: D, [2020-02-18T15:59:00.504140 #8] DEBUG -- : [8bc54d4f-f5b1-4c44-b63c-a546c93271ed]   Problem Create (1.3ms)  INSERT INTO "problems" ("detected_at", "description", "lob", "status", "productid", "productname", "crno", "link", "supplier", "user_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12) RETURNING "id"  [["detected_at", "2020-02-18 00:00:00"], ["description", "Copper Mark"], ["lob", "Component"], ["status", "Open"], ["productid"], ["productname", "Component Sample"], ["user_id", 1], ["created_at", "2020-02-18 15:59:00.501748"], ["updated_at", "2020-02-18 15:59:00.501748"]]
2020-02-18T15:59:00.506423+00:00 app[web.1]: D, [2020-02-18T15:59:00.506353 #8] DEBUG -- : [8bc54d4f-f5b1-4c44-b63c-a546c93271ed]    (1.9ms)  COMMIT
2020-02-18T15:59:00.507014+00:00 app[web.1]: I, [2020-02-18T15:59:00.506941 #8]  INFO -- : [8bc54d4f-f5b1-4c44-b63c-a546c93271ed] Redirected to https://seq6.herokuapp.com/
2020-02-18T15:59:00.507206+00:00 app[web.1]: I, [2020-02-18T15:59:00.507145 #8]  INFO -- : [8bc54d4f-f5b1-4c44-b63c-a546c93271ed] Completed 302 Found in 13ms (ActiveRecord: 4.7ms)
2020-02-18T15:59:00.836106+00:00 heroku[router]: at=info method=GET path="/" host=seq6.herokuapp.com request_id=c81ebf94-fb17-4011-ad5d-f5fcac7c93d4 fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=1ms service=41ms status=200 bytes=9589 protocol=https
2020-02-18T15:59:00.794159+00:00 app[web.1]: I, [2020-02-18T15:59:00.794024 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4] Started GET "/" for 58.220.95.42 at 2020-02-18 15:59:00 +0000
2020-02-18T15:59:00.795079+00:00 app[web.1]: I, [2020-02-18T15:59:00.795004 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4] Processing by StaticPagesController#home as HTML
2020-02-18T15:59:00.797695+00:00 app[web.1]: D, [2020-02-18T15:59:00.797618 #10] DEBUG -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   User Load (0.8ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
2020-02-18T15:59:00.800775+00:00 app[web.1]: I, [2020-02-18T15:59:00.800688 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Rendering static_pages/home.html.erb within layouts/application
2020-02-18T15:59:00.804555+00:00 app[web.1]: D, [2020-02-18T15:59:00.804467 #10] DEBUG -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]    (1.2ms)  SELECT COUNT(*) FROM "problems" WHERE "problems"."user_id" = $1  [["user_id", 1]]
2020-02-18T15:59:00.804802+00:00 app[web.1]: I, [2020-02-18T15:59:00.804739 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Rendered shared/_user_info.html.erb (3.0ms)
2020-02-18T15:59:00.807273+00:00 app[web.1]: I, [2020-02-18T15:59:00.807200 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Rendered shared/_error_messages.html.erb (0.4ms)
2020-02-18T15:59:00.811456+00:00 app[web.1]: I, [2020-02-18T15:59:00.811385 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Rendered shared/_problem_form.html.erb (6.2ms)
2020-02-18T15:59:00.814334+00:00 app[web.1]: D, [2020-02-18T15:59:00.814105 #10] DEBUG -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]    (1.2ms)  SELECT COUNT(*) FROM "problems" WHERE (user_id = 1)
2020-02-18T15:59:00.816098+00:00 app[web.1]: D, [2020-02-18T15:59:00.815984 #10] DEBUG -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Problem Load (1.1ms)  SELECT  "problems".* FROM "problems" WHERE (user_id = 1) ORDER BY "problems"."created_at" DESC LIMIT $1 OFFSET $2  [["LIMIT", 30], ["OFFSET", 0]]
2020-02-18T15:59:00.819255+00:00 app[web.1]: D, [2020-02-18T15:59:00.819166 #10] DEBUG -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   CACHE User Load (0.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
2020-02-18T15:59:00.821142+00:00 app[web.1]: D, [2020-02-18T15:59:00.821053 #10] DEBUG -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   CACHE User Load (0.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
2020-02-18T15:59:00.821977+00:00 app[web.1]: I, [2020-02-18T15:59:00.821895 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Rendered collection of problems/_problem.html.erb [2 times] (4.8ms)
