我有一个简单的has_many,belongs_to关联。
class Actor < ActiveRecord::Base
belongs_to :movie
end
和
class Movie < ActiveRecord::Base
has_many :actors, dependent: :destroy
after_save :fill_actors_table
validates_presence_of :title
def fill_actors_table
movie_list = Imdb::Search.new("Lion King")
new_movie = movie_list.movies.first
id = new_movie.id
i = Imdb::Movie.new("#{id}")
i.cast_members.each do |actor_name|
actor_image = Google::Search::Image.new(:query => actor_name).first
actor_image_url = actor_image.uri
Actor.create(:name => actor_name, :file => actor_image_url)
end
end
我的架构如下所示:
ActiveRecord::Schema.define(version: 20150821182841) do
create_table "actors", force: true do |t|
t.string "name"
t.string "file"
t.integer "actor_id", limit: 255
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "movies", force: true do |t|
t.string "title"
t.datetime "created_at"
t.datetime "updated_at"
end
end
但我一直收到错误
SQLite3::SQLException: no such column: actors.movie_id: SELECT "actors".* FROM "actors" WHERE "actors"."movie_id" = ?
我不会在任何地方使用movie_id !!!
电影控制器代码:
class MoviesController < ApplicationController
before_action :set_movie, only: [:show, :edit, :update, :destroy]
# GET /movies
# GET /movies.json
def index
@movies = Movie.all
end
# GET /movies/1
# GET /movies/1.json
def show
end
# GET /movies/new
def new
@movie = Movie.new
end
# GET /movies/1/edit
def edit
end
# POST /movies
# POST /movies.json
def create
@movie = Movie.find_or_create_by(movie_params)
respond_to do |format|
if @movie.save
format.html { redirect_to @movie, notice: 'Movie was successfully created.' }
format.json { render :show, status: :created, location: @movie }
else
format.html { render :new }
format.json { render json: @movie.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /movies/1
# PATCH/PUT /movies/1.json
def update
respond_to do |format|
if @movie.update(movie_params)
format.html { redirect_to @movie, notice: 'Movie was successfully updated.' }
format.json { render :show, status: :ok, location: @movie }
else
format.html { render :edit }
format.json { render json: @movie.errors, status: :unprocessable_entity }
end
end
end
# DELETE /movies/1
# DELETE /movies/1.json
def destroy
@movie.destroy
respond_to do |format|
format.html { redirect_to movies_url, notice: 'Movie was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_movie
@movie = Movie.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def movie_params
params.require(:movie).permit(:title)
end
end
演员控制器刚刚生成,并且在很大程度上与电影控制器完全相同。
我想要完成的事情: 搜索电影。电影名称保存在电影数据库中。然后它使用imdb gem提取电影中的演员列表,并使用google-search gem搜索他们的图像。图像网址和参与者名称保存在actor数据库中。
我注意到当我放入电影时,有时似乎会将演员名称列出两次(好像有两个for循环)。我无法弄清楚我的代码在哪里可能会让它运行两次。
这是我在整个项目中编写的唯一代码,而不是基本形式。
答案 0 :(得分:1)
您需要使用belongs_to。
在模型中使用外键使用时:
belongs_to :some_model
rails假定:some_model_key在模型中。你的actor模型中没有:movie_id,所以当你尝试引用一部电影时,rails会在你的演员模型中寻找:movie_id并且无法找到它。您可以使用active migration.
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