Feature: Operation generator

README.md

@@ -22,7 +22,7 @@ rails db:migrate
 
 ### 1. Define an Operation
 
-Create operation classes that inherit from `ApplicationOperation`:
+Generate an operation class by running `rails generate active_operator:operation [name]`.
 
 ```ruby
 class Geocoding::V1 < ApplicationOperation

lib/generators/active_operator/operation_generator.rb

@@ -0,0 +1,31 @@
+require 'rails/generators'
+require 'active_support/inflector'
+
+module ActiveOperator
+  module Generators
+    class OperationGenerator < Rails::Generators::NamedBase
+      include Rails::Generators::ResourceHelpers
+
+      check_class_collision suffix: "Operation"
+
+      source_root File.expand_path("templates", __dir__)
+
+      desc "Generates an operation with the given NAME."
+
+      def create_operation_file
+        template "operation.rb.erb", "app/operations/#{operation_file_path}_operation.rb"
+      end
+
+      private
+
+      def file_name
+        @_file_name ||= super.sub(/_operation\z/i, "")
+      end
+
+      def operation_file_path
+        name.underscore.sub(/_operation\z/i, "")
+      end
+
+    end
+  end
+end

lib/generators/active_operator/templates/operation.rb.erb

@@ -0,0 +1,22 @@
+class <%= class_name %>Operation < ApplicationOperator
+  def request
+    # faraday.get(
+    #   "https://api.geocod.io/v1.8/geocode",
+    #   {
+    #     q: record.address,
+    #     api_key: Rails.application.credentials.dig(:geocodio, :api_key),
+    #     fields: "timezone"
+    #   }
+    # )
+  end
+
+  def process
+    # result = response.dig("body", "results", 0)
+
+    # record.update!(
+    #   latitude: result.dig("location", "lat"),
+    #   longitude: result.dig("location", "lng"),
+    #   timezone: result.dig("fields", "timezone", "name")
+    # )
+  end
+end

test/generators/active_operator/operation_generator_test.rb

@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+require "rails/generators"
+require "generators/active_operator/operation_generator"
+
+module ActiveOperator
+  module Generators
+    class OperationGeneratorTest < Rails::Generators::TestCase
+      tests ActiveOperator::Generators::OperationGenerator
+
+      destination File.expand_path("../../tmp", __dir__)
+      setup :prepare_destination
+
+      def after_teardown
+        FileUtils.rm_rf destination_root
+        super
+      end
+
+      test "should generate operation file with simple name" do
+        run_generator ["user"]
+
+        assert_file "app/operations/user_operation.rb"
+
+        operation_contents = File.read(File.join(destination_root, "app/operations/user_operation.rb"))
+        assert_match "class UserOperation < ApplicationOperator", operation_contents
+        assert_match "def request", operation_contents
+        assert_match "def process", operation_contents
+      end
+
+      test "should generate operation file with nested directories" do
+        run_generator ["geocode/v1/pull"]
+
+        assert_file "app/operations/geocode/v1/pull_operation.rb"
+
+        operation_contents = File.read(File.join(destination_root, "app/operations/geocode/v1/pull_operation.rb"))
+        assert_match "class Geocode::V1::PullOperation < ApplicationOperator", operation_contents
+      end
+
+      test "should generate operation file with deeply nested directories" do
+        run_generator ["api/v2/users/profile/update"]
+
+        assert_file "app/operations/api/v2/users/profile/update_operation.rb"
+
+        operation_contents = File.read(File.join(destination_root, "app/operations/api/v2/users/profile/update_operation.rb"))
+        assert_match "class Api::V2::Users::Profile::UpdateOperation < ApplicationOperator", operation_contents
+      end
+
+      test "should handle operation suffix correctly" do
+        run_generator ["user_operation"]
+
+        assert_file "app/operations/user_operation.rb"
+
+        operation_contents = File.read(File.join(destination_root, "app/operations/user_operation.rb"))
+        assert_match "class UserOperation < ApplicationOperator", operation_contents
+      end
+
+      test "should handle nested operation with operation suffix" do
+        run_generator ["geocode/v1/pull_operation"]
+
+        assert_file "app/operations/geocode/v1/pull_operation.rb"
+
+        operation_contents = File.read(File.join(destination_root, "app/operations/geocode/v1/pull_operation.rb"))
+        assert_match "class Geocode::V1::PullOperation < ApplicationOperator", operation_contents
+      end
+    end
+  end
+end