2020-02-18T15:59:00.822213+00:00 app[web.1]: I, [2020-02-18T15:59:00.822132 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Rendered shared/_feed.html.erb (10.2ms)
2020-02-18T15:59:00.822378+00:00 app[web.1]: I, [2020-02-18T15:59:00.822311 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Rendered static_pages/home.html.erb within layouts/application (21.5ms)
2020-02-18T15:59:00.823582+00:00 app[web.1]: I, [2020-02-18T15:59:00.823501 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Rendered layouts/_shim.html.erb (0.1ms)
2020-02-18T15:59:00.824352+00:00 app[web.1]: I, [2020-02-18T15:59:00.824284 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Rendered layouts/_header.html.erb (0.6ms)
2020-02-18T15:59:00.824597+00:00 app[web.1]: I, [2020-02-18T15:59:00.824536 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4]   Rendered layouts/_footer.html.erb (0.1ms)
2020-02-18T15:59:00.824924+00:00 app[web.1]: I, [2020-02-18T15:59:00.824846 #10]  INFO -- : [c81ebf94-fb17-4011-ad5d-f5fcac7c93d4] Completed 200 OK in 30ms (Views: 21.3ms | ActiveRecord: 4.4ms)
2020-02-18T15:59:01.469663+00:00 heroku[router]: at=info method=GET path="/assets/application-7b7f66883d7ab50ceac9557c180d2088a847d5408d58c39d179c789af310fafe.css" host=seq6.herokuapp.com request_id=b6e2d915-33a0-44fd-8647-0ef537273bd9 fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=1ms service=5ms status=304 bytes=112 protocol=https
2020-02-18T15:59:01.787299+00:00 heroku[router]: at=info method=GET path="/assets/se-logo-white-91a31cc55317c3643962a790342733788eb02cf59f89e114157c6efd7042aab3.png" host=seq6.herokuapp.com request_id=e7797cc7-b4b5-420d-9e86-7282479b3582 fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=1ms service=5ms status=304 bytes=112 protocol=https
2020-02-18T15:59:02.603285+00:00 heroku[router]: at=info method=GET path="/assets/application-d283aae496f2056cf7291fdec8f108d447106cf2e12c69faf064db254b4bcda1.js" host=seq6.herokuapp.com request_id=a6e56b91-ecea-440c-b8d4-5e76b84bc9b7 fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=0ms service=2ms status=304 bytes=112 protocol=https
2020-02-18T15:59:02.935910+00:00 heroku[router]: at=info method=GET path="/favicon.ico" host=seq6.herokuapp.com request_id=30c2ce8a-4161-40af-b398-5518a6152ac0 fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=0ms service=1ms status=304 bytes=112 protocol=https
2020-02-18T15:59:18.240664+00:00 heroku[router]: at=info method=GET path="/problems" host=seq6.herokuapp.com request_id=01f5fad1-47af-4e1e-98e7-44e00ab719cc fwd="218.81.13.62,58.220.95.42" dyno=web.1 connect=0ms service=25ms status=500 bytes=1891 protocol=https
2020-02-18T15:59:18.215499+00:00 app[web.1]: I, [2020-02-18T15:59:18.215345 #8]  INFO -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc] Started GET "/problems" for 58.220.95.42 at 2020-02-18 15:59:18 +0000
2020-02-18T15:59:18.216635+00:00 app[web.1]: I, [2020-02-18T15:59:18.216555 #8]  INFO -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc] Processing by ProblemsController#index as HTML
2020-02-18T15:59:18.221539+00:00 app[web.1]: D, [2020-02-18T15:59:18.221363 #8] DEBUG -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc]   User Load (0.9ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
2020-02-18T15:59:18.223733+00:00 app[web.1]: I, [2020-02-18T15:59:18.223669 #8]  INFO -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc]   Rendering problems/index.html.erb within layouts/application
2020-02-18T15:59:18.225879+00:00 app[web.1]: D, [2020-02-18T15:59:18.225813 #8] DEBUG -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc]    (1.1ms)  SELECT COUNT(*) FROM "problems"
2020-02-18T15:59:18.228447+00:00 app[web.1]: D, [2020-02-18T15:59:18.228281 #8] DEBUG -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc]    (1.6ms)  SELECT COUNT(*) FROM "problems" WHERE "problems"."lob" = $1  [["lob", "BL"]]
