在rails窗体中维护数组的顺序 [英] Maintain the order of an array in rails forms

问题描述

我有3个模型（Workout，WorkoutSet，WorkoutStep）和以下关联：

• 锻炼有很多套


• 一个WorkoutSet有许多WorkoutSep


• 而一个WorkoutStep有一组视频（称为 video_usage [] ））

使用simple_form和cocoon我让表单编辑这些关联，但是在最深层次（WorkoutStep的视频数组）当我编辑锻炼时，顺序看起来并不是恒定的，相反，最后一次属性被修改（在这种情况下，修改是改变一个属性，比如选择另一个视频），排序（猜测）。

我希望视频数组在编辑时保持不变。

这就是我的表单的样子：

_workout_sets_fields.html.haml

  .nested-fields 
 = f.simple_fields_for：main_video_usage do | mv | 
 =渲染'main_video_usage_fields'，f：mv 
 .steps {：style => margin-left：680px} 
 = link_to_remove_association'remove step'，f 
 = link_to_add_association'add video'，f：：main_video_usage 
   
   _main_video_usage_fields.html.haml   
  .nested-fields 
 = f.collection_select：video_id，Video.all.order（：title），：id，：title 
  
 
 
解决方案
您可以给出明确的顺序，使用 id 或 created_at 如果您想保留创建顺序： 
 
 
  has_many：main_video_usage， - > {order（'id asc'）}，class_name：'VideoUsage :: Main'，as：：parent 
  
 
I have 3 models (Workout, WorkoutSet, WorkoutStep) with the following associations:



A Workout has many sets
A WorkoutSet has many WorkoutSep
And a WorkoutStep has an array of videos (called video_usage[])


Using simple_form and cocoon I made the forms to edit such associations but, at the deepest level (the array of videos of WorkoutStep) by the time I edit a Workout, the order seem not to be constant, being, instead, ordered by (guessing) the last time the attribute has been modified (in this case, modified is changing a property, such as selecting another video).

I want the array of videos to remain constant between edits.

This is how my form looks like:

_workout_sets_fields.html.haml
.nested-fields
  = f.simple_fields_for :main_video_usage do |mv|
    = render 'main_video_usage_fields', f: mv
  .steps{ :style => "margin-left: 680px" }
    = link_to_remove_association 'remove step', f
    = link_to_add_association 'add video', f, :main_video_usage
_main_video_usage_fields.html.haml
.nested-fields
  = f.collection_select :video_id, Video.all.order(:title), :id, :title

解决方案
You can give an explicit order, use id or created_at if you want to keep the order of creation: 
has_many :main_video_usage, -> { order('id asc') }, class_name: 'VideoUsage::Main', as: :parent


                        
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