[英]nested forms in Rails 4 doesn't seem to work
我已經看了太久了,所以去吧。
3.times { @collection.collections_components.build }
構建3個“集合組件”(我的模型)。 我確實得到了一個字段,但是3.times
被忽略了。 f.fields_for :collection_components
被忽略了。 可以將其更改為f.fields_for :xyz
,並執行相同的一個字段。 在此進行以下操作: http : //guides.rubyonrails.org/form_helpers.html#nested-forms
這是一些代碼:
collection.rb
class Collection < ActiveRecord::Base
has_many :collections_components, dependent: :destroy
accepts_nested_attributes_for :collections_components, allow_destroy: true
end
collections_component.rb
class CollectionsComponent < ActiveRecord::Base
belongs_to :collection
end
_form.html.erb
<%= form_for @collection do |f| %>
<% if @collection.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@collection.errors.count, "error") %> prohibited this collection from being saved:</h2>
<ul>
<% @collection.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<%= f.fields_for :collection_components do |collection_components_form| %>
<h2>Collection</h2>
<%= collection_components_form.label :text %>
<%= collection_components_form.text_field :text %>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
collections_controller.rb
class CollectionsController < ApplicationController
before_action :set_collection, only: [:show, :edit, :update, :destroy]
def index
@collections = Collection.all
end
def show
end
def new
@collection = Collection.new
3.times { @collection.collections_components.build }
end
def edit
end
def create
@collection = Collection.new(collection_params)
respond_to do |format|
if @collection.save
format.html { redirect_to @collection, notice: 'Collection was successfully created.' }
format.json { render :show, status: :created, location: @collection }
else
format.html { render :new }
format.json { render json: @collection.errors, status: :unprocessable_entity }
end
end
end
def update
respond_to do |format|
if @collection.update(collection_params)
format.html { redirect_to @collection, notice: 'Collection was successfully updated.' }
format.json { render :show, status: :ok, location: @collection }
else
format.html { render :edit }
format.json { render json: @collection.errors, status: :unprocessable_entity }
end
end
end
def destroy
@collection.destroy
respond_to do |format|
format.html { redirect_to collections_url, notice: 'Collection was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_collection
@collection = Collection.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def collection_params
params.require(:collection).permit(:name, collections_components_attributes: [:text])
end
end
我認為這可能是問題所在,您正在以_form(在集合名稱的中間)將資源稱為單數而不是復數
<%= f.fields_for :collection_components do |collection_components_form| %>
代替這個:
<%= f.fields_for :collections_components do |collection_components_form| %>
就像我一直在使用nested_forms之前,我知道您將需要傳遞“ id”並且僅當您允許破壞屬性的“ _destroy”參數到strong_parameters一樣,因此對它進行添加將對您有所幫助
def collection_params
params.require(:collection).permit(:name, collections_components_attributes: [:text])
end
所以你應該有這樣的東西:
def collection_params
params.require(:collection).permit(:name, {collections_components_attributes: [:id, :text, :_destroy]})
end
另外,我會建議將此railscasts用於將來的研究,並推薦一個名為cocoon的出色寶石來輕松制作nested_forms
希望對您有所幫助!
您需要顯示所有collections_components
表單。 更改:
<%= f.fields_for :collection_components do |collection_components_form| %>
<h2>Collection</h2>
<%= collection_components_form.label :text %>
<%= collection_components_form.text_field :text %>
<% end %>
至:
<% @collection.collection_components.each do |collections_component| %>
<%= f.fields_for :collection_components, collections_component do |collection_components_form| %>
<h2>Collection</h2>
<%= collection_components_form.hidden_field :id %>
<%= collection_components_form.label :text %>
<%= collection_components_form.text_field :text %>
<% end %>
<% end %>
id
的隱藏字段對於更新是必需的。 還要確保它包含在強參數中。
編輯:
我在Rails 4.0.8中遇到了這個問題。 該版本的文檔建議each
此解決方案 。 Rails 4.2.0的文檔開始建議僅使用fields_for
。 我懷疑fields_for
開始直接在4.2.0中處理收集,盡管我找不到任何更改日志。
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