2020-02-18T15:59:18.230207+00:00 app[web.1]: D, [2020-02-18T15:59:18.230119 #8] DEBUG -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc]    (1.0ms)  SELECT COUNT(*) FROM "problems" WHERE "problems"."lob" = $1  [["lob", "Component"]]
2020-02-18T15:59:18.233321+00:00 app[web.1]: D, [2020-02-18T15:59:18.233233 #8] DEBUG -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc]   Problem Load (2.7ms)  select * from problems where detected_at > date('now','start of year','-1 year') AND detected_at < date('now','start of year','1 second')
2020-02-18T15:59:18.234250+00:00 app[web.1]: I, [2020-02-18T15:59:18.234178 #8]  INFO -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc]   Rendered problems/index.html.erb within layouts/application (10.4ms)
2020-02-18T15:59:18.234566+00:00 app[web.1]: I, [2020-02-18T15:59:18.234497 #8]  INFO -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc] Completed 500 Internal Server Error in 18ms (ActiveRecord: 7.4ms)
2020-02-18T15:59:18.235885+00:00 app[web.1]: F, [2020-02-18T15:59:18.235785 #8] FATAL -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc]
2020-02-18T15:59:18.236207+00:00 app[web.1]: F, [2020-02-18T15:59:18.236111 #8] FATAL -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc] ActionView::Template::Error (PG::UndefinedFunction: ERROR:  function date(unknown, unknown, unknown) does not exist
2020-02-18T15:59:18.236210+00:00 app[web.1]: LINE 1: select * from problems where detected_at > date('now','start...
2020-02-18T15:59:18.236211+00:00 app[web.1]: ^
2020-02-18T15:59:18.236212+00:00 app[web.1]: HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
2020-02-18T15:59:18.236213+00:00 app[web.1]: : select * from problems where detected_at > date('now','start of year','-1 year') AND detected_at < date('now','start of year','1 second')):
2020-02-18T15:59:18.236599+00:00 app[web.1]: F, [2020-02-18T15:59:18.236531 #8] FATAL -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc]     20:   <!--去年一年内产生问题数量及细分-->
2020-02-18T15:59:18.236600+00:00 app[web.1]: [01f5fad1-47af-4e1e-98e7-44e00ab719cc]     21:   <tr>
2020-02-18T15:59:18.236600+00:00 app[web.1]: [01f5fad1-47af-4e1e-98e7-44e00ab719cc]     22:     <th width=80px>Last Year</th>
2020-02-18T15:59:18.236601+00:00 app[web.1]: [01f5fad1-47af-4e1e-98e7-44e00ab719cc]     23:     <td width=80px><%= @problems.find_by_sql("select * from problems where detected_at > date('now','start of year','-1 year') AND detected_at < date('now','start of year','1 second')").count %></td>
2020-02-18T15:59:18.236601+00:00 app[web.1]: [01f5fad1-47af-4e1e-98e7-44e00ab719cc]     24:     <td width=80px><%= @problems.find_by_sql("select * from problems where lob = 'BL' AND detected_at > date('now','start of year','-1 year') AND detected_at < date('now','start of year','1 second')").count %></td>
2020-02-18T15:59:18.236602+00:00 app[web.1]: [01f5fad1-47af-4e1e-98e7-44e00ab719cc]     25:     <td width=80px><%= @problems.find_by_sql("select * from problems where lob = 'Component' AND detected_at > date('now','start of year','-1 year') AND detected_at < date('now','start of year','1 second')").count %></td>
2020-02-18T15:59:18.236602+00:00 app[web.1]: [01f5fad1-47af-4e1e-98e7-44e00ab719cc]     26:   </tr>
2020-02-18T15:59:18.236701+00:00 app[web.1]: F, [2020-02-18T15:59:18.236639 #8] FATAL -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc]
2020-02-18T15:59:18.236808+00:00 app[web.1]: F, [2020-02-18T15:59:18.236746 #8] FATAL -- : [01f5fad1-47af-4e1e-98e7-44e00ab719cc] app/views/problems/index.html.erb:23:in `_app_views_problems_index_html_erb___932626950221506039_47343375589820'
2020-02-18T16:36:04.469330+00:00 heroku[web.1]: Idling
2020-02-18T16:36:04.473752+00:00 heroku[web.1]: State changed from up to down
2020-02-18T16:36:05.388424+00:00 app[web.1]: [4] - Gracefully shutting down workers...
2020-02-18T16:36:05.375947+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2020-02-18T16:36:05.491257+00:00 heroku[web.1]: Process exited with status 143

