Question

我多年来一直在努力解决这个问题，似乎没有任何相关问题有用。我试图通过隐藏字段收集用户的IP，然后将其显示在适用的消息上。当我尝试实现它时，我在表单页面上收到以下错误。我不确定是否由于更新表或什么问题，但是当我运行Message.all 时，ip值不会出现这是相关的代码：运行Messages.all时的控制台：

irb(main):002:0> Message.all
  Message Load (2.6ms)  SELECT "messages".* FROM "messages"
=> #<ActiveRecord::Relation [#<Message id: 30, subject: "Pears", content: "Pears", post_time: nil, created_at: "2015-07-02 19:49:32", updated_at: "2015-07-02 19:49:32">, #<Message id: 31, subject: "Pears", content: "Pears\r\n", post_time: nil, created_at: "2015-07-14 17:49:12", updated_at: "2015-07-14 17:49:12">, #<Message id: 32, subject: "Hi", content: "Muffin", post_time: nil, created_at: "2015-07-14 17:52:23", updated_at: "2015-07-14 17:52:23">]>
irb(main):003:0>

消息模型的迁移文件：

class CreateMessages < ActiveRecord::Migration
  def change
    create_table :messages do |t|
      t.string :subject
      t.string :content
      t.string :ip
      t.date :post_time

      t.timestamps null: false
    end
  end
end

消息控制器：

class MessagesController < ApplicationController
    def index
        @messages=Message.all
    end
    def new
        @messages=Message.new
    end
    def show
        @message=Message.find(params[:id])
    end
    def destroy
        @messages=Message.find(params[:id])
        @messages.destroy
        redirect_to '/'
    end
    def create
        @messages = Message.new(message_params) 
            if @messages.save 
            redirect_to '/' 
                else 
            render 'new' 
            end
    end
    private
    def message_params
        params.require(:message).permit(:content, :subject, :id, :ip)
    end

end

提交消息视图：

<div class="formWrapper">
    <%=form_for Message.new do |t|%>
    <div class ="Inputs">
        <div class="row">

        <div class="input-field col s6">
        <%=t.text_field :subject, :class => "validate", :length => '25', :placeholder => 'Subject'%><br>
        <%=t.text_area :content, :class => "materialize-textarea", :placeholder => "Message"%>
        <%=t.hidden_field :ip, :value => request.remote_ip %>
        <div class="g-recaptcha" data-sitekey=""></div>
        </div>
        </div>

        <div class="submit">
            <%=t.submit "Submit", :class => "btn"%>

        </div>

        <%end%>
    </div>
</div>

索引页面（显示消息的位置）：

<div class="main">

        <%@messages.each do |t|%>
        <div class="cWrap">
        <div class="col s12 m6">
        <div class="card blue-grey darken-1">
        <div class="card-content white-text">
        <span class="card-title"><%=link_to t.subject, show_path(t)%></span>
        <div class="divider"></div>
        <p><%=t.content%></p>
        <p><%=t.ip%></p>
        </div>
            <div class="card-action">
                <%=link_to "Delete Message", delete_path(t), :method => 'delete'%>
            </div>

        </div>
        </div>
    </div>
    <% end %>
</div>

Answer 1

首先，这是一个非常糟糕的主意，每个人都可以直接在表单中更改IP（例如通过chrome dev工具）...最好在控制器中保存消息之前设置ip：

@message = Message.new(message_params)
@message.ip = request.remote_ip
@message.save

接下来，如果你看一下控制台

irb(main):002:0> Message.all
  Message Load (2.6ms)  SELECT "messages".* FROM "messages"
=> #<ActiveRecord::Relation [#<Message id: 30, subject: "Pears", content: "Pears", post_time: nil, created_at: "2015-07-02 19:49:32", updated_at: "2015-07-02 19:49:32">, #<Message id: 31, subject: "Pears", content: "Pears\r\n", post_time: nil, created_at: "2015-07-14 17:49:12", updated_at: "2015-07-14 17:49:12">, #<Message id: 32, subject: "Hi", content: "Muffin", post_time: nil, created_at: "2015-07-14 17:52:23", updated_at: "2015-07-14 17:52:23">]>
irb(main):003:0>

对象消息没有 ip 属性！您似乎将 ip 字段添加到已应用的迁移中，请再次回滚和迁移（以创建消息表）或删除 t.string：ip 并创建新的迁移到只需将ip添加到消息表：

def change
  add_column :messages, :ip, :string
end

Answer 2

irb(main):002:0> Message.all 
Message Load (2.6ms)  SELECT "messages".* FROM "messages"
=> #<ActiveRecord::Relation [#<Message id: 30, subject: "Pears", content: "Pears", post_time: nil, created_at: "2015-07-02 19:49:32", updated_at: "2015-07-02 19:49:32">, #<Message id: 31, subject: "Pears", content: "Pears\r\n", post_time: nil, created_at: "2015-07-14 17:49:12", updated_at: "2015-07-14 17:49:12">, #<Message id: 32, subject: "Hi", content: "Muffin", post_time: nil, created_at: "2015-07-14 17:52:23", updated_at: "2015-07-14 17:52:23">]> irb(main):003:0>

正如我所看到的，您的任何消息中都没有ip属性。我猜您稍后会在迁移文件中添加该字段，并忘记迁移。

在RoR中将用户IP记录到DB

2 个答案: