event モデルの作成 - 不定期刊 Rails App を作る(35)

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この記事は Middleman 時代に書いた古いものです。記録のため、astro-notion-blog に移行していますが、あまり参考にしないでください。

いよいよ最後のモデルを追加する．

event_gakusei モデルの追加

generator で event モデルを作成する．

$ bin/rails g model event_gakusei event_id:integer gakusei_id:integer shusseki:integer
Running via Spring preloader in process 90585
      invoke  active_record
      create    db/migrate/20181223210805_create_event_gakuseis.rb
      create    app/models/event_gakusei.rb
      invoke    rspec
      create      spec/models/event_gakusei_spec.rb
      invoke      factory_bot
      create        spec/factories/event_gakuseis.rb

db/migrate/*_create_event_gakuseis.rb を修正する．各属性は null: false にすることと，event_id, gakusei_id の組に index を付けると共に，plural unique を設定する．

class CreateEventGakuseis < ActiveRecord::Migration[5.2]
  def change
    create_table :event_gakuseis do |t|
      t.integer :event_id, null: false
      t.integer :gakusei_id, null: false
      t.integer :shusseki, null: false
      t.timestamps
    end
    add_index :event_gakuseis, %i[event_id gakusei_id], unique: true
  end
end

migrate する
```
bin/rails db:migrate
```

event_spec の記述

spec/models/event_gakusei_spec.rb を修正する．

require 'rails_helper'

RSpec.describe EventGakusei, type: :model do

  context 'common validation check' do
    subject { event_gakusei_factory :start_foo }

    it_behaves_like :presence_validates, %i[event_id gakusei_id shusseki]
    #it_behaves_like :unique_validates, %i[], -> { event_gakusei_factory :other }
    it_behaves_like :plural_unique_validates, %i[event_id gakusei_id], -> { event_gakusei_factory :hr_bar2302 }
    it_behaves_like :destroy_validates
    #it_behaves_like :reject_destroy_validates
    it_behaves_like :belongs_to, :event_gakusei, has_many: %i[event gakusei]
    it_behaves_like :dependent_destroy, :event_gakusei, %i[event gakusei]
    #it_behaves_like :reject_destroy_for_relations, :event_gakusei, %i[has_many has_one]
    #it_behaves_like :destroy_nullify_for_relations, :event_gakusei, %i[has_many has_one]
  end

  context 'after some event_gakuseis are registrered' do
    model_keys = %i[hr_baz3301 hr_bar2302 start_foo]
    let!(:targets) { event_gakusei_factories model_keys }

    describe 'EventGakusei class' do
      subject { EventGakusei }

      it_behaves_like :mst_block, -> t do
        {
          order_number: [nil, t.reverse],
        }
      end

      #it_behaves_like :msta_block, -> t do
      #  {
      #    method1: [v1, a1, v2, a2, ...],
      #    method2: [v1, a1, v2, a2, ...],
      #  }
      #end
      #it_behaves_like :mst, :METHOD1, -> { [v1, event_gakusei_factories(model_keys.values_at()), v2, event_gakusei_factories(model_keys.values_at())] }
      #it_behaves_like :msta, :METHOD1, -> { [v1, event_gakusei_factories(model_keys.values_at()), v2, event_gakusei_factories(model_keys.values_at())] }
    end

    context 'EventGakusei instances' do
      subject { targets }

      #it_behaves_like :amst_block, -> t do
      #  {
      #    method1: [v1, a1, v2, a2, ...],
      #    method2: [v1, a1, v2, a2, ...],
      #  }
      #end
      #
      #it_behaves_like :amsta_block, -> t do
      #  {
      #    method1: [v1, a1, v2, a2, ...],
      #    method2: [v1, a1, v2, a2, ...],
      #  }
      #end
      #it_behaves_like :amst, :METHOD1, -> { [v1, a1, v2, a2] }
      #it_behaves_like :amsta, :METHOD1, -> { [v1, a1, v2, a2] }
    end
  end
end

event_gakusei model の記述

app/models/event_gakusei.rb を記載する．これまでと異なるのは，shusseki を enum に設定したことである．この属性には :unsettled, :shusseki, :kesseki の値しか入らない(データベースには integer の数値が入る)．

class EventGakusei < ApplicationRecord
  enum shusseki: {unsettled: 0, shusseki: 1, kesseki: 2}
  validates :event_id, :gakusei_id, :shusseki, presence: true
  validates :gakusei_id, uniqueness: {scope: :event_id}

  # @return [Event] 関連するイベント
  belongs_to :event
  # @return [Gakusei] 関連するイベント
  belongs_to :gakusei

  scope :order_number, -> { joins(:gakusei).merge(Gakusei.order_number) }

end

関連する app/models/event.rb に has_many を追加する．
同様に関連する app/models/gakusei.rb に has_many を追加する．

guard の結果は以下のようになった．

EventGakusei
  common validation check
    behaves like presence_validates
      should be valid
      when event_id is nil
        should not be valid
      when gakusei_id is nil
        should not be valid
      when shusseki is nil
        should not be valid
    behaves like plural_unique_validates
      when another object has same event_id, gakusei_id
        should not be valid
      when another object has at least one different keys(event_id, gakusei_id)
        should be valid
    behaves like destroy_validates
      should destroy
        should change `EventGakusei.count` by -1
    behaves like belongs_to
      when destroying event_gakusei
        event.event_gakuseis.count should decrease
        gakusei.event_gakuseis.count should decrease
    behaves like dependent_destroy
      when destroying event
        should be destroyed by dependency
      when destroying gakusei
        should be destroyed by dependency
  after some event_gakuseis are registrered
    EventGakusei class
      behaves like mst_block
mst: order_number
        should receive above methods(mst)

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12 examples, 0 failures

長くなったので今日はここまで