页面跳转后出现无法提交编辑的问题

ChileNeverDie — Sun, 16 Feb 2020 17:41:28 +0800

环境：AWS Ubuntu Ruby 版本：2.6.5 Rails 版本：5.2.4

问题是这样的我写了个小网站，可以登录进去记录自己碰到的问题，有编辑功能方便更改问题的状态，但是点击编辑按钮以后，能够正常跳转，但是无法在修改内容后点击 submit 键提交，在 console 发现如下提示： Cannot render console from 58...42! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255 求问碰到这样的问题，该咋整？我看网上说是添加白名单，但是没找到那个文件

另外，如果我在跳转完以后刷新页面，就可以正常提交。

求网站的搜索功能

ChileNeverDie — Sun, 16 Feb 2020 00:26:49 +0800

想要一个 Ruby-China 的搜索功能。。。就右上角那个

或者这个功能有没有 Gem 可以参考啊？我找了很久没找到。。。如果能够有下拉框，选择想要找的类别就更好了。。。

Rails 如何跳转外链？

ChileNeverDie — Wed, 05 Feb 2020 18:50:16 +0800

问题如题：我现在写的一个网站，某个模型里有一个字段存的是一条外部链接，但我试了下教程里的<%= link_to> 和‘<'a href =>(直接写这个它就变成链接了。。。)，都是直接在原来的网站后面加上填写的内容，比如我现在在 link 字段里面存的是 www.baidu.com，我想能点一下直接跳转到页面，，但是现在变成了这样：

<%= link_to "CSR", problem.link.to_s %>

<%= redirect_to "CSR", problem.link.to_s %>

"SCR" （你点一下就知道了 QAQ）

如何将锁定 rails 版本的项目降级

ChileNeverDie — Sat, 01 Feb 2020 16:54:18 +0800

碰到个问题，目前用的是最新的 rails6，但是有个 gem 只支持 5.2，但是我创建项目的时候执行的是

Rails _6.0.1_ new ***

如何解锁并降级？

MS Access 数据库接入的工具

ChileNeverDie — Sat, 11 Jan 2020 20:47:50 +0800

各位前辈，

想了解一下 RoR 有没有能和 MS Access 数据库交互的 gem 啊，在网上找了下没查到相关的资料，只有只言片语，不得其解，求助~

上传图片显示无 display_image 方法

ChileNeverDie — Thu, 09 Jan 2020 15:29:33 +0800

还是 Rails 教程，错误如图：

已经安装了 imagemagick，添加了 gem 'image_processing', '1.9.3'，gem 'mini_magick', '4.9.5' 并且在 models/problem.rb内定义了display_image方法，如代码

class Problem < ApplicationRecord
  belongs_to :user
  has_one_attached :image
  default_scope -> { order(created_at: :desc) } 
  validates :user_id, presence: true 
  validates :ProductID, presence: true
  validates :ProductName, presence: true
  validates :BOL, presence: true, inclusion: {in:['Component','BL'],message:'Must be "Component" or "BL"'} 
  validates :Description, presence, length: {maximum: 500}
  validates :image, content_type: {in: %w[image/jpeg image/gif image/png], message: "must be a valid image format" },
                            size: { less_than: 5.megabytes, message: "should be less than 5MB" } 

  # 返回调整尺寸后的图像，供显示                            
  def display_image 
    image.variant(resize_to_limit: [500, 500])
  end 

end

而且我还发现。。。如果我把 has_one_attached:image 改成 have_many_attached，这个错误就会变成 image 方法找不到，display_image 方法居然就不报错了。。

_problem.html.erb

<li id="problem-<%= problem.id %>">
  <%= link_to gravatar_for(problem.user, size: 50), problem.user %>

  <span class="user"><%= link_to problem.user.name, problem.user %></span>
  <span class="content">
    <%= problem.DetectDate %> | <%= problem.ProductName %>  |  <%= problem.Description %>
    <%= image_tag problem.display_image if problem.image.attached? %>
  </span>

  <span class="timestamp">
    Posted <%= time_ago_in_words(problem.created_at) %> ago.
    <% if current_user?(problem.user) %>
      <%= link_to "delete", problem, method: :delete, data: { confirm: "You sure?" } %>
    <% end %> 
  </span>
</li>

