Add use cases for creating and destroying reactions

lib/use_case/reaction/create.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module UseCase
+  module Reaction
+    class Create < UseCase::Base
+      option :source_user, type: Types.Instance(::User)
+      option :target, type: Types.Instance(::Answer) | Types.Instance(::Comment)
+      option :content, type: Types::Coercible::String, optional: true
+
+      def call
+        reaction = source_user.smile target
+
+        {
+          status:   201,
+          resource: reaction,
+        }
+      end
+    end
+  end
+end

lib/use_case/reaction/destroy.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module UseCase
+  module Reaction
+    class Destroy < UseCase::Base
+      option :source_user, type: Types.Instance(::User)
+      option :target, type: Types.Instance(::Answer) | Types.Instance(::Comment)
+
+      def call
+        source_user.unsmile target
+
+        {
+          status:   204,
+          resource: nil,
+        }
+      end
+    end
+  end
+end