ドットインストール「Ruby on Rails 4入門」メモ ref: http://qiita.com/keisukeohta/items/c31a9d8e496dda859d55

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rails new myapp

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cd myapp/

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rails s

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localhost:3000/users

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control+C

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cd ..

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rails new taskapp --skip-bundle

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cd taskapp

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vi Gemfile

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esc => :wq

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rails s

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localhost:3000

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rails s

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control+C

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rails g model Project title:string #gはgenerateの略

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rake db:migrate

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rails db

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.schema

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.exit

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rails console

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p = Project.new(title: "p1")

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p.save

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p

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vi Gemfile

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Project.create(title: "p2")

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Project.all

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rails db

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select * from projects;

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rails g controller Projects

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rake routes

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class ProjectsController < ApplicationController
    def index
        @projects = Project.all #viewの中でそのまま使える
    end
end

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<h1>Projects</h1>
<u1>
    <% @projects.each do |project| %>
    <li><%= project.title %></li>
    <% end %>
</u1>

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rails s

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localhost:3000/projects

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# gem 'therubyracer', platforms: ruby

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<%= image_tag "logo.png" %>

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body { background: #eee;}

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<h1>Projects</h1>
<u1>
    <% @projects.each do |project| %>
    <li><%= link_to project.title, project_path(project.id) %></li>
    <% end %>
</u1>

file43.txt

class ProjectsController < ApplicationController
    def index
        @projects = Project.all #viewの中でそのまま使える
    end
    def show
        @Project = Project.find(params[:id]) #URLで渡ってきた数字はparamsで取ってこれる。シンボルはroutesに書かれているid。
    end
end

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<h1><%= @project.title %></h1>

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<p><%= link_to "Add New", new_project_path %></p>

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    def new
        @project = Project.new
    end

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<h1>Add New</h1>
<%= form_for @project do |f| %>
<p>
    <%= f.label :title %><br>
    <%= f.text_field :title %>
</p>
<p>
    <%= f.submit %>
</p>
<% end %>

file48.txt

    def create
        @project = Project.new(project_params)
        @project.save
        redirect_to projects_path
    end
    private
        def project_params #project_paramsについてはprivate関数で定義するのが代表的な手法           params[:project].permit[:title] #projectで渡ってきた中の物のうち、タイトルだけを引っ張ってきてねという意味。セキュリティ上、フォームから渡ってきたものについてプロジェクトとタイトルだけ必要という時はこういうふうにフィルタリングをかけるのが最近のやり方。
        end

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validates :title, presence: true

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bundle install

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    def create
        @project = Project.new(project_params)
        if @project.save
            redirect_to projects_path
        else
            render 'new' #newのviewに戻る
        end
    end

file51.txt

<h1>Add New</h1>
<%= form_for @project do |f| %>
<p>
    <%= f.label :title %><br>
    <%= f.text_field :title %>
    <% if @project.errors.any? %> <%# project.errorsにエラーがあるかどうかで条件分岐 %>
    <%= @project.errors.inspect %>
    <% end %>
</p>
<p>
    <%= f.submit %>
</p>
<% end %>

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messages[:title][0]

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class Project < ActiveRecord::Base
    validates :title, presence: {message: "入力してください"}
end

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class Project < ActiveRecord::Base
    validates :title,
    presence: {message: "入力してください"},
    length: {minimum: 3, message: "短すぎ！"}
end

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<%= link_to "[edit]", edit_project_path(project.id) %>

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    def edit
        @project = Project.find(params[:id])
    end

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<h1>Edit</h1>
<%= form_for @project do |f| %>
<p>
    <%= f.label :title %><br>
    <%= f.text_field :title %>
    <% if @project.errors.any? %> <%# project.errorsにエラーがあるかどうかで条件分岐 %>
    <%= @project.errors.messages[:title][0] %> <%# :titleをキーにして配列の0番目を表示 %>
    <% end %>
</p>
<p>
    <%= f.submit %>
</p>
<% end %>

file58.txt

    def update
        @project = Project.find(params[:id])
        if @project.update(project_params)
            redirect_to projects_path
        else
            render 'edit'
        end
    end

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<%= render 'form' %>

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rails s

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<%= form_for @project do |f| %>
<p>
    <%= f.label :title %><br>
    <%= f.text_field :title %>
    <% if @project.errors.any? %> <%# project.errorsにエラーがあるかどうかで条件分岐 %>
    <%= @project.errors.messages[:title][0] %> <%# :titleをキーにして配列の0番目を表示 %>
    <% end %>
</p>
<p>
    <%= f.submit %>
</p>
<% end %>

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<h1>Add New</h1>
<%= render 'form' %>

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<%= link_to "[Delete]", project_path(project.id), method: delete, data: { confirm: "are you sure?" } %>

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    def destroy
        @project = Project.find(params[:id])
        @project.destroy
        redirect_to projects_path
    end

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@project = Project.find(params[:id])

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before_action :set_project, only: [:show, :edit, :update, :destroy]

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        def set_project
            @project = Project.find(params[:id])
        end

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control+C

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rails g model Task title done:boolean project:references

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t.boolean :done, default: false

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localhost:3000

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rails g controller Tasks

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has_many :tasks

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resources :projects do
    resources :tasks, only: [:create, :destroy]
  end

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rake routes

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rails s

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<h1><%= @project.title %></h1>
<u1>
<% @project.tasks.each do |task| %>
<li><%= task.title %></li>
<% end %>
<li>
    <%= form_for [@project, @project.tasks.build] do |f| %>
    <%= f.text_field :title %>
    <%= f.submit %>
    <% end %>
</li>
</u1>

file76.txt

class TasksController < ApplicationController
    def create
        @project = Project.find(params[:project_id])
        @task = @project.tasks.create(task_params)
        redirect_to project_path(@project.id)
    end
    private
        def task_params
        params[:task].permit(:title)
        end
end

file77.txt

class Task < ActiveRecord::Base
  belongs_to :project
  validates :title, presence: true
end

file78.txt

<h1><%= @project.title %></h1>
<u1>
<% @project.tasks.each do |task| %>
<li>
    <%= task.title %>
    <%= link_to "[Delete]", project_task_path(task.project_id, task.id), method: :delete, data: { confirm: "are you sure?" } %>
</li>
<% end %>
<li>
    <%= form_for [@project, @project.tasks.build] do |f| %>
    <%= f.text_field :title %>
    <%= f.submit %>
    <% end %>
</li>
</u1>

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    def destroy
        @task = Task.find(params[:id])
        @task.destroy
        redirect_to project_path(params[:project_id])
    end

file8.txt

rails generate scaffold User name:string score:integer

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<%= check_box_tag '', '', task.done, {'data-id' => task.id, 'data-project_id' => task.project_id} %>

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<script>
    $(function(){
        $("input[type=checkbox]").click(function(){
            $.post('/projects/'+$(this).data('project_id')+'/tasks/'+$(this).data('id')+'/toggle');
        });
    })
</script>

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post '/projects/:project_id/tasks/:id/toggle' => 'tasks#toggle'

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    def toggle
        @task = Task.find(params[:id])
        @task.done = !@task.done
        @task.save
    end

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render nothing: true

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<%= link_to project.title, project_path(project.id) %> (<%= project.tasks.count %>)

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<%= link_to project.title, project_path(project.id) %> (<%= project.tasks.unfinished.count %>/<%= project.tasks.count %>)

file9.txt

rake db:migrate