Edited at

Railsでリソースを入れ子にする

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意外に大変だったので共有する。なお、開発環境にはRubyMineを使うが、その他の場合もほぼ同じだろう。


方針

Userリソースの下にWeightリソースを入れ子にして入れる(レコーディング・ダイエット・アプリケーション)。


Userモデルをつくる


  1. コードを書く

ユーザ認証に必要なbcrypt-ruby gemを入れる。


Gemfile

gem "bcrypt-ruby"



  1. bundle install


  2. Tools > Run Rails Generator > scaffold > User name:string password_digest:string


  3. Tools > Run Rake Task > db:migrate


  4. コードを書く



app/models/user.rb

class User < ActiveRecord::Base

attr_accessible :name, :password_digest, :password, :password_confirmation
validates :name, presence: true, uniqueness:true
has_secure_password
end


  1. コードを書く


app/views/users/_form.html.erb

<%= form_for(@user) do |f| %>

<% if @user.errors.any? %>
<div id=
"error_explanation">
<h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>

<ul>
<% @user.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 :password_digest %><br />
<%= f.text_field :password_digest %>
</div>-->

<!-- added from here -->
<div class="field">
<%= f.label :password %><br />
<%=
f.text_field :password %>
</div>

<div class="field">
<%= f.label :password_confirmation %><br />
<%= f.text_field :password_confirmation %>
</div>
<!-- to here -->

<div class="actions">
<%= f.submit %>
</div>
<% end %>




  1. http://localhost:3000/usersを見るとエラーメッセージが出ていることがある

undefined method `key?' for nil:NilClass

このときはサーバを再起動すればなおる



  1. http://localhost:3000/users/newを見るとユーザ登録画面が表示される


  1. ためしにユーザを登録してみると、ちゃんと登録されている


Weightモデルをつくる


  1. Tools > Run Rails Generator > scaffold > Weight user:references weight_record:decimal memo:text


  2. Tools > Run Rake Task > db:migrate


  3. コードを書く



app/models/users.rb

has_many :weights



  1. モデル図を見る

userが0..*のweightを持っていることがわかる。


  1. コードを書く


config/routes.rb

  resources :users do

resources :weights
end


  1. Tools > Run Rake Task > routes

    user_weights GET    /users/:user_id/weights(.:format)          weights#index

POST /users/:user_id/weights(.:format) weights#create
new_user_weight GET /users/:user_id/weights/new(.:format) weights#new
edit_user_weight GET /users/:user_id/weights/:id/edit(.:format) weights#edit
user_weight GET /users/:user_id/weights/:id(.:format) weights#show
PUT /users/:user_id/weights/:id(.:format) weights#update
DELETE /users/:user_id/weights/:id(.:format) weights#destroy
users GET /users(.:format) users#index
POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
edit_user GET /users/:id/edit(.:format) users#edit
user GET /users/:id(.:format) users#show
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy

UserのビューとWeightのコントローラ、ビューは、この新しいrouteに対応していないので、すべて直してあげる必要がある。


User indexビューをつくる


  1. コードを書く


app/views/users/index.html.erb

<h1>Listing users</h1>

<table>
<tr>
<th>Name</th>
<th>Password digest</th>
<!-- added next line -->
<th></
th>
<th></th>
<th></
th>
<th></th>
</
tr>

<% @users.each do |user| %>
<tr>

<td><%= user.name %></td>
<td><%=
user.password_digest %></td>
<!-- added next line -->
<td><%= link_to 'Show Weights', user_weights_path(user) %></td>
<td><%=
link_to 'Show', user %></td>
<td><%= link_to 'Edit', edit_user_path(user) %></td>
<td><%=
link_to 'Destroy', user, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</
tr>
<% end %>
</table>

<br />

<%= link_to 'New User', new_user_path %>


これでユーザ一覧の画面を表示できる。


Weightコントローラをつくる


  1. コードを書く


app/controllers/weights_controller.rb

class WeightsController < ApplicationController

# GET /weights
# GET /weights.json
def index
#@weights = Weight.all
@user = User.find(params[:user_id])
@weights = @user.weights.all

respond_to do |format|
format.html # index.html.erb
format.json { render json: @weights }
end
end

# GET /weights/1
# GET /weights/1.json
def show
#@weight = Weight.find(params[:id])
@user = User.find(params[:user_id])
@weight = @user.weights.find(params[:id])

respond_to do |format|
format.html # show.html.erb
format.json { render json: @weight }
end
end

# GET /weights/new
# GET /weights/new.json
def new
#@weight = Weight.new
@user = User.find(params[:user_id])
@weight = @user.weights.build

respond_to do |format|
format.html # new.html.erb
format.json { render json: @weight }
end
end

# GET /weights/1/edit
def edit
#@weight = Weight.find(params[:id])
@user = User.find(params[:user_id])
@weight = @user.weights.find(params[:id])
end

