sandwind (Jack.Peng)

关于多次查询排序输出结果的问题

sandwind — Mon, 20 Jul 2015 11:06:59 +0800

首先在 model 中定义类方法进行查询

class Post < ActiveRecord::Base
  belongs_to :user
  has_many  :photos
  # belongs_to :sub
  accepts_nested_attributes_for :photos, allow_destroy: true

  def self.main(main)
    where(main: main)
  end

  def self.sub(sub)
   where(sub: sub)
  end

  def self.create_before(date)
    where("created_at < ?", date)
  end 

  def self.create_after(date)
    where("created_at > ?", date)
  end
end

要查询的是在以时间为比较查询这个时间之前（后）各 N 条数据，并以降序的顺序来返回 json 数组，接口中调用如下：

resource :posts do 
   desc 'post_list'
   params do
      requires :access_token, :type => String, :desc => "token"
      requires :main,   :type => String, :desc => "main"
      requires :sub,    :type => String, :desc => "sub"
      requires :date,   :type => DateTime, :desc => "date"
      requires :count,  :type => Integer, :desc => "count"
   end

   post 'posts_lists' do

       if Post.count == 0
         error!({status: false, :errors => ["posts count is zero"] }, 201) 
       end

       begin
         if params[:count] > 0
            posts = Post.main(params[:main]).sub(params[:sub]).create_after(params[:date]).limit(params[:count])
         else
           posts = Post.main(params[:main]).sub(params[:sub]).create_before(params[:date]).order(created_at: :desc).limit(params[:count].abs)
         end

         status(201)
         {
           status: true, 
           errors:[],
           posts: posts.select(:id,:title,:created_at,:previewurl,:replycnt,:upcount,:downcount)
         } 
       rescue ActiveRecord::RecordNotFound 
         error!({status: false, :errors => ["not find posts"] }, 201) 
       end 
   end

发现问题这里当当我查询查询

posts = Post.main(params[:main]).sub(params[:sub]).create_after(params[:date]).limit(params[:count])

当 count > 0 查询结果是出来是以按照升序的方式排列但是当我把查询结果以降序排序：

{
  "posts": [
    {
      "id": 21,
      "title": "Sed excepturi explicabo fugit est sapiente culpa alias iusto.",
      "created_at": "2015-07-19T11:38:38.000Z",
      "previewurl": "http://filestorageapp.b0.upaiyun.com/uploads/user_profile/avatar/3/normal_avatar.jpg",
      "upcount": 20,
      "downcount": 20,
      "replycnt": 20
    },
    {
      "id": 22,
      "title": "Quibusdam modi impedit veniam rem quisquam consectetur odit aut.",
      "created_at": "2015-07-19T11:39:38.000Z",
      "previewurl": "http://filestorageapp.b0.upaiyun.com/uploads/user_profile/avatar/3/normal_avatar.jpg",
      "upcount": 21,
      "downcount": 21,
      "replycnt": 21
    },
    {
      "id": 23,
      "title": "Fuga consequuntur reiciendis unde vero quidem non inventore.",
      "created_at": "2015-07-19T11:40:38.000Z",
      "previewurl": "http://filestorageapp.b0.upaiyun.com/uploads/user_profile/avatar/3/normal_avatar.jpg",
      "upcount": 22,
      "downcount": 22,
      "replycnt": 22
    },
    {
      "id": 24,
      "title": "Eius earum ipsum harum et rerum et officia totam.",
      "created_at": "2015-07-19T11:41:38.000Z",
      "previewurl": "http://filestorageapp.b0.upaiyun.com/uploads/user_profile/avatar/3/normal_avatar.jpg",
      "upcount": 23,
      "downcount": 23,
      "replycnt": 23
    },
    {
      "id": 25,
      "title": "Et deleniti voluptas quo inventore maiores.",
      "created_at": "2015-07-19T11:42:38.000Z",
      "previewurl": "http://filestorageapp.b0.upaiyun.com/uploads/user_profile/avatar/3/normal_avatar.jpg",
      "upcount": 24,
      "downcount": 24,
      "replycnt": 24
    }
  ]
}

posts = Post.main(params[:main]).sub(params[:sub]).create_after(params[:date]).limit(params[:count]).order(created_at: :desc)

