Add store_if_blank option to has_rich_text

actiontext/CHANGELOG.md

@@ -1,3 +1,19 @@
+*   Add `store_if_blank` option to `has_rich_text`
+
+    Pass `store_if_blank: false` to not create `ActionText::RichText` records when saving with a blank attribute, such as from an optional form parameter.
+
+    ```ruby
+    class Message
+      has_rich_text :content, store_if_blank: false
+    end
+
+    Message.create(content: "hi") # creates an ActionText::RichText
+    Message.create(content: "") # does not create an ActionText::RichText
+    ```
+
+    *Alex Ghiculescu*
+
+
 *   Rename `rich_text_area` methods into `rich_textarea`
 
     Old names are still available as aliases.

actiontext/lib/action_text/attribute.rb

@@ -41,13 +41,16 @@ module Attribute
       #     `strict_loading:` will be set to the value of the
       #     `strict_loading_by_default` class attribute (false by default).
       #
+      # *   `:store_if_blank` - Pass false to not create RichText records with empty values,
+      #     if a blank value is provided. Default: true.
+      #
       #
       # Note: Action Text relies on polymorphic associations, which in turn store
       # class names in the database. When renaming classes that use `has_rich_text`,
       # make sure to also update the class names in the
       # `action_text_rich_texts.record_type` polymorphic type column of the
       # corresponding rows.
-      def has_rich_text(name, encrypted: false, strict_loading: strict_loading_by_default)
+      def has_rich_text(name, encrypted: false, strict_loading: strict_loading_by_default, store_if_blank: true)
         class_eval <<-CODE, __FILE__, __LINE__ + 1
           def #{name}
             rich_text_#{name} || build_rich_text_#{name}
@@ -56,12 +59,26 @@ def #{name}
           def #{name}?
             rich_text_#{name}.present?
           end
-
-          def #{name}=(body)
-            self.#{name}.body = body
-          end
         CODE
 
+        if store_if_blank
+          class_eval <<-CODE, __FILE__, __LINE__ + 1
+            def #{name}=(body)
+              self.#{name}.body = body
+            end
+          CODE
+        else
+          class_eval <<-CODE, __FILE__, __LINE__ + 1
+            def #{name}=(body)
+              if body.present?
+                self.#{name}.body = body
+              else
+                self.#{name}.mark_for_destruction if #{name}?
+              end
+            end
+          CODE
+        end
+
         rich_text_class_name = encrypted ? "ActionText::EncryptedRichText" : "ActionText::RichText"
         has_one :"rich_text_#{name}", -> { where(name: name) },
           class_name: rich_text_class_name, as: :record, inverse_of: :record, autosave: true, dependent: :destroy,

actiontext/test/dummy/app/models/message_without_blanks.rb

@@ -0,0 +1,5 @@
+class MessageWithoutBlanks < ApplicationRecord
+  self.table_name = Message.table_name
+
+  has_rich_text :content, store_if_blank: false
+end

actiontext/test/unit/model_test.rb

@@ -16,21 +16,25 @@ class ActionText::ModelTest < ActiveSupport::TestCase
   end
 
   test "without content" do
-    message = Message.create!(subject: "Greetings")
-    assert_predicate message.content, :nil?
-    assert_predicate message.content, :blank?
-    assert_predicate message.content, :empty?
-    assert_not message.content?
-    assert_not message.content.present?
+    assert_difference("ActionText::RichText.count" => 0) do
+      message = Message.create!(subject: "Greetings")
+      assert_predicate message.content, :nil?
+      assert_predicate message.content, :blank?
+      assert_predicate message.content, :empty?
+      assert_not message.content?
+      assert_not message.content.present?
+    end
   end
 
   test "with blank content" do
-    message = Message.create!(subject: "Greetings", content: "")
-    assert_not message.content.nil?
-    assert_predicate message.content, :blank?
-    assert_predicate message.content, :empty?
-    assert_not message.content?
-    assert_not message.content.present?
+    assert_difference("ActionText::RichText.count" => 1) do
+      message = Message.create!(subject: "Greetings", content: "")
+      assert_not message.content.nil?
+      assert_predicate message.content, :blank?
+      assert_predicate message.content, :empty?
+      assert_not message.content?
+      assert_not message.content.present?
+    end
   end
 
   test "embed extraction" do
@@ -123,4 +127,29 @@ class ActionText::ModelTest < ActiveSupport::TestCase
       assert_equal "Body", message.body.to_plain_text
     end
   end
+
+  test "with blank content and store_if_blank: false" do
+    assert_difference("ActionText::RichText.count" => 0) do
+      message = MessageWithoutBlanks.create!(subject: "Greetings", content: "")
+      assert_predicate message.content, :nil?
+      assert_predicate message.content, :blank?
+      assert_predicate message.content, :empty?
+      assert_not message.content?
+      assert_not message.content.present?
+    end
+  end
+
+  test "if allowing blanks, updates rich text record on edit" do
+    message = Message.create!(subject: "Greetings", content: "content")
+    assert_difference("ActionText::RichText.count" => 0) do
+      message.update(content: "")
+    end
+  end
+
+  test "if disallowing blanks, deletes rich text record on edit" do
+    message = MessageWithoutBlanks.create!(subject: "Greetings", content: "content")
+    assert_difference("ActionText::RichText.count" => -1) do
+      message.update(content: "")
+    end
+  end
 end