我创建了一个食谱支架，允许用户创建许多食谱。我将user_id与控制器中的cookbook相关联，但标题和描述在rails数据库中显示为nil。
class CookBooksController < ApplicationController
before_action :set_cook_book, only: [:show, :edit, :update, :destroy]
# GET /cook_books
# GET /cook_books.json
def index
@cook_books = CookBook.all
end
# GET /cook_books/1
# GET /cook_books/1.json
def show
end
# GET /cook_books/new
def new
@cook_book = CookBook.new()
end
# GET /cook_books/1/edit
def edit
end
# POST /cook_books
# POST /cook_books.json
def create
@cook_book = CookBook.new(cook_book_params)
@cook_book.user_id = current_user.id
respond_to do |format|
if @cook_book.save
format.html { redirect_to @cook_book, notice: 'Cook book was successfully created.' }
format.json { render :show, status: :created, location: @cook_book }
else
format.html { render :new }
format.json { render json: @cook_book.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /cook_books/1
# PATCH/PUT /cook_books/1.json
def update
respond_to do |format|
if @cook_book.update(cook_book_params)
format.html { redirect_to @cook_book, notice: 'Cook book was successfully updated.' }
format.json { render :show, status: :ok, location: @cook_book }
else
format.html { render :edit }
format.json { render json: @cook_book.errors, status: :unprocessable_entity }
end
end
end
# DELETE /cook_books/1
# DELETE /cook_books/1.json
def destroy
@cook_book.destroy
respond_to do |format|
format.html { redirect_to cook_books_url, notice: 'Cook book was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_cook_book
@cook_book = CookBook.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def cook_book_params
params.require(:cook_book).permit(:title, :user_id, :description)
end
end
class CookBook < ActiveRecord::Base
belongs_to :users
end
ActiveRecord::Schema.define(version: 20140811235307) do
create_table "cook_books", force: true do |t|
t.string "title"
t.integer "user_id"
t.string "description"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "pages", force: true do |t|
t.datetime "created_at"
t.datetime "updated_at"
t.text "header"
end
create_table "users", force: true do |t|
t.string "email", default: "", null: false
t.string "encrypted_password", default: "", null: false
t.string "reset_password_token"
t.datetime "reset_password_sent_at"
t.datetime "remember_created_at"
t.integer "sign_in_count", default: 0, null: false
t.datetime "current_sign_in_at"
t.datetime "last_sign_in_at"
t.string "current_sign_in_ip"
t.string "last_sign_in_ip"
t.datetime "created_at"
t.datetime "updated_at"
t.string "username"
t.string "country"
t.string "address"
t.string "provider"
t.string "uid"
t.boolean "admin", default: false
end
add_index "users", ["email"], name: "index_users_on_email", unique: true
add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
end
任何帮助都欣赏它！谢谢
EDIT！表格已添加
<%= form_for(@cook_book) do |f| %>
<% if @cook_book.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@cook_book.errors.count, "error") %> prohibited this cook_book from being saved:</h2>
<ul>
<% @cook_book.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :title %><br>
<%= f.text_field :title %>
</div>
<div class="field">
<%= f.label :description %><br>
<%= f.text_field :description %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
EDIT！服务器日志
Started GET "/cook_books/new" for 127.0.0.1 at 2014-08-12 02:21:05 -0400
ActiveRecord::SchemaMigration Load (0.2ms) SELECT "schema_migrations".* FROM "schema_migrations"
Processing by CookBooksController#new as HTML
Rendered cook_books/_form.html.erb (30.2ms)
Rendered cook_books/new.html.erb within layouts/application (36.9ms)
User Load (0.4ms) SELECT "users".* FROM "users" WHERE "users"."id" = 1 ORDER BY "users"."id" ASC LIMIT 1
Rendered layouts/_header.html.erb (28.2ms)
Completed 200 OK in 335ms (Views: 306.3ms | ActiveRecord: 1.7ms)
Started POST "/cook_books" for 127.0.0.1 at 2014-08-12 02:21:15 -0400
Processing by CookBooksController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"TNDketl0ixC8Lh/aAWIGf7SWeiwHZR9ITlEEpa7/+xM=", "cook_book"=>{"title"=>"Test title", "description"=>"test description "}, "commit"=>"Create Cookbook"}
**WARNING: Can't mass-assign protected attributes for CookBook: title, description
app/controllers/cook_books_controller.rb:28:in `create'** (Just saw this)
User Load (0.4ms) SELECT "users".* FROM "users" WHERE "users"."id" = 1 ORDER BY "users"."id" ASC LIMIT 1
(0.1ms) begin transaction
SQL (0.9ms) INSERT INTO "cook_books" ("created_at", "updated_at", "user_id") VALUES (?, ?, ?) [["created_at", "2014-08-12 06:21:15.547634"], ["updated_at", "2014-08-12 06:21:15.547634"], ["user_id", 1]]
(1.4ms) commit transaction
Redirected to http://localhost:3000/cook_books/8
Completed 302 Found in 29ms (ActiveRecord: 2.9ms)
Started GET "/cook_books/8" for 127.0.0.1 at 2014-08-12 02:21:15 -0400
Processing by CookBooksController#show as HTML
Parameters: {"id"=>"8"}
CookBook Load (0.4ms) SELECT "cook_books".* FROM "cook_books" WHERE "cook_books"."id" = ? LIMIT 1 [["id", 8]]
Rendered cook_books/show.html.erb within layouts/application (1.4ms)
User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = 1 ORDER BY "users"."id" ASC LIMIT 1
Rendered layouts/_header.html.erb (2.3ms)
Completed 200 OK in 34ms (Views: 30.9ms | ActiveRecord: 0.7ms
）
EDIT！型号
class CookBook < ActiveRecord::Base
belongs_to :users
end
答案 0 :(得分：1)
您的代码很好，但是当查看server log时，您会收到此警告
无法为CookBook大量分配受保护的属性：title， 描述
根据评论，确认您拥有此宝石protected_attributes。这会添加默认attr_accessible。但是当它带有Rails4时，此宝石不是必需的。您可以使用此宝石。需要删除它以使事情有效。
小记：
正如 @Jaugar Chang 指出的那样，你有belongs_to :users。它应该是belongs_to :user。这会导致更多问题。