如何将 simpleForm 元素中的额外详细信息传递给 rails 中的控制器答案

【问题标题】：How can I pass extra details from simpleForm elements to my controller in rails如何将 simpleForm 元素中的额外详细信息传递给 rails 中的控制器
【发布时间】：2015-10-10 09:31:36
【问题描述】：

我在 Rails 中使用 SimpleForm，我向用户显示了 2 个字段，用于从预先过滤的一组位置中选择一个位置（丰富的关联）。每个选择都需要连同它所在的位置类型一起保存在连接表中。

如何创建一个表单，将信息发送回我的控制器，告诉我正在选择什么“类型”的位置。

_new_flow_form.html

      <%= simple_form_for @new_flow,:url => {:action => "company_create_flow", :controller => 'flows'}, :html => { :class => 'form-horizontal', :multipart => true } do |f| %>

            <%= f.label 'Workflow Title', :class => 'control-label' %>
            <%= f.text_field :title, :class => 'form-control' %>

            <%= f.association :locations, collection: Location.where(:company_id => @company.id, :source => 'TRUE'), :label => 'Source Location' %>
            <%= f.association :locations, collection: Location.where(:company_id => @company.id, :destination => 'TRUE'), :label => 'Destinations'%>

            <%= f.submit nil, :class => 'btn btn-primary' %>
      <% end %>

作为参考，我的模型如下所示：

位置.rb

  class Flow < ActiveRecord::Base
    has_many :flow_locations
    has_many :locations, :through => :flow_locations
  end

流.rb

  class Location < ActiveRecord::Base
    has_many :flow_locations
    has_many :flows, :through => :flow_locations
  end

flow_location.rb

  class FlowLocation < ActiveRecord::Base
    belongs_to :flow
    belongs_to :location

    serialize :source
    serialize :destination
  end

我在提交表单时得到的当前结果是这样的：

{
"utf8": "✓",
"authenticity_token": "Z3f4lByIebmvz4wgFGQGPP7xoVeLIFgSE0MSak9KfZxP3yoH7SFBjH5upD+mx+pRZ61bXqwl+e2o3qEX3dfYAw==",
"flow": {
    "title": "testMe",
    "company_id": "1",
    "service_ids": [
        "",
        "2"
    ],
    "location_ids": [
        "",
        "3",
        "",
        "1"
    ]
},
"commit": "Create Flow"
}

这里的主要问题是，我无法从中破译哪些 location_id 用于“来源”，哪些用于“目的地”

谁能帮我理解我在这里可以做些什么不同的事情，以便从可以具体告诉我哪个 location_id 用于哪个视图的视图中得到更好的东西？

【问题讨论】：

标签： ruby-on-rails ruby ruby-on-rails-4 model-associations

【解决方案1】：

您可以只更改 HTML 元素的 name 属性：

<%= f.association :locations, collection: Location.where(:company_id => @company.id, :source => 'TRUE'), :label => 'Source Location' name: "source_ids" %>
<%= f.association :locations, collection: Location.where(:company_id => @company.id, :destination => 'TRUE'), :label => 'Destinations' name: "destination_ids"%>

但这会将属性推出flow对象

{
"utf8": "✓",
"authenticity_token": "Z3f4lByIebmvz4wgFGQGPP7xoVeLIFgSE0MSak9KfZxP3yoH7SFBjH5upD+mx+pRZ61bXqwl+e2o3qEX3dfYAw==",
"flow": {
    "title": "testMe",
    "company_id": "1",
    "service_ids": [
        "",
        "2"
    ]    },
"commit": "Create Flow",
"source_ids":[
    "1"
 ],
"destination_ids":[
    "3"
 ]
}

或

在 Rails 4 中，您可以在 Flow 模型中使用范围关联：

class Flow < ActiveRecord::Base
  has_many :flow_locations
  has_many :destinations, -> { destinations: true }, :class_name => 'Location', :through => :flow_locations
  has_many :sources, -> { source: true }, :class_name => 'Location', :through => :flow_locations
  has_many :destinations, 
end

并相应地更新您的视图_new_flow_form.html：

<%= f.association :sources, collection: Location.where(:company_id => @company.id, :source => 'TRUE'), :label => 'Source Location' %>
<%= f.association :destinations, collection: Location.where(:company_id => @company.id, :destination => 'TRUE'), :label => 'Destinations'%>

【讨论】：