fields_for 用于使用数组的 has_many 关联 [英] fields_for for has_many association using an array

问题描述

控制器: project_sub_types_controller.rb

  def new
    @svn_repos = ['svn_software','svn_hardware']
    @project_sub_type = ProjectSubType.new
    @project_sub_type.repositories.build
  end

模型:project_sub_type.rb

class ProjectSubType < ActiveRecord::Base
  belongs_to :project_type
  has_many :repositories, :dependent => :destroy
  accepts_nested_attributes_for :repositories

  def repositories_attributes=(attributes)
    # Process the attributes hash
  end
end

查看:_form.html.erb

<%= form_for @project_sub_type, :html => {:class => 'project_subtype_form'} do |f| %>
  <%= f.label :name, "Project sub type name" %>
  <%= f.text_field :name %>
  <%= f.fields_for :repositories do |ff| %>
      <%= ff.label :select_svn_repositories, "Select SVN repositories" %> 
      <% @svn_repos.each do |repos| %>
          <%= ff.check_box :repos_name, {}, "#{repos}", nil %>
          <%= h repos -%>
      <% end %>
<%= f.submit "Save"%>

fields_form 检查元素:

<input id="project_sub_type_repositories_attributes_0_repos_name" type="checkbox" value="svn_software" name="project_sub_type[repositories_attributes][0][repos_name]">
svn_software
<input id="project_sub_type_repositories_attributes_0_repos_name" type="checkbox" value="svn_hardware" name="project_sub_type[repositories_attributes][0][repos_name]">
svn_hardware 

提交表单后 params = "repositories_attributes"=>{"0"=>{"repos_name"=>"svn_hardware"}}} 即使选中了两个复选框正在使用最后选择的复选框，即svn_hardware"

After submitting the form the params = "repositories_attributes"=>{"0"=>{"repos_name"=>"svn_hardware"}}} even after checking both the checkboxes it is using the last selected check_box that is 'svn_hardware'

所需的输出:我的最终输出应该是用户选择的，所以在这种情况下，它应该是我提交后的参数 = "repositories_attributes"=>{"0"=>{"repos_name"=>"svn_software"}{"1"=>​​{"repos_name"=>"svn_hardware"}}

Desired Output : My final output should be what the user selects so in this case it should be like this in my after submit params = "repositories_attributes"=>{"0"=>{"repos_name"=>"svn_software"}{"1"=>{"repos_name"=>"svn_hardware"}}

推荐答案

正如 Nicolay 所解释的，你有 0 的原因是因为你构建了这个 @project_sub_type.repositories.build 对象一次.您代码中的所有内容都是正确的.但是，如果您必须选择多个复选框，则根据 DOCS

As Nicolay explains, the reason you have a 0 is because you build this @project_sub_type.repositories.build object once. Everything in your code is correct. But if you have to select multiple checkboxes then according to the DOCS

在视图中:_form.html.erb改变

<%= ff.check_box :repos_name, {}, "#{repos}", nil %>

至

<%= ff.check_box :repos_name, {:multiple => true}, "#{repos}", nil %>

现在您应该可以在提交后看到params，如下所示:

Now you should be able to see the params after submit as below:

=>{"0"=>{"repos_name"=>["svn_software", "svn_hardware"]}}

=>{"0"=>{"repos_name"=>["svn_software", "svn_hardware"]}}

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