What I want to achieve
I have created an association between movies and schedules, but I don't know how to instantiate the association, even after reading the Rails Guide.
Code
db/schema
# movies
create_table "movies", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
t.string "name"
t.integer "year"
t.string "description"
t.string "image_url"
t.integer "is_showing"
t.datetime "created_at", precision: 6, null: false
t.datetime "updated_at", precision: 6, null: false
end
#schedules
create_table "schedules", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
t.bigint "movie_id", null: false
t.time "start_time", null: false
t.time "end_time", null: false
t.datetime "created_at", precision: 6, null: false
t.datetime "updated_at", precision: 6, null: false
t.index ["movie_id"], name: "index_schedules_on_movie_id"
end
model
movie.rb
class Movie < ApplicationRecord
has_many :schedules
end
schedule.rb
class Schedule < ApplicationRecord
belongs_to :movie
end
controller
schedules
class SchedulesController < ApplicationController
def index
@movies = Movie.joins(:schedules).select("movies.*", "schedules.*")
end
###############################################################################
# I don't get it.
def new
@schedule = @movie.build_schedules()
end
def create
@schedule = Schedule.new(schedule_params)
@schedule.save
redirect_to schedules_path
end
###############################################################################
private
def schedule_params
params.require(:schedule).permit(:start_time, :end_time)
end
end
new.html.erb
<!DOCTYPE html>
<html lang="en">
<head>
<%= render 'shared/head' %>
<title>schedule/new</title>
</head>
<body>
<%= form_with model: @schedule, url: movie_schedules_path do |form| %>
<div class="field">
<%= form.label :start_time %>
<%= form.date_field :start_time %>
</div>
<div class="field">
<%= form.label :end_time %>
<%= form.date_field :end_time %>
<%= form.submit %>
</div>
<% end %>
</body>
</html>
What I've tried.
・Check the Rails Guide.
I was using build instead of new, but it took an argument. I didn't know what I needed for the argument part here.
# Rails Guide
@book.author = @author
@author = @book.build_author(author_number: 123,
author_name: "John Doe")
CodePudding user response：
You want to do @movie.schedules.build to instantiate a new record for the @movie.schedules association because it's a has_many.
You can also do @movie.schedules.create(schedule_params) to create the Schedule associated to the Movie instance in one step.
record.build_xxx only works for has_many/belongs_to associations (you could do some_schedule.build_movie for example).