我有三个模型 - User
,Client
,Topic
。
用户
has_many :clients
has_many :topics, :through => :clients, :uniq => true
客户端
has_and_belongs_to_many :topics
主题
has_and_belongs_to_many :clients
我要做的是在我的客户的edit
视图中,更改此客户的主题。
这是我的客户端控制器的更新操作:
def update
if params[:topic_ids]
@client = current_user.clients.find(params[:id])
@client.topic_ids = params[:client][:topic_ids]
@client.save
else
@client = current_user.clients.find(params[:id])
end
respond_to do |format|
if @client.update_attributes(params[:client])
format.html { redirect_to @client, notice: 'Client was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: @client.errors, status: :unprocessable_entity }
end
end
end
这就是日志的样子:
Started PUT "/clients/6" for 127.0.0.1 at 2012-10-07 18:56:14 -0500
Processing by ClientsController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"J172mxxCX0OdxcGm4GSPv8=", "client"=>{"name"=>"Testeeee Johnson", "email"=>"testeee@johnson.com", "phone"=>"4320981234", "firm_id"=>"1", "personal_priority"=>"1", "last_contact"=>"2012-06-08", "vote"=>"1", "vote_for_user"=>"0", "next_vote"=>"2012-10-10", "vote_ii"=>"0", "vote_ii_for_us"=>"0"}, "topic_ids"=>["2"], "commit"=>"Update Client", "id"=>"6"}
User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1
Client Load (0.1ms) SELECT "clients".* FROM "clients" WHERE "clients"."user_id" = 1 AND "clients"."id" = ? LIMIT 1 [["id", "6"]]
Topic Load (0.2ms) SELECT "topics".* FROM "topics" INNER JOIN "clients_topics" ON "topics"."id" = "clients_topics"."topic_id" WHERE "clients_topics"."client_id" = 6
(0.1ms) begin transaction
(0.0ms) commit transaction
(0.0ms) begin transaction
(0.0ms) commit transaction
(0.0ms) begin transaction
(0.0ms) commit transaction
Redirected to http://localhost:3000/clients/6
Completed 302 Found in 8ms (ActiveRecord: 0.8ms)
毋庸置疑,它不会更新client.topics
的记录。
如何更新客户记录的topics
属性?
修改1
_form
部分看起来是这样的:
<%= form_for(@client) do |f| %>
<% if @client.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@client.errors.count, "error") %> prohibited this client from being saved:</h2>
<ul>
<% @client.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :email %><br />
<%= f.text_field :email %>
</div>
<div class="field">
<%= f.label :firm %><br />
<%= f.select :firm_id, Firm.all.collect { |firm| [firm.name, firm.id] }, {:include_blank => 'None'} %>
</div>
<div class="field">
<h4>Topics</h4>
<% Topic.all.each do |topic| %>
<% checked = @client.topics.include?(topic) %>
<%= f.label(:name, topic.name) %> <%= check_box_tag "topic_ids[]", topic.id, checked %>
<% end %>
</div>
.
. - reduced for brevity
.
<br /><br />
<div class="actions">
<%= f.submit %>
</div>
<% end %>
答案 0 :(得分:0)
无论出于何种原因,form
帮助程序都无法与check_box
一起使用。
所以,这是有效的代码:
<%= check_box_tag "client[topic_ids][]", topic.id, checked %>
根据other answers的类似问题,帮助器f.check_box
是模型绑定的,并且提供给复选框的值是隐含在表单上的模型中的。问题是,我无法弄清楚如何获取form_helper的隐含值来生成正确的标记 - 即client[topic_ids][]
,所以我不得不诉诸check_box_tag
。
答案 1 :(得分:-1)
您在下面的评论中提到,您还想为每个主题添加权重。 has_and_belongs_to_many关联不再支持此功能,因此您应该使用has_many:through association:
class User < ActiveRecord::Base
has_many :clients
end
class Clients < ActiveRecord::Base
belongs_to :user
has_many :client_topics
has_many :topics, :through => :clients_topics
end
# Create this table like any other, with a "weight" field
class ClientsTopics < ActiveRecord::Base
belongs_to :client
belongs_to :topic
end
class Topics < ActiveRecord::Base
has_many :clients_topics
has_many :clients, :through => :clients_topics
end
现在您的更新需要删除所有现有的clients_topics,然后循环传递的topic_ids和权重,并将它们添加到客户端,如下所示:
def update
if params[:topic_ids]
@client = current_user.clients.find(params[:id])
@client.clients_topics.delete_all
params[:client][:topic_ids].each_with_index do |topic_id, index|
weight = params[:client][:weights][index]
@client.clients_topics.create!(:topic_id => topic_id, :weight => weight)
end
else
@client = current_user.clients.find(params[:id])
end
(etc...)
end