Question

我想创建属性。然后将其添加到许多列表中。一个属性可以列在许多列表中。

这是我的模特：

class List < ActiveRecord::Base
  has_many :propertyships
  has_many :properties, :through => :propertyships
end

class Propertyship < ActiveRecord::Base
  belongs_to :list
  belongs_to :property
end

class Property < ActiveRecord::Base
  has_many :propertyships
  has_many :lists, :through => :propertyships
end

属性/ show.html.erb

<%= form_for @property do |f| %>
    <% List.all.each do |list| %>
        <%= check_box_tag "property[list_ids][]", list.id,@property.list_ids.include?(list.id) %>
        <%= list.name %>
    <% end %>
    <%= f.submit %>
<% end %>

属性不会添加到列表中。我做错了什么？

Answer 1

使用collection_check_boxes代替手动创建输入：

<%= form_for @property do |f| %>
    <%= f.collection_check_boxes(:list_ids, List.all, :id, :name) %>
    <%= f.submit %>
<% end %>

将params列入白名单有点特殊，因为params[:property][:list_ids]将包含一个数组：

class PropertiesController < ApplicationController

  # ...

  def create
    @property = Property.new(property_params)
    # ...
  end

  # ...

  private

    def property_params
       params.require(:property)
             .permit(:foo, :bar, list_ids: [])
    end
end

将属性添加到许多列表rails4

1 个答案: