Question

我有一个模型客户端，具有单表继承。但是当我尝试提交表单时，类型字段不会保存在数据库中。如何强制它保存类型，然后在index.html.erb上显示帐户类型。

模型/ client.rb

class Client < ActiveRecord::Base

end

class Suscriber < Client

end

class NonSuscriber < Client

end

视图/ _form.html.erb

    <%= simple_form_for @client do |f| %>

      <%= f.input :name %>
      <%=f.input :type %>

      <%= f.button :submit %>   


<% end %>

clients_controller.rb

def index
  @clients = Client.where(:type => params[:type])
    respond_to do |format|
      format.html
      format.json {render json: @clients}
    end
end 


 def new
   @client = Client.new 

      respond_to do |format|
      format.html # new.html.erb
      format.json { render :json => @client }
    end
end

def create
    @client = Client.new(params[:client])

    respond_to do |format|
      if @client.save
        format.html { redirect_to @clinet, :notice => 'Client was successfully created.' }
        format.json { render :json => @client, :status => :created, :location => @client }
      else
        format.html { render :action => "new" }
        format.json { render :json => @client.errors, :status => :unprocessable_entity }
      end
    end
  end

我在轨道3.1

Answer 1

docs说：

“Active Record允许通过将类的名称存储在默认名为”type“的列中来继承（可以通过覆盖Base.inheritance_column来更改）。”

正如文档中所述，您需要使用set_inheritance_column，请查看http://apidock.com/rails/v3.1.0/ActiveRecord/Base/set_inheritance_column/class

class Client < ActiveRecord::Base
  set_inheritance_column do
    original_inheritance_column + "_id" # replace original_inheritance_column with "type" 
  end
end

HTH

为什么rails不会在单表继承中保存类型字段

1 个答案: