Rails 3 - 创建复选框(与 _destroy 相对) [英] Rails 3 - checkbox for create (opposite of _destroy)

问题描述

我有一个与输出字段具有 has_many 关系的查询模型.在我的查询控制器的新函数中，我在查询实例中构建了几个输出字段.在我的表单中，我希望每个复选框都确定是否保存了对象(检查意味着将这个 OutputField 实例保存到数据库中).我怎样才能做到这一点?

我的模型:

类查询:破坏accepts_nested_attributes_for :output_fields结尾类输出字段

我的查询控制器的相关部分.结构是另一种模式.

 # GET/queries/new# GET/queries/new.json定义新@query = Query.newStructure.columns.each 做 |column|@query.output_fields.build( :table_name => Structure.table_name, :column_name => column.name )结尾response_to do |格式|format.html # new.html.erbformat.json { 渲染:json =>@询问 }结尾结尾

最后说说我的看法.现在我正在将复选框链接到 destroy 属性，我认为这与我想要的完全相反.

<%= form_for(@query) do |f|％＞<%= f.fields_for :output_fields 做 |builder|％＞<div class="field"><%= builder.check_box :_destroy %><%= builder.label :_destroy, builder.object.column_name %>

<%结束%><div class="actions"><%= f.submit %>

<%结束%>

如果不明显，我正在尝试为简单的查询构建器生成用户界面.这是我的第一个 rails 应用程序，因此感谢您提供任何建议.

解决方案

默认情况下，check_box 表单助手的值是将 checked_value 设置为1"，将 unchecked_value 设置为0".因此，要反转销毁复选框的行为，只需切换这些值即可.

<%= builder.check_box :_destroy, {}, '0', '1' %>

I have a Query model with a has_many relationship to OutputFields. In my query controller's new function I build several OutputFields within the query instance. In my form, I want each checkbox to determine whether the object is saved (a check means save this instance of OutputField to the database). How can I do this?

my models:

class Query < ActiveRecord::Base
  attr_accessible :description, :name

  has_many :output_fields, :dependent => :destroy
  accepts_nested_attributes_for :output_fields
end

class OutputField < ActiveRecord::Base
  attr_accessible :query_id, :column_name, :table_name

  belongs_to :query
end

relevant sections of my queries controller. Structure is another model.

  # GET /queries/new
  # GET /queries/new.json
  def new
    @query = Query.new
    Structure.columns.each do |column|
      @query.output_fields.build( :table_name => Structure.table_name, :column_name => column.name )
    end

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

Finally, my view. Right now I'm linking the checkbox to the destroy attribute, which I think will do the exact opposite of what I want.

<%= form_for(@query) do |f| %>
  <%= f.fields_for :output_fields do |builder| %>
    <div class="field">
      <%= builder.check_box :_destroy %>
      <%= builder.label :_destroy, builder.object.column_name %>
    </div>
  <% end %>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

If it's not obvious, I'm trying generate a user interface for a simple query builder. This is my first rails app, so any advice is appreciated.

解决方案

By default the value of the check_box form helper is to set the checked_value to '1' and the unchecked_value to '0'. So to reverse the behaviour of the destroy checkbox, just switch these values around.

<%= builder.check_box :_destroy, {}, '0', '1' %>

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