Feat: Add support to Action Text enabled content

lib/ruby_llm/active_record/acts_as.rb

@@ -353,9 +353,15 @@ def extract_tool_call_id
       end
 
       def extract_content
-        return content unless respond_to?(:attachments) && attachments.attached?
+        text_content = if content.respond_to?(:to_plain_text)
+                         content.to_plain_text
+                       else
+                         content.to_s
+                       end
 
-        RubyLLM::Content.new(content).tap do |content_obj|
+        return text_content unless respond_to?(:attachments) && attachments.attached?
+
+        RubyLLM::Content.new(text_content).tap do |content_obj|
           @_tempfiles = []
 
           attachments.each do |attachment|

spec/dummy/config/application.rb

@@ -7,6 +7,7 @@
 require 'active_record/railtie'
 require 'active_storage/engine'
 require 'action_controller/railtie'
+require 'action_text/engine'
 
 Bundler.require(*Rails.groups)
 require 'ruby_llm'

spec/ruby_llm/active_record/acts_as_spec.rb

@@ -378,6 +378,29 @@ class BotToolCall < ActiveRecord::Base # rubocop:disable Lint/ConstantDefinition
     end
   end
 
+  describe 'Action Text content support' do
+    it 'converts Action Text content to plain text' do
+      chat = Chat.create!(model_id: model)
+      action_text_content = instance_double(ActionText::RichText)
+      allow(action_text_content).to receive(:to_plain_text).and_return('This is rich text content')
+
+      message = chat.messages.create!(role: 'user')
+      allow(message).to receive(:content).and_return(action_text_content)
+
+      llm_message = message.to_llm
+
+      expect(action_text_content).to have_received(:to_plain_text)
+      expect(llm_message.content).to eq('This is rich text content')
+    end
+
+    it 'handles regular string content when to_plain_text is not available' do
+      chat = Chat.create!(model_id: model)
+      message = chat.messages.create!(role: 'user', content: 'Regular text content')
+      llm_message = message.to_llm
+      expect(llm_message.content).to eq('Regular text content')
+    end
+  end
+
   describe 'attachment handling' do
     let(:image_path) { File.expand_path('../../fixtures/ruby.png', __dir__) }
     let(:pdf_path) { File.expand_path('../../fixtures/sample.pdf', __dir__) }