CharlesZCB (Charles Zhang)

Rails 启动报错的原因？

CharlesZCB — Fri, 11 Nov 2022 10:07:26 +0800

rails s 启动出现报错如下：这是什么问题？？

ruby 版本 ruby 2.7.3p183 (2021-04-05 revision 6847ee089d) [x64-mingw32]

warning: Win32API is deprecated after Ruby 1.9.1; use fiddle directly instead
Traceback (most recent call last):
        23: from bin/rails:9:in `<main>'
        22: from bin/rails:9:in `require'
        21: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/railties-5.1.7/lib/rails/commands.rb:16:in `<top (required)>'
        20: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/railties-5.1.7/lib/rails/command.rb:44:in `invoke'
        19: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/railties-5.1.7/lib/rails/command/base.rb:63:in `perform'
        18: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/thor-1.1.0/lib/thor.rb:392:in `dispatch'
        17: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/thor-1.1.0/lib/thor/invocation.rb:127:in `invoke_command'
        16: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/thor-1.1.0/lib/thor/command.rb:27:in `run'
        15: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/railties-5.1.7/lib/rails/commands/server/server_command.rb:130:in `perform'
        14: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/railties-5.1.7/lib/rails/commands/server/server_command.rb:130:in `tap'
        13: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/railties-5.1.7/lib/rails/commands/server/server_command.rb:133:in `block in perform'
        12: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/railties-5.1.7/lib/rails/commands/server/server_command.rb:133:in `require'
        11: from F:/develop/project/VS/jiankong/stea/config/application.rb:5:in `<top (required)>'
        10: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/bundler-1.17.2/lib/bundler.rb:114:in `require'
         9: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/bundler-1.17.2/lib/bundler/runtime.rb:65:in `require'
         8: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/bundler-1.17.2/lib/bundler/runtime.rb:65:in `each'
         7: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/bundler-1.17.2/lib/bundler/runtime.rb:76:in `block in require'
         6: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/bundler-1.17.2/lib/bundler/runtime.rb:76:in `each'
         5: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/bundler-1.17.2/lib/bundler/runtime.rb:81:in `block (2 levels) in require'
         4: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/bundler-1.17.2/lib/bundler/runtime.rb:81:in `require'
         3: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/mysql2-0.4.10-x64-mingw32/lib/mysql2.rb:31:in `<top (required)>'
         2: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/mysql2-0.4.10-x64-mingw32/lib/mysql2.rb:31:in `require'
         1: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/mysql2-0.4.10-x64-mingw32/lib/mysql2/mysql2.rb:2:in `<top (required)>'
F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/mysql2-0.4.10-x64-mingw32/lib/mysql2/mysql2.rb:2:in `require': cannot load such file -- mysql2/2.7/mysql2 (LoadError)

RubyMine windows 安装 Ruby Rails 启动出问题

CharlesZCB — Thu, 10 Nov 2022 15:40:43 +0800

ruby -v
ruby 2.1.5p273 (2014-11-13 revision 48405) [i386-mingw32]

rails -v
Fetching source index from http://gems.ruby-china.com/
Resolving dependencies...
Could not verify the SSL certificate for
https://gems.ruby-china.com/quick/Marshal.4.8/unf-0.1.4-java.gemspec.rz.
There is a chance you are experiencing a man-in-the-middle attack, but most
likely your system doesn't have the CA certificates needed for verification. For
information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without
using SSL, edit your Gemfile sources and change 'https' to 'http'.

这个在 Window 下 ssl 的问题，如何处理？？？

RubyMine 在 Ubuntu 下启动失败

CharlesZCB — Thu, 10 Nov 2022 11:26:24 +0800

sh RubyMine.sh 报错 jdk 问题？但是明明我装的就是 jdk8 啊。。。。。请问哪位大神解释下

如何按照创建时间降序排列再按照 system_id 去重？？

CharlesZCB — Thu, 27 Sep 2018 14:43:47 +0800

FalseFeedback.order("created_at desc").group("system_id")

这句话最后是去重了但是没有按照降序排列请问怎么修改

(第一列是id   第三列是system_id  第五列是ceated_at)
48      2  1    1   2018-09-27 15:39:26 1   22                          2018-09-27 15:39:26 22      
47      1   1   1   2018-09-27 14:39:55 1   huhu                            2018-09-27 14:39:55 huhu        
46      1   1   1   2018-09-27 13:58:36 1   333                         2018-09-27 13:58:36 33      
45      1   1   1   2018-09-27 13:31:13 1   we                          2018-09-27 13:31:13 we      
44      1   2   1   2018-09-27 13:24:22 1   111                 13      2018-09-27 13:24:22 1111    1   2018-09-27 14:49:48
43      2   2   1   2018-09-27 13:21:41 1   32                          2018-09-27 13:21:41 22      
42      2   2   1   2018-09-27 13:20:10 1   44                          2018-09-27 13:20:10 44      
41      1   3   1   2018-09-27 13:18:10 1   11                          2018-09-27 13:18:10 1       
40      2   1   1   2018-09-27 13:17:49 1   2                           2018-09-27 13:17:49 2       
39      1   2   1   2018-09-27 13:17:26 1   1                           2018-09-27 13:17:26 1       

现在的语句只能查到  39  40 的数据
我现在想查到 48 和44的

undefined method `each' for nil:NilClass？这是在我提交数据的时候出的问题具体情况如下

CharlesZCB — Sun, 23 Sep 2018 21:42:35 +0800

customer 代码：

class Customer < ApplicationRecord
  validates :sex, :username, :age ,:telephone,presence: true
  has_many :orderinfos, dependent: :destroy
end

orderinfo 代码如下：

class Orderinfo < ApplicationRecord
  validates :cus_id, :foo_id, :number, presence: true
  belongs_to :customer
end

出错代码如下部分（form 部分）：

<div class="field">
    <%= form.select(:cus_id) do %>
      <% @customers.each do |c| -%>   #这是在OrderInf 的显示页面   显示这里的each有问题  ：undefined method `each' for nil:NilClass
        <%= content_tag(:option, c.username, value: c.id) %>
      <% end %>
    <% end %><br>
  </div>


controller部分
def create
    @orderinfo = Orderinfo.new(orderinfo_params)
    respond_to do |format|
      if @orderinfo.save    #指示这里错误并且回滚
        format.html { redirect_to @orderinfo, notice: 'Orderinfo was successfully created.' }
        format.json { render :show, status: :created, location: @orderinfo }
      else
        format.html { render :new }
        format.json { render json: @orderinfo.errors, status: :unprocessable_entity }
      end
    end
  end

提交页面如下：

<h1>New Orderinfo</h1>
<%= render 'form', orderinfo: @orderinfo  %>
<%= link_to 'Back', orderinfos_path %>

求问大神请问怎么解决？

请问我这里配置了两个类的关系但是在调用的时候却没有显示出我喜爱嗯要得结果，具体情况如下：

CharlesZCB — Sun, 23 Sep 2018 14:09:54 +0800

user 类：

class Delta::User < ActiveRecord::Base
  has_many :orders, dependent: :destroy

order 类：

class Delta::Order < ActiveRecord::Base
  belongs_to :user
  has_one "product"

测试数据：

user1=Delta::User.new
user1.id=1
user1.username="tom"


p1=Delta::Product.new
p1.price=100
p1.id=1

p2=Delta::Product.new
p2.price=200
p2.id=2

order1=Delta::Order.new
order1.user_id=1
order1.product_id=2
order1.num=2

puts "==="
puts Delta::Order.vip_total_consumption

vip_total_consumption 代码如下：

def self.vip_total_consumption
    total = 0.0
    Delta::User.where(username: 'tom').each do |us|
      puts us.orders.length
      us.orders.each do |order|
        total += order.num*order.product.price
      end
    end
    return total
  end

但是 puts us.orders.length 这句话没有打印出数量 1 而是 0 请问哪里的问题？？？

Ruby Rails 怎么执行 script 中的 rb 文件？并且让其中的数据插入到数据库？执行命令是什么？

CharlesZCB — Sat, 22 Sep 2018 20:02:00 +0800

例如 script 文件下有个 useradd.rb 代码： user = Delta::User.new user.username = "Ruby " user.sex = 1 user.save 执行什么语句让他插入到数据库？

CharlesZCB (Charles Zhang)

Rails 启动报错的原因？

RubyMine windows 安装 Ruby Rails 启动出问题

RubyMine 在 Ubuntu 下启动失败

如何按照创建时间降序排列 再按照 system_id 去重？？

undefined method `each' for nil:NilClass？这是在我提交数据的时候出的问题 具体情况如下

请问 我这里配置了两个类的关系 但是在调用的时候 却没有显示出我喜爱嗯要得结果，具体情况如下：

Ruby Rails 怎么执行 script 中的 rb 文件？并且让其中的数据插入到数据库？ 执行命令是什么？

如何按照创建时间降序排列再按照 system_id 去重？？

undefined method `each' for nil:NilClass？这是在我提交数据的时候出的问题具体情况如下

请问我这里配置了两个类的关系但是在调用的时候却没有显示出我喜爱嗯要得结果，具体情况如下：

Ruby Rails 怎么执行 script 中的 rb 文件？并且让其中的数据插入到数据库？执行命令是什么？