[英]Use a single form_with to create and edit nested resources in Rails
在我的應用程序內部,一個系列由許多書籍組成。 系列的“顯示”頁面允許用戶查看系列中的所有書籍並使用表單向系列添加新書籍。
Show頁面上列出的每本書都有一個指向該書的Edit頁面的鏈接。 編輯頁面包含用於最初添加書籍的相同表單。 編輯書籍時,表單應自動填充書籍現有信息。
如何配置我的form_with
標簽,以便它既可以創建新書又可以編輯現有書(自動填寫編輯表單)? 我嘗試了以下配置,但它們要么破壞了編輯頁面,要么破壞了顯示頁面:
<%= form_with(model: [ @series, @series.books.build ], local: true) do |form| %>
<%= form_with(model: @book, url: series_book_path, local: true) do |form| %>
No route matches {:action=>"show", :controller=>"books", :id=>"6"}, missing required keys: [series_id]
<%= form_with(model: [:series, @book], local: true) do |form| %>
Undefined method 'model_name' for nil:NilClass
<%= form_with(model: [@series, @series.books.find(@book.id)], local: true) do |form| %>
undefined method 'id' for nil:NilClass
<%= form_with(model: @book, url: [@series, @book], local: true) do |form| %>
No route matches [POST] "/series/6"
下面是相關代碼的精簡部分,以及指向它們在我當前 GitHub 存儲庫中的位置的鏈接。
resources :series do
resources :books
end
class Book < ApplicationRecord
belongs_to :series
end
class Series < ApplicationRecord
has_many :books, dependent: :destroy
end
create_table "books", force: :cascade do |t|
t.integer "series_number"
t.integer "year_published"
t.integer "series_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["series_id"], name: "index_books_on_series_id"
end
create_table "series", force: :cascade do |t|
t.string "title"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
<%= render @series.books %>
<%= render 'books/form' %>
<%= link_to 'Edit', edit_series_book_path(book.series, book) %>
app/views/books/ edit.html.erb
<%= render 'form' %>
<%= form_with(model: @book, url: [@series, @book], local: true) do |form| %>
<%= form.label :series_number %>
<%= form.number_field :series_number %>
<%= form.label :year_published %>
<%= form.number_field :year_published %>
<% end %>
class BooksController < ApplicationController
def index
@books = Book.all
end
def show
@book = Book.find(params[:id])
end
def new
@book = Book.new
end
def edit
@series = Series.find(params[:series_id])
@book = @series.books.find(params[:id])
end
def create
@series = Series.find(params[:series_id])
@book = @series.books.create(book_params)
redirect_to series_path(@series)
end
def destroy
@series = Series.find(params[:series_id])
@book = @series.books.find(params[:id])
@book.destroy
redirect_to series_path(@series)
end
private
def book_params
params.require(:book).permit(:year_published, :series_number)
end
end
Prefix Verb URI Pattern Controller#Action
articles GET /articles(.:format) articles#index
POST /articles(.:format) articles#create
new_article GET /articles/new(.:format) articles#new
edit_article GET /articles/:id/edit(.:format) articles#edit
article GET /articles/:id(.:format) articles#show
PATCH /articles/:id(.:format) articles#update
PUT /articles/:id(.:format) articles#update
DELETE /articles/:id(.:format) articles#destroy
series_books GET /series/:series_id/books(.:format) books#index
POST /series/:series_id/books(.:format) books#create
new_series_book GET /series/:series_id/books/new(.:format) books#new
edit_series_book GET /series/:series_id/books/:id/edit(.:format) books#edit
series_book GET /series/:series_id/books/:id(.:format) books#show
PATCH /series/:series_id/books/:id(.:format) books#update
PUT /series/:series_id/books/:id(.:format) books#update
DELETE /series/:series_id/books/:id(.:format) books#destroy
series_index GET /series(.:format) series#index
POST /series(.:format) series#create
new_series GET /series/new(.:format) series#new
edit_series GET /series/:id/edit(.:format) series#edit
series GET /series/:id(.:format) series#show
PATCH /series/:id(.:format) series#update
PUT /series/:id(.:format) series#update
DELETE /series/:id(.:format) series#destroy
您可以將數組傳遞給表單以處理嵌套和“淺”路由:
<%= form_with(model: [@series, @book], local: true) do |form| %>
<% end %>
Rails 壓縮數組(刪除 nil 值),因此如果@series
為 nil,表單將回book_url(@book)
或books_url
。 但是,您需要從控制器正確處理設置@series
和@book
。
class SeriesController < ApplicationController
def show
@series = Series.find(params[:id])
@book = @series.books.new # used by the form
end
end
您可以使用局部變量在視圖中處理此問題:
# app/views/books/_form.html.erb
<%= form_with(model: model, local: true) do |form| %>
<% end %>
# app/views/books/edit.html.erb
<%= render 'form', locals: { model: [@series, @book] } %>
# app/views/series/show.html.erb
<%= render 'books/form', locals: { model: [@series, @series.book.new] } %>
你也可以在你的路由中使用shallow: true
選項來避免嵌套成員路由(顯示、編輯、更新、銷毀):
resources :series do
resources :books, shallow: true
end
這將讓你只做:
# app/views/books/edit.html.erb
<%= render 'form', model: @book %>
# app/views/books/_book.html.erb
<%= link_to 'Edit', edit_book_path(book) %>
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