feat(entry): allow to use instance method, just like field in graphql…

…-ruby

lib/convenient_service/examples/dry/gemfile.rb

@@ -16,7 +16,9 @@ module Dry
       class Gemfile
         include ConvenientService::Feature::Standard::Config
 
-        entry :format do |path|
+        entry :format
+
+        def format(path)
           Services::Format[path: path]
         end
       end

lib/convenient_service/examples/dry/v1/gemfile.rb

@@ -17,7 +17,9 @@ module V1
         class Gemfile
           include ConvenientService::Feature::Standard::Config
 
-          entry :format do |path|
+          entry :format
+
+          def format(path)
             Services::Format[path: path]
           end
         end

lib/convenient_service/examples/rails/gemfile.rb

@@ -16,7 +16,9 @@ module Rails
       class Gemfile
         include ConvenientService::Feature::Standard::Config
 
-        entry :format do |path|
+        entry :format
+
+        def format(path)
           Services::Format[path: path]
         end
       end

lib/convenient_service/examples/rails/v1/gemfile.rb

@@ -17,7 +17,9 @@ module V1
         class Gemfile
           include ConvenientService::Feature::Standard::Config
 
-          entry :format do |path|
+          entry :format
+
+          def format(path)
             Services::Format[path: path]
           end
         end

lib/convenient_service/examples/standard/cowsay.rb

@@ -15,7 +15,9 @@ module Standard
       class Cowsay
         include ConvenientService::Feature::Standard::Config
 
-        entry :print do |text = "Hello World!", out: $stdout|
+        entry :print
+
+        def print(text = "Hello World!", out: $stdout)
           Services::Print[text: text, out: out]
         end
       end

lib/convenient_service/examples/standard/date_time.rb

@@ -14,7 +14,9 @@ module Standard
       class DateTime
         include ConvenientService::Feature::Standard::Config
 
-        entry :safe_parse do |string, format|
+        entry :safe_parse
+
+        def safe_parse(string, format)
           Services::SafeParse[string: string, format: format]
         end
       end

lib/convenient_service/examples/standard/factorial.rb

@@ -15,7 +15,9 @@ module Standard
       class Factorial
         include ConvenientService::Feature::Standard::Config
 
-        entry :calculate do |number|
+        entry :calculate
+
+        def calculate(number)
           Services::Calculate[number: number]
         end
       end

lib/convenient_service/examples/standard/gemfile.rb

@@ -15,7 +15,9 @@ module Standard
       class Gemfile
         include ConvenientService::Feature::Standard::Config
 
-        entry :format do |path|
+        entry :format
+
+        def format(path)
           Services::Format[path: path]
         end
       end

lib/convenient_service/examples/standard/request_params.rb

@@ -39,7 +39,9 @@ module Standard
       class RequestParams
         include ConvenientService::Feature::Standard::Config
 
-        entry :prepare do |request|
+        entry :prepare
+
+        def prepare(request)
           Services::Prepare[request: request]
         end
       end

lib/convenient_service/feature/plugins/can_have_entries.rb

@@ -2,3 +2,4 @@
 
 require_relative "can_have_entries/commands"
 require_relative "can_have_entries/concern"
+require_relative "can_have_entries/exceptions"

lib/convenient_service/feature/plugins/can_have_entries/commands/define_entry.rb

@@ -47,7 +47,11 @@ def call
                 define_singleton_method(name) { |*args, **kwargs, &block| new.public_send(name, *args, **kwargs, &block) }
               end
 
-              feature_class.define_method(name, &body)
+              if body
+                feature_class.define_method(name, &body)
+              else
+                feature_class.define_method(name) { raise ::ConvenientService::Feature::Plugins::CanHaveEntries::Exceptions::NotDefinedEntryMethod.new(name: __method__, feature: self) }
+              end
 
               name
             end

lib/convenient_service/feature/plugins/can_have_entries/concern.rb

@@ -10,7 +10,7 @@ module Concern
           class_methods do
             ##
             # @param name [String, Symbol]
-            # @param body [Proc]
+            # @param body [Proc, nil]
             # @return [String, Symbol]
             #
             def entry(name, &body)

lib/convenient_service/feature/plugins/can_have_entries/exceptions.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+module ConvenientService
+  module Feature
+    module Plugins
+      module CanHaveEntries
+        module Exceptions
+          class NotDefinedEntryMethod < ::ConvenientService::Exception
+            def initialize(name:, feature:)
+              message = <<~TEXT
+                Entry for `#{name}` is registered inside `#{feature.class}` feature, but its corresponding method is NOT defined.
+
+                Did you forget to define it? For example:
+
+                class #{feature.class}
+                  entry :#{name}
+
+                  # ...
+
+                  def #{name}
+                    # ...
+                  end
+
+                  # ...
+                end
+              TEXT
+
+              super(message)
+            end
+          end
+        end
+      end
+    end
+  end
+end