编辑：主要问题是，当我添加引用字段时，我执行了剧院：引用而不是剧院：引用因此字段未标记为外键。一旦我解除了这些迁移并正确地重新进行了迁移，我就能够完成这项工作。
在我的showtimes控制器中，我试图自动将影院ID设置为用户输入的屏幕所拥有的任何影院，但是当我尝试将其保存为整数或字符串时，我收到错误。然而，当我尝试将其保存为剧院对象时，我从控制台获得“未经许可的参数：影院”，以及来自rails应用程序的“影院必须存在”错误。
showtimes_controller：
class ShowtimesController < ApplicationController
before_action :set_theater, only: [:create, :edit]
before_action :set_showtime, only: [:show, :edit, :update, :destroy]
# GET /showtimes
# GET /showtimes.json
def index
@showtimes = Showtime.all
end
# GET /showtimes/1
# GET /showtimes/1.json
def show
end
# GET /showtimes/new
def new
@showtime = Showtime.new
end
# GET /showtimes/1/edit
def edit
end
# POST /showtimes
# POST /showtimes.json
def create
@showtime = Showtime.new(showtime_params)
respond_to do |format|
if @showtime.save
format.html { redirect_to @showtime, notice: 'Showtime was successfully created.' }
format.json { render :show, status: :created, location: @showtime }
else
format.html { render :new }
format.json { render json: @showtime.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /showtimes/1
# PATCH/PUT /showtimes/1.json
def update
respond_to do |format|
if @showtime.update(showtime_params)
format.html { redirect_to @showtime, notice: 'Showtime was successfully updated.' }
format.json { render :show, status: :ok, location: @showtime }
else
format.html { render :edit }
format.json { render json: @showtime.errors, status: :unprocessable_entity }
end
end
end
# DELETE /showtimes/1
# DELETE /showtimes/1.json
def destroy
@showtime.destroy
respond_to do |format|
format.html { redirect_to showtimes_url, notice: 'Showtime was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_showtime
@showtime = Showtime.find(params[:id])
end
def set_theater
screenInfo = Screen.where("id = ?", params[:showtime][:screen])
params['showtime']['theater'] = Theater.find(screenInfo[0]['theater_id'])
end
# Never trust parameters from the scary internet, only allow the white list through.
def showtime_params
params.require(:showtime).permit(:date, :time, :archived, :movie_id, :theater, :screen)
end
end
showtimes模特：
class Showtime < ApplicationRecord
belongs_to :movie
belongs_to :theater
end
Showtimes _form
<%= form_for(showtime) do |f| %>
<% if showtime.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(showtime.errors.count, "error") %> prohibited this showtime from being saved:</h2>
<ul>
<% showtime.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :date %>
<%= f.date_select :date %>
</div>
<div class="field">
<%= f.label :time %>
<%= f.time_select :time %>
</div>
<div class="field">
<%= f.label :archived %>
<%= f.check_box :archived %>
</div>
<div class="field">
<%= f.label :movie_id %>
<%= f.text_field :movie_id %>
</div>
<div class="field">
<%= f.label :screen %>
<%= f.text_field :screen %>
</div>
<%= f.hidden_field :theater, :value => "" %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
尝试保存为整数时出错：
Theater(#70015922237640) expected, got Fixnum(#11723820)
尝试保存为字符串时出错：
Theater(#70015868755420) expected, got String(#11739240)
尝试保存为Theater对象时记录：
Started POST "/showtimes" for IP at 2016-11-08 20:22:37 +0000
Processing by ShowtimesController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"nENPV5d6YRXdcx3H+Xa9ZypGtyFlaTg+zyENGB10TmW9OyWxLR9Dsl7nDoG9irq+3qApiNA2/oEqL5RZ0SXorA==", "showtime"=>{"date(1i)"=>"2016", "date(2i)"=>"11", "date(3i)"=>"8", "time(1i)"=>"2016", "time(2i)"=>"11", "time(3i)"=>"8", "time(4i)"=>"20", "time(5i)"=>"22", "archived"=>"0", "movie_id"=>"2", "screen"=>"1", "theater"=>""}, "commit"=>"Create Showtime"}
[1m[36mScreen Load (0.3ms)[0m [1m[34mSELECT "screens".* FROM "screens" WHERE (id = '1')[0m
[1m[36mTheater Load (0.2ms)[0m [1m[34mSELECT "theaters".* FROM "theaters" WHERE "theaters"."id" = ? LIMIT ?[0m [["id", 1], ["LIMIT", 1]]
Unpermitted parameter: theater
[1m[35m (0.1ms)[0m [1m[36mbegin transaction[0m
[1m[36mMovie Load (0.2ms)[0m [1m[34mSELECT "movies".* FROM "movies" WHERE "movies"."id" = ? LIMIT ?[0m [["id", 2], ["LIMIT", 1]]
[1m[35m (0.2ms)[0m [1m[31mrollback transaction[0m
Rendering showtimes/new.html.erb within layouts/application
Rendered showtimes/_form.html.erb (13.6ms)
Rendered showtimes/new.html.erb within layouts/application (16.4ms)
Completed 200 OK in 323ms (Views: 86.5ms | ActiveRecord: 3.9ms)
我该怎么保存这个参数？
答案 0 :(得分：0)
您是否尝试将对象分配给实例变量，并在保存之前进行分配？
关于您的before_action
def set_theater
@theather = ... # Code to find the theather
end
关于您的创建操作
def create
@showtime = Showtime.new(showtime_params)
@showtime.theather = @theather
... # Code to save and handle errors
end
答案 1 :(得分：0)
您在代码中的多个位置使用theater代替theater_id，并且您需要在所有位置更改它，以便使其正常工作。
首先 - 您无法在我们的表单中选择theater ... html无法识别theater类型并且无法通过 - 因此您的表单需要改为传递theater_id（这将是一个很乐意处理的整数）。
# eg here make sure it's a theater_id
<%= f.hidden_field :theater_id, :value => @theater.id %>
接下来 - 你的要求/许可证可能会引发一些错误 - 你需要将它作为theater_id：
def showtime_params
params.require(:showtime).permit(:date, :time, :archived, :movie_id, :theater_id, :screen)
end
现在你需要使用screen-info参数取出影院 - 但是请记住，这可能会在nil中出现一段时间（所以一个guard-clause总是好的）：
def set_theater
if params[:showtime].present? && params[:showtime][:screen_id].present?
screen_info = Screen.find(params[:showtime][:screen_id])
@theater = Theater.find(screenInfo.theater_id)
end
end
注意：我已将更新的命名方案更新为轨道标准，并删除了您尝试将剧院设置为params的内容，如下所示：
params['showtime']['theater'] = Theater.find(screenInfo[0]['theater_id'])
我不知道你用这行代码实际上要做什么，但不管它是什么，params都没有这样做 - 考虑params是＆＃34;一组从用户传递给我们的东西，然后扔掉了＃34; - 我们不会用它来存储我们在控制器上创建的新值。那是@variable的用途
您能解释一下您正在尝试做的事情吗？我们将找到正确的方法：）