Implement card services for create, update, and destroy actions

app/controllers/cards_controller.rb

@@ -4,12 +4,14 @@ def new
   end
 
   def create
-    @card = Card.new(card_params)
+    service = Cards::CreateCardService.new(params: card_params)
 
     respond_to do |format|
-      if @card.save
+      if service.call
+        @card = service.card
         format.html { redirect_to board_url(@card.board), notice: "Card was successfully created." }
       else
+        @card = service.card
         format.html { render :new, status: :unprocessable_entity }
       end
     end
@@ -21,9 +23,10 @@ def edit
 
   def update
     @card = Card.find(params[:id])
+    service = Cards::UpdateCardService.new(card: @card, params: card_params)
 
     respond_to do |format|
-      if @card.update(card_params)
+      if service.call
         format.html { redirect_to board_url(@card.board_column.board), notice: "Card was successfully updated." }
       else
         format.html { render :edit, status: :unprocessable_entity }
@@ -34,7 +37,7 @@ def update
   def destroy
     @card = Card.find(params[:id])
     board = @card.board_column.board
-    @card.destroy!
+    Cards::DestroyCardService.new(card: @card).call
 
     respond_to do |format|
       format.html { redirect_to board_url(board), notice: "Card was successfully destroyed." }

app/services/cards/create_card_service.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+module Cards
+  class CreateCardService
+    attr_reader :card
+
+    def initialize(params:)
+      @params = params
+    end
+
+    def call
+      @card = Card.new(params)
+
+      ActiveRecord::Base.transaction do
+        card.save!
+      end
+      true
+    rescue ActiveRecord::RecordInvalid
+      false
+    end
+
+    private
+
+    attr_reader :params
+  end
+end

app/services/cards/destroy_card_service.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Cards
+  class DestroyCardService
+    attr_reader :card
+
+    def initialize(card:)
+      @card = card
+    end
+
+    def call
+      ActiveRecord::Base.transaction do
+        card.destroy!
+      end
+      true
+    rescue ActiveRecord::RecordInvalid
+      false
+    end
+  end
+end

app/services/cards/update_card_service.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+module Cards
+  class UpdateCardService
+    attr_reader :card
+
+    def initialize(card:, params:)
+      @card = card
+      @params = params
+    end
+
+    def call
+      ActiveRecord::Base.transaction do
+        card.update!(params)
+      end
+      true
+    rescue ActiveRecord::RecordInvalid
+      false
+    end
+
+    private
+
+    attr_reader :params
+  end
+end

spec/create_card_service_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+RSpec.describe Cards::CreateCardService, type: :service do
+  describe '#call' do
+    it 'creates a new card' do
+      board = create(:board)
+      board_column = create(:board_column, board: board)
+      params = { title: 'Card title', description: 'Card description', board_column_id: board_column.id }
+      service = described_class.new(params: params)
+
+      expect { service.call }.to change { Card.count }.by(1)
+      expect(service.card.title).to eq('Card title')
+    end
+  end
+end

spec/services/cards/destroy_card_service_spec.rb

@@ -0,0 +1,12 @@
+require 'rails_helper'
+
+RSpec.describe Cards::DestroyCardService, type: :service do
+  describe '#call' do
+    it 'destroys a card' do
+      card = create(:card)
+      service = described_class.new(card: card)
+
+      expect { service.call }.to change { Card.count }.by(-1)
+    end
+  end
+end

spec/services/cards/update_card_service_spec.rb

@@ -0,0 +1,18 @@
+require 'rails_helper'
+
+RSpec.describe Cards::UpdateCardService, type: :service do
+  describe '#call' do
+    it 'updates a card' do
+      board = create(:board)
+      board_column1 = create(:board_column, board: board)
+      board_column2 = create(:board_column, board: board)
+      card = create(:card, title: 'Old title', description: 'Old description', board_column: board_column1)
+      params = { title: 'New title', description: 'New description', board_column_id: board_column2.id }
+      service = described_class.new(card: card, params: params)
+
+      expect { service.call }.to change { card.reload.title }.from('Old title').to('New title')
+      expect(card.description).to eq('New description')
+      expect(card.board_column).to eq(board_column2)
+    end
+  end
+end