输出结果则是从整张表最上面查找出来结果进行排序，这个结果就完全跟之前查询目的不一样，而是排序后再进行时间比较过后的查询结果结果如下：

{
  "status": true,
  "errors": [],
  "posts": [
    {
      "id": 100,
      "title": "Enim repudiandae sed quaerat dolorum soluta pariatur eum velit cupiditate.",
      "created_at": "2015-07-19T12:57:38.000Z",
      "previewurl": "http://filestorageapp.b0.upaiyun.com/uploads/user_profile/avatar/3/normal_avatar.jpg",
      "upcount": 99,
      "downcount": 99,
      "replycnt": 99
    },
    {
      "id": 99,
      "title": "Eum aut eius repellat mollitia ullam rerum perspiciatis veritatis doloremque.",
      "created_at": "2015-07-19T12:56:38.000Z",
      "previewurl": "http://filestorageapp.b0.upaiyun.com/uploads/user_profile/avatar/3/normal_avatar.jpg",
      "upcount": 98,
      "downcount": 98,
      "replycnt": 98
    },
    {
      "id": 98,
      "title": "Molestias fugiat fugit incidunt doloribus.",
      "created_at": "2015-07-19T12:55:38.000Z",
      "previewurl": "http://filestorageapp.b0.upaiyun.com/uploads/user_profile/avatar/3/normal_avatar.jpg",
      "upcount": 97,
      "downcount": 97,
      "replycnt": 97
    },
    {
      "id": 97,
      "title": "Maxime maiores voluptatum deleniti assumenda aut dicta.",
      "created_at": "2015-07-19T12:54:38.000Z",
      "previewurl": "http://filestorageapp.b0.upaiyun.com/uploads/user_profile/avatar/3/normal_avatar.jpg",
      "upcount": 96,
      "downcount": 96,
      "replycnt": 96
    },
    {
      "id": 96,
      "title": "Sint autem nemo facere ad odit quidem ullam voluptatem.",
      "created_at": "2015-07-19T12:53:38.000Z",
      "previewurl": "http://filestorageapp.b0.upaiyun.com/uploads/user_profile/avatar/3/normal_avatar.jpg",
      "upcount": 95,
      "downcount": 95,
      "replycnt": 95
    }
  ]
}

我不知道有什么排序接口不影响最后查询结果来进行排序求大神指点迷津

在使用 image_tag 上有出现的问题，求指教，求指点

sandwind — Wed, 15 Jul 2015 11:31:49 +0800

1.首先我实现了图片上传，上传到又拍云得到的 2.如下代码去获取图片的 url

@profile.avatar.url(:normal)

3.在 erb 模板中的使用如下代码去使用图片显示

<%= image_tag(@profile.avatar.url(:normal),class:"232323")%>

但是出现以下很奇怪的现象希望大神里指点迷经

这里从 html 代码上看发现前面始终要加上/images/ 导致我不能显示出图片

undefined method `fetch_value' 问题

sandwind — Sun, 12 Jul 2015 15:59:41 +0800

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable

  attr_accessor:login
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  has_one :user_profile ,dependent: :destroy #定义user与user_profile的一对一对关系

  ACCESSABLE_ATTRS = [:userid, :email, :telno, :current_password, :password, :password_confirmation]

  # VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  # validates :email, presence: true, length: { maximum: 255 },format: { with: VALID_EMAIL_REGEX },uniqueness: { case_sensitive: false }
  # validates :userid,presence: true, length: { maximum: 255 },uniqueness: { case_sensitive: false }
  # validates :telno,presence:  true, length: { maximum: 14 }, uniqueness: true
  before_save :ensure_authentication_token!


  def self.find_for_database_authentication(warden_conditions)
    conditions = warden_conditions.dup
    if login = conditions.delete(:login)
      where(conditions.to_h).where(["lower(userid) = :value OR lower(email) = :value OR lower(telno) = :value", { :value => login.downcase }]).first
    else
      where(conditions.to_h).first
    end
  end
end

