try046

Part 4: Multi db improvements, Basic API for connection switching
rails/rails#34052

app/assets/stylesheets/dashboard.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the Dashboard controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/dashboard_controller.rb

@@ -0,0 +1,7 @@
+class DashboardController < ApplicationController
+  def index
+    @books = Book.all
+    @users = User.all.to_a
+    @users_in_library = User.all_in_library
+  end
+end

app/helpers/dashboard_helper.rb

@@ -0,0 +1,2 @@
+module DashboardHelper
+end

app/models/book.rb

@@ -0,0 +1,3 @@
+class Book < ApplicationRecord
+  connects_to database: { writing: :library, reading: :library }
+end

app/models/user.rb

@@ -0,0 +1,7 @@
+class User < ApplicationRecord
+  def self.all_in_library
+    ActiveRecord::Base.connected_to(database: :library) do
+      all
+    end
+  end
+end

app/views/dashboard/index.html.erb

@@ -0,0 +1,40 @@
+<h1>Dashboard#index</h1>
+
+<table>
+  <thead>
+    <tr>
+      <th>
+        valiable
+      </th>
+      <th>
+        value
+      </th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>
+        @books
+      </td>
+      <td>
+        <%= @books.map(&:title) %>
+      </td>
+    </tr>
+    <tr>
+      <td>
+        @users
+      </td>
+      <td>
+        <%= @users.map(&:name) %>
+      </td>
+    </tr>
+    <tr>
+      <td>
+        @users_in_library
+      </td>
+      <td>
+        <%= @users_in_library.map(&:name) %>
+      </td>
+    </tr>
+  </tbody>
+</table>

config/routes.rb

@@ -1,3 +1,4 @@
 Rails.application.routes.draw do
+  get 'dashboard/index'
   # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
 end

db/library_migrate/20190629000054_create_user.rb

@@ -0,0 +1,7 @@
+class CreateUser < ActiveRecord::Migration[6.0]
+  def change
+    create_table :users do |t|
+      t.string :name
+    end
+  end
+end

db/library_schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_06_08_225808) do
+ActiveRecord::Schema.define(version: 2019_06_29_000054) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -19,4 +19,8 @@
     t.string "title"
   end
 
+  create_table "users", force: :cascade do |t|
+    t.string "name"
+  end
+
 end

db/seeds.rb

@@ -1,7 +1,7 @@
-# This file should contain all the record creation needed to seed the database with its default values.
-# The data can then be loaded with the rails db:seed command (or created alongside the database with db:setup).
-#
-# Examples:
-#
-#   movies = Movie.create([{ name: 'Star Wars' }, { name: 'Lord of the Rings' }])
-#   Character.create(name: 'Luke', movie: movies.first)
+User.create(name: 'Taro')
+
+ActiveRecord::Base.connected_to(database: :library) do
+  User.create(name: 'Hanako')
+end
+
+Book.create(title: 'Programming Ruby')

test/controllers/dashboard_controller_test.rb

@@ -0,0 +1,9 @@
+require 'test_helper'
+
+class DashboardControllerTest < ActionDispatch::IntegrationTest
+  test "should get index" do
+    get dashboard_index_url
+    assert_response :success
+  end
+
+end