使用collection_select在HABTM关系中创建多个记录-Rails [英] Creating multiple records in a HABTM relationship using a collection_select - Rails

问题描述

我在锻炼和小组之间有一个has_and_belongs_to_many关系.

I have a has_and_belongs_to_many relationship between workouts and groups.

我正在使用分组中的collection_select来向组中添加锻炼.

I have a collection_select in groups that I'm using to add workouts to groups.

问题是我只能更改HABTM表中的一条记录，因此我只能添加一条记录，然后编辑该记录.如何添加其他记录?

The problem is that I can only change the one record in the HABTM table, so I can only add one record, then edit that record. How do I add additional records?

有什么想法吗?

这是一些代码:

show.html.erb:

<%= form_for(@group) do |f| %>
  <%= f.collection_select 'workout_ids', Workout.all, :id, :name, { :include_blank => ""} %>

  <%= f.submit %>
<% end %>

.

class Workout < ActiveRecord::Base
  attr_accessible :name, :exercises_attributes, :workout_exercises_attributes, :group_ids

  has_and_belongs_to_many :groups

.

class Group < ActiveRecord::Base
  attr_accessible :cycle_id, :name, :next_group_id, :previous_group_id, :workout_ids

  has_and_belongs_to_many :workouts

推荐答案

因此，答案是使用以下命令在控制器中编辑更新操作:

So the answer to this is to edit the update action in the controller with this:

workout_id = params[:group].delete(:workout_ids)

    # Adding a workout
    if workout_id
      workout = Workout.find(workout_id)
      @group.workouts << workout
    end

上面的代码创建了一个局部变量workout_id，该局部变量从:group中获取参数:group和:workout_id..delete方法删除了第二个参数，用于在更改名称时更新实际组.例如，组.

The above code creates a local variable workout_id that takes the parameters :group and :workout_id from within :group the .delete method removes the second parameter for updating the actual group when you change the name of the group, for example.

然后，我们只需将新的锻炼方式推送到@ group.workouts上，就可以在每次从集合选择中向组中添加新锻炼方式时在联接表中创建新记录.

Then we simply push a new workout onto @group.workouts, creating a new record in the join table every time we add a new workout to the group from the collection select.

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