如果将

<%= image_tag problem.display_image if problem.image.attached? %>

改为

<%= image_tag problem.image if problem.image.attached? %>

不会报错，但是无法控制图片大小。。。

problems_controller.rb

class ProblemsController < ApplicationController
  before_action :logged_in_user, only: [:create, :destroy]
  before_action :correct_user, only: :destroy

  def create
    @problem = current_user.problems.build(problem_params)
    @problem.image.attach(params[:problem][:image]) 
    if @problem.save
      flash[:success] = "Problem created!"
      redirect_to root_url
    else
      @feed_items = current_user.feed.paginate(page: params[:page]) 
    end
  end


  def destroy
    @problem.destroy
    flash[:success] = "Problem deleted"
    redirect_to request.referrer || root_url
  end


  private
    def problem_params
      params.require(:problem).permit(:ProductID, :ProductName, :SupplierName, :DetectDate, :Description, :PIC, :BOL, :SolvedOrNot, :image)
    end

    def correct_user
      @problem = current_user.problems.find_by(id: params[:id])
      redirect_to root_url if @problem.nil? 
    end
end

Rails 6.0.1 dropdown 鼠标指上去无法下拉，请前辈们解惑

ChileNeverDie — Tue, 07 Jan 2020 09:25:54 +0800

最近在跟着 RoR 教程做一个网站，Rails 版本 6.0.1，在 Account 这个文字上设置了 dropdown，但是鼠标指上去以后并没有下拉显示。如下是在 app/views/layouts/_header.html.rb 里面关于 dropdown 的代码：

<header class="navbar navbar-fixed-top navbar-inverse"> 
  <small>
    <div class="container">
      <%= link_to image_tag("*", alt: "*"), home_path, id: "logo_left" %> 
      <nav> 
        <ul class="nav navbar-nav navbar-right"> 
          <li><%= link_to "Help", help_path %></li>
          <% if logged_in? %>
            <li><%= link_to "Users", '#' %></li>
            <li class="dropdown">
              <a href="#", class="dropdown-toggle", data-toggle="dropdown">
                Account <b class="caret"></b> 
              </a>
              <ul class="dropdown-menu">
                <li><%= link_to "Profile", current_user %></li>
                <li><%= link_to "Settings", '#' %></li>
                <li class="divider"></li>
                <li> 
                  <%= link_to "Log out", logout_path, method: :delete %>
                </li>
              </ul>
            </li> 
          <% else %>
            <li><%= link_to "Log in", login_path %></li>
          <% end %>
        </ul>
      </nav> 
    </div>
  </small>
</header>

我忽然想起来，这个还要在 application.js 中引入 Bootstrap JavaScript 库，但问题是昨天我做的时候，在 app/assets 里没有/javascripts 这个文件夹，更没有 application.js 这个文件。。。于是我从另一个文件夹里拷贝改名了一个文件。。。这个会不会有影响？

问题已解决，见评论 logout 这个功能，我已经在 config/routes.rb 里面指定了

delete '/logout', to: 'sessions#destroy'

直接在链接后增加/logout 显示 No route matches [GET] "/logout" Rails.root: /home/ubuntu/environment/*** 但是他下面却显示有这个 routes

logout 相关代码： app/controllers/session_controller

class SessionsController < ApplicationController
  def new
  end

  def create
    user = User.find_by(email: params[:session][:email].downcase)
    if user && user.authenticate(params[:session][:password]) 
      log_in user
      redirect_to user
    else
      flash.now[:danger] = 'Invalid email/password combination'
      render 'new' 
    end
  end

  def destroy
    log_out
    redirect_to root_url
  end
end

app/helpers/session_helper

module SessionsHelper
  def log_in(user) 
    session[:user_id] = user.id
  end 

  def current_user
    @current_user ||= User.find_by(id: session[:user_id])
  end

  def logged_in?
    !current_user.nil?
  end

  def log_out
    session.delete(:user_id)
    @current_user = nil
  end
end

请前辈们解惑！

为何调试信息总是显示 permitted: false 啊？

ChileNeverDie — Tue, 07 Jan 2020 00:36:24 +0800

目前在跟着 ROR Tutorial 做（在做 6.0 的项目，但是教材目前只有 Rails 5 的），7.1.1 那里，不管我是什么操作，调试信息总是显示 permitted: false，总觉得哪里不对，有没有哪位前辈能解个惑？谢谢！