# POST /weights
# POST /weights.json
def create
#@weight = Weight.new(params[:weight])
@user = User.find(params[:user_id])
@weight = @user.weights.build(params[:weight])

respond_to do |format|
if @weight.save
#format.html { redirect_to @weight, notice: 'Weight was successfully created.' }
format.html { redirect_to [@user, @weight], notice: 'Weight was successfully created.' }
format.json { render json: @weight, status: :created, location: @weight }
else
format.html { render action: "new" }
format.json { render json: @weight.errors, status: :unprocessable_entity }
end
end
end

# PUT /weights/1
# PUT /weights/1.json
def update
#@weight = Weight.find(params[:id])
@user = User.find(params[:user_id])
@weight = @user.weights.build(params[:id])

respond_to do |format|
if @weight.update_attributes(params[:weight])
#format.html { redirect_to @weight, notice: 'Weight was successfully updated.' }
format.html { redirect_to [@user, @weight], notice: 'Weight was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: @weight.errors, status: :unprocessable_entity }
end
end
end

# DELETE /weights/1
# DELETE /weights/1.json
def destroy
#@weight = Weight.find(params[:id])
@user = User.find(params[:user_id])
@weight = @user.weights.build(params[:id])
@weight.destroy

respond_to do |format|
#format.html { redirect_to weights_url }
format.html { redirect_to user_weights_url }
format.json { head :no_content }
end
end
end



Weight indexビューをつくる


  1. コードを書く


app/views/weights/index.html.erb

<h1>Listing weights</h1>

<table>
<tr>
<th>User</th>
<th>Weight record</th>
<th>Memo</
th>
<th></th>
<th></
th>
<th></th>
</
tr>

<% @weights.each do |weight| %>
<tr>

<td><%= weight.user %></td>
<td><%=
weight.weight_record %></td>
<td><%= weight.memo %></td>
<!--<td><%#=
link_to 'Show', weight %></td>-->
<td><%= link_to 'Show', user_weight_path(weight.user, weight) %></td>
<!--<td><%#=
link_to 'Edit', edit_weight_path(weight) %></td>-->
<td><%= link_to 'Edit', edit_user_weight_path(weight.user, weight) %></
td>
<!--<td><%#= link_to 'Destroy', weight, method: :delete, data: { confirm: 'Are you sure?' } %></td>-->
<td><%= link_to 'Destroy', user_weight_path(weight.user, weight), method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>
</table>

<br />

<%#= link_to 'New Weight', new_weight_path %>
<%= link_to 'New Weight', new_user_weight_path %>


これで体重一覧の画面を表示することができる。


Weight newビューをつくる


  1. コードを書く


app/views/new.html.erb

<h1>New weight</h1>

<%= render 'form' %>

<%#= link_to 'Back', weights_path %>
<%= link_to 'Back', user_weights_path %>



app/views/_form.html.erb

<%#= form_for(@weight) do |f| %>

<%= form_for([@user, @weight]) do |f| %>
<% if @weight.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@weight.errors.count, "error") %> prohibited this weight from being saved:</h2>

<ul>
<% @weight.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>

<div class="field">
<%#= f.label :user %><br />
<%= f.label "User Id" %><br /
>
<%#= f.text_field :user %>
<%= f.text_field :user_id, disabled: true %>
</div>
<div class="field">
<%= f.label :weight_record %><br />
<%= f.text_field :weight_record %>
</div>
<div class="field">
<%= f.label :memo %><br />
<%= f.text_area :memo %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>


これで新規体重の入力画面を表示できる。


Weight showビューをつくる


  1. コードを書く


app/views/show.html.erb

<p id="notice"><%= notice %></p>

<p>
<!--<b>User:</b>-->
<b>User Name:</b>
<%#= @weight.user %>
<%= @weight.user.name %>

</p>

<p>
<b>Weight record:</b>
<%= @weight.weight_record %>
</p>

<p>
<b>Memo:</b>
<%= @weight.memo %>
</p>

<%#= link_to 'Edit', edit_weight_path(@weight) %>
<%= link_to 'Edit', edit_user_weight_path(@user, @weight) %>
|
<%#
= link_to 'Back', weights_path %>
<%= link_to 'Back', user_weights_path(@user) %>


これで新規体重を入力したあと確認画面を表示することができる。


Weight editビューをつくる


  1. コードを書く


app/views/weights/edit.html.erb

<h1>Editing weight</h1>

<%= render 'form' %>

<%#= link_to 'Show', @weight %>
<%= link_to 'Show', user_weight_path %>
|
<%#= link_to 'Back', weights_path %>
<%= link_to 'Back', user_weights_path %>


これで入力した体重を変更することができる。

おしまい。


ブログやってます:PAPA-tronix !