然后就是 user_profile

class UserProfile < ActiveRecord::Base
  SEXTPYE = %w{男 女}
  POSITION= %w{学生 辅导员  科目教师}

  # validates :name,presence:  true, length: { maximum: 80 }, uniqueness: true

  mount_uploader :avatar, AvatarUploader

  belongs_to  :user  

end

在判断 current_user 不为空的条件下用户完善子的 userprofile 调用 UserprofilesController 的 new 方法结果出现这个错误这是我 userprofilescontroller 代码：

class UserProfilesController < ApplicationController
  before_filter :authenticate_user!,only: [:show, :create, :edit, :update]

  def show
    @profile = UserProfile.find(params[:id])
  end

  def update
    @profile = UserProfile.find(params[:id])
    respond_to do |format|
      if @profile.update_attributes(profile_params)
        format.html { redirect_to root_path, notice: '已更新个人用户信息.' }
        format.json { render :show, status: :ok, location: @profile }
      else
        format.html { render :edit }
        format.json { render json: @profile.errors, status: :unprocessable_entity }
      end
    end
  end

  def new
    @profile = UserProfile.new
  end

  def edit
    @profile = current_user.user_profile
  end

  def create
    @profile = current_user.build_user_profile(profile_params)
    if @profile.save
     flash[:success] = "用户信息已更新"
     redirect_to root_path
    else
     render 'edit'
    end 
  end

  def destroy
    @profile.destroy
    rediret_to current_user
  end

  private
   def profile_params
     params.require(:user_profile).permit(:name,:sexuality,:age,:bloodtype,:class,:nickname,:mark,:position,:birthday,:avatar)
   end
end

关于代码长度过长想换行怎么做

sandwind — Sat, 11 Jul 2015 17:50:04 +0800

@user = User.new(email: params[:user][:email],telno: params[:user][:telno],password: params[:user][:password],userid: params[:user][:userid],school: params[:user][:school],profession: params[:user][:profession]) 比如这个很长我想美观让代码换行怎么做

关于 model 上操作的问题

sandwind — Mon, 06 Jul 2015 20:11:00 +0800

遇到一个 has_one 调用的问题我在 model 中定义了 userprofile 的归属 user 之间是 has_one 的关系然后我在主页上只要用户已登录就显示当前用户的个人信息

是不是我哪没理解对了呢？

关于用 grape 构建用户注册的 api 时关于用户名密码以明文传输的问题

sandwind — Thu, 02 Jul 2015 10:29:03 +0800

有什么安全措施能在注册时更加安全呢？

求大神指点迷津

sandwind — Sat, 27 Jun 2015 13:38:51 +0800

我用 devise，mongoid 搭建了登录注册

然后我用 userscontroller 来设置 user 其他属性

如下代码是 user 的 model 在最后 birthday 为用户生日

让后我在 userscontroller 中设置 strong param:

然后我测试，注册用户，登录都没问题但是当我调用 userscontroller 方法更新用户资料的时候页面报错

百度，google 搜索下是我属性是一个 hash 值但是设置了还是有问题求大神指点迷津

关于 puma 部署出现问题求大神们给点帮助

sandwind — Wed, 03 Jun 2015 11:23:43 +0800

我先按照这个教程 http://nicolas-brousse.github.io/ubuntu-install-and-tips/pages/installation/rails-puma/ 进行部署一切都很顺利启动了 ngnix 当到最后一步，

start railsapp 发现访问我部署的地址出现的便是

我查看了 nginx 的 errer.log 里面记录： 2015/06/02 08:49:33 [error] 6695#0: *1 connect() to unix:///home/sprouting/Projects/testapi/tmp/sockets/puma.sock failed (111: Connection refused) while connecting to upstream, client: 192.168.199.194

但是我回到我项目目录输入 foreman start 访问部署的地址网站又正常运行

我就想知道我是哪配置出问题了