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トップに関する質問NoMethodError in BooksController#create　エラーを解決し、投稿機能を実装したい

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質問編集履歴

3

修正

2020/09/05 11:48

投稿

ntk__7__ksn
ntk__7__ksn

スコア14

test CHANGED
File without changes
test CHANGED
@@ -250,7 +250,9 @@
250
250
 
251
251
  **book.rb**
252
252
 
253
+ ```
254
+
253
- ```class Book < ApplicationRecord
255
+ class Book < ApplicationRecord
254
256
 
255
257
  validates :name, presence: true
256
258
 
@@ -260,39 +262,49 @@
260
262
 
261
263
  validates :author, presence: true
262
264
 
265
+
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+
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+ belongs_to :user
268
+
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+ has_many :categories
270
+
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+ has_many :categories, through: :books_categories
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+
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+ end
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+
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+ ```
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+
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+ **category.rb**
278
+
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+ ```
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+
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+ class Category < ApplicationRecord
282
+
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+ validates :name, presence: true
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+
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+
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+
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+ has_many :books
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+
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+ has_many :books, through: :books_categories
290
+
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+ end
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+
293
+ ```
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+
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+ **book_category.rb**
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+
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+ ```
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+
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+ class BookCategory < ApplicationRecord
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+
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+ validates :book_id, presence: true
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+
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  validates :category_id, presence: true
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304
 
265
305
 
266
306
 
267
- belongs_to :user
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+
268
-
269
- has_many :categories
270
-
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- has_many :categories, through: :books_categories
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-
273
- end
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-
275
- ```
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-
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- **category.rb**
278
-
279
- ```
280
-
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- class Category < ApplicationRecord
282
-
283
- has_many :books
284
-
285
- has_many :books, through: :books_categories
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-
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- end
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-
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- ```
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-
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- **book_category.rb**
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-
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- ```
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-
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- class BookCategory < ApplicationRecord
296
308
 
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  belongs_to :book
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310
 

2

修正

2020/09/05 11:48

投稿

ntk__7__ksn
ntk__7__ksn

スコア14

test CHANGED
File without changes
test CHANGED
@@ -248,6 +248,96 @@
248
248
 
249
249
  ```
250
250
 
251
+ **book.rb**
252
+
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+ ```class Book < ApplicationRecord
254
+
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+ validates :name, presence: true
256
+
257
+ validates :price, presence: true
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+
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+ validates :image, presence: true
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+
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+ validates :author, presence: true
262
+
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+ validates :category_id, presence: true
264
+
265
+
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+
267
+ belongs_to :user
268
+
269
+ has_many :categories
270
+
271
+ has_many :categories, through: :books_categories
272
+
273
+ end
274
+
275
+ ```
276
+
277
+ **category.rb**
278
+
279
+ ```
280
+
281
+ class Category < ApplicationRecord
282
+
283
+ has_many :books
284
+
285
+ has_many :books, through: :books_categories
286
+
287
+ end
288
+
289
+ ```
290
+
291
+ **book_category.rb**
292
+
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+ ```
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+
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+ class BookCategory < ApplicationRecord
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+
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+ belongs_to :book
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+
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+ belongs_to :category
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+
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+ end
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+
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+ ```
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+
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+ **user.rb**
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+
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+ ```
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+
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+ class User < ApplicationRecord
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+
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+ # Include default devise modules. Others available are:
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+
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+ # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
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+
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+ devise :database_authenticatable, :registerable,
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+
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+ :recoverable, :rememberable, :validatable
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+
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+ end
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+
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+
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+
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+ ```
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+
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+ **application_record.rb**
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+
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+ ```
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+
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+ class ApplicationRecord < ActiveRecord::Base
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+
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+ self.abstract_class = true
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+
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+ end
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+
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+
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+
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+ ```
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+
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+
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+
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  #自分で調べたことや試したこと
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  ・　下記category_idの記述の仕方が違うと判断し、検索して出てきた記述を書いてみたが全て違った

1

修正

2020/09/05 11:04

投稿

ntk__7__ksn
ntk__7__ksn

スコア14

test CHANGED
File without changes
test CHANGED
@@ -50,21 +50,97 @@
50
50
 
51
51
  ```
52
52
 
53
+ class BooksController < ApplicationController
54
+
55
+ before_action :move_to_index, except: [:index, :show]
56
+
57
+ before_action :set_book, only: [:edit, :show]
58
+
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+
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+
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+ def index
62
+
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+ @books = Book.all.order(created_at: :DESC)
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+
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+ end
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+
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+
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+
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+ def new
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+
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+ @book = Book.new
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+
73
+ end
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+
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+
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+
53
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  def create
54
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79
+ ActiveRecord::Base.transaction do
80
+
55
- Book.create(book_params)
81
+ book = Book.create!(book_params)
82
+
56
-
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+ BookCategory.create!(book: book, category_id: params[:category])
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+
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+ end
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+
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+ redirect_to root_path
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+
89
+ rescue ActiveRecord::RecordInvalid => e
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+
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+ render :new
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+
93
+ end
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+
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+
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+
97
+ def destroy
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+
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+ book = Book.find(params[:id])
100
+
101
+ book.destroy
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+
57
- if Book.create
103
+ if !book.save
58
104
 
59
105
  redirect_to root_path
60
106
 
107
+ end
108
+
109
+ end
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+
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+
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+
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+ def show
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+
115
+ end
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+
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+
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+
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+ def edit
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+
121
+ end
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+
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+
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+
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+ def update
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+
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+ book = Book.find(params[:id])
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+
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+ book.update(book_params)
130
+
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+ if book.save
132
+
133
+ redirect_to book_path(book.id)
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+
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  else
62
136
 
63
- render :new
137
+ render :index
64
-
138
+
65
- end
139
+ end
66
-
140
+
67
- end
141
+ end
142
+
143
+
68
144
 
69
145
 
70
146
 
@@ -74,11 +150,35 @@
74
150
 
75
151
  def book_params
76
152
 
153
+ params
154
+
77
- params.require(:book).permit(:name, :price, :author, :image, :user_id, { category_id: [] })
155
+ .require(:book).permit(:name, :price, :author, :image)
156
+
78
-
157
+ .merge(user_id: current_user.id)
158
+
79
- end
159
+ end
160
+
161
+
162
+
80
-
163
+ def set_book
164
+
81
-
165
+ @book = Book.find(params[:id])
166
+
167
+ end
168
+
169
+
170
+
171
+ def move_to_index
172
+
173
+ unless user_signed_in?
174
+
175
+ redirect_to action: :index
176
+
177
+ end
178
+
179
+ end
180
+
181
+ end
82
182
 
83
183
  ```
84
184