我有三种型号 - 用户，制造商和生产线。我需要用户拥有多个制造商，每个制造商都有多条生产线。我终于将行最终拉到_form上的manufacturer_id，但现在它没有保存'line'的'name'，只保存id。它会将'name'保存为nil，就像它没有从表单中传递名称一样。我已经阅读了关于此的标准文档，我不能为我的生活让它工作。它一直挂在控制器的最后创建阶段，我感觉我在窗体和控制器的路径上有很多错误。希望有人能够轻松对待我并帮助我让整个shebang工作。
user.rb
class User < ActiveRecord::Base
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_many :manufacturers
end
manufacturer.rb
class Manufacturer < ActiveRecord::Base
belongs_to :user
has_many :lines
end
line.rb
class Line < ActiveRecord::Base
belongs_to :manufacturer
end
lines_controller.rb
class LinesController < ApplicationController
before_action :set_line, only: [:show, :edit, :update, :destroy]
before_filter :load_manufacturer
# GET /lines
# GET /lines.json
def index
@lines = Line.all
end
# GET /lines/1
# GET /lines/1.json
def show
end
# GET /lines/new
def new
@manufacturer = Manufacturer.find(params[:manufacturer_id])
@line = @manufacturer.lines.build
end
# GET /lines/1/edit
def edit
end
# POST /lines
# POST /lines.json
def create
@line = @manufacturer.lines.build
respond_to do |format|
if @line.save
format.html { redirect_to @line, notice: 'Line was successfully created.' }
format.json { render action: 'show', status: :created, location: @line }
else
format.html { render action: 'new' }
format.json { render json: @line.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /lines/1
# PATCH/PUT /lines/1.json
def update
respond_to do |format|
if @line.update(line_params)
format.html { redirect_to @line, notice: 'Line was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: @line.errors, status: :unprocessable_entity }
end
end
end
# DELETE /lines/1
# DELETE /lines/1.json
def destroy
@line.destroy
respond_to do |format|
format.html { redirect_to lines_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_line
@line = Line.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def line_params
params.require(:line).permit(:name, :manufacturer_id)
end
def load_manufacturer
@manufacturer = Manufacturer.find(params[:manufacturer_id])
end
end
行/ _form.html.erb
<%= form_for [@manufacturer,@line] do |f| %>
<% if @line.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@line.errors.count, "error") %> prohibited this line from being saved:</h2>
<ul>
<% @line.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :manufacturer_id %><br>
<%= f.text_field :manufacturer_id %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
的routes.rb
Linecarder::Application.routes.draw do
resources :manufacturers do
resources :lines
end
devise_for :users
root "pages#home"
get "about" => "pages#about"
match 'users/:id' => 'users#show', :via => "get"
match '/users', :to => 'users#index', :as => "all_users", :via => "get"
match '/users/:name' => 'users#show', via: :get, as: :public_profile
end
rake routes
Prefix Verb URI Pattern Controller#Action
manufacturer_lines GET /manufacturers/:manufacturer_id/lines(.:format) lines#index
POST /manufacturers/:manufacturer_id/lines(.:format) lines#create
new_manufacturer_line GET /manufacturers/:manufacturer_id/lines/new(.:format) lines#new
edit_manufacturer_line GET /manufacturers/:manufacturer_id/lines/:id/edit(.:format) lines#edit
manufacturer_line GET /manufacturers/:manufacturer_id/lines/:id(.:format) lines#show
PATCH /manufacturers/:manufacturer_id/lines/:id(.:format) lines#update
PUT /manufacturers/:manufacturer_id/lines/:id(.:format) lines#update
DELETE /manufacturers/:manufacturer_id/lines/:id(.:format) lines#destroy
manufacturers GET /manufacturers(.:format) manufacturers#index
POST /manufacturers(.:format) manufacturers#create
new_manufacturer GET /manufacturers/new(.:format) manufacturers#new
edit_manufacturer GET /manufacturers/:id/edit(.:format) manufacturers#edit
manufacturer GET /manufacturers/:id(.:format) manufacturers#show
PATCH /manufacturers/:id(.:format) manufacturers#update
PUT /manufacturers/:id(.:format) manufacturers#update
DELETE /manufacturers/:id(.:format) manufacturers#destroy
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
root GET / pages#home
about GET /about(.:format) pages#about
GET /users/:id(.:format) users#show
all_users GET /users(.:format) users#index
public_profile GET /users/:name(.:format) users#show
答案 0 :(得分：3)
更新create操作，如下所示：
def create
@line = @manufacturer.lines.build(line_params) ## Pass the params via line_params
respond_to do |format|
if @line.save
format.html { redirect_to @line, notice: 'Line was successfully created.' }
format.json { render action: 'show', status: :created, location: @line }
else
format.html { render action: 'new' }
format.json { render json: @line.errors, status: :unprocessable_entity }
end
end
end
您没有传递从表单收到的参数。因此，name行不会保存在数据库中。
此外，为了允许质量分配属性（强参数）通过line_params方法传递它们。
更新，以解决要解决的评论中的OP问题
undefined method 'line_url'... for 'format.html { redirect_to @line, notice: 'Line was successfully created.' }'
使用此
format.html { redirect_to manufacturer_line_path(@manufacturer, @line), notice: 'Line was successfully created.' }
而不是
format.html { redirect_to @line, notice: 'Line was successfully created.' }