[英]Mass assign a collection of existing records rails
I am trying to assign a collection of existing records to an existing (or new) associated record.我正在尝试将现有记录的集合分配给现有(或新)关联记录。
For example:例如:
class List < ApplicationRecord
has_and_belongs_to_many :items, join_table: :list_items
accepts_nested_attributes_for :items
end
class Item < ApplicationRecord
has_and_belongs_to_many :lists, join_table: :list_items
end
From my view for the List's Create or Edit forms, I am sending :name as well as :items_attributes with an :id for each record I want to associate to my List.从我对列表的创建或编辑表单的看法来看,我发送 :name 和 :items_attributes 以及我想要关联到我的列表的每条记录的 :id。
In my Lists controller, I do:在我的 Lists 控制器中,我这样做:
def update
items = Item.where(id: list_params[:items_attributes][:id])
@list.items = items
respond_to do |format|
// the following line breaks, because @list currently has no "item" (the
// association built previously hasn't been saved yet)
if @list.update(list_params)
format.html { redirect_to @list, notice: 'List was successfully updated.' }
format.json { render :show, status: :ok, location: @list }
else
format.html { render :edit }
format.json { render json: @list.errors, status: :unprocessable_entity }
end
end
end
However, I am getting但是,我得到
ActiveRecord::RecordNotFound in ListsController#update
Couldn't find Item with ID=1 for List with ID=1
How would I go about saving this association in a "Rails" way?我将如何以“Rails”方式保存此关联?
list_params
would be something like this (using Cocoon gem): list_params
将是这样的(使用 Cocoon gem):
{"name"=>"Standard location shoot", "items_attributes"=><ActionController::Parameters {"1582459909419"=><ActionController::Parameters {"id"=>"1"} permitted: true>} permitted: true>}
Unfiltered parameters are: {"utf8"=>"✓", "_method"=>"patch", "authenticity_token"=>"qkXKM9U/1+Y8T4RttvPg==", "list"=>{"name"=>"Standard location shoot", "items_attributes"=>{"1582459152520"=>{"id"=>"1", "_destroy"=>"false"}}}, "commit"=>"Update List", "controller"=>"lists", "action"=>"update", "id"=>"1"}
未过滤的参数有:
{"utf8"=>"✓", "_method"=>"patch", "authenticity_token"=>"qkXKM9U/1+Y8T4RttvPg==", "list"=>{"name"=>"Standard location shoot", "items_attributes"=>{"1582459152520"=>{"id"=>"1", "_destroy"=>"false"}}}, "commit"=>"Update List", "controller"=>"lists", "action"=>"update", "id"=>"1"}
And more generally, the definition for list_params
is:更一般地说,
list_params
的定义是:
# Never trust parameters from the scary internet, only allow the white list through.
def list_params
params.fetch(:list, {}).permit(:name, items_attributes: [:id])
end
@list.items = items
mean list has many item, and items table have list_id column. @list.items = items
表示列表有很多项,items 表有 list_id 列。
You can try @list.update item_ids: list_params[:items_attributes][:id]
你可以试试
@list.update item_ids: list_params[:items_attributes][:id]
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