AI chat layout skeleton

app/controllers/messages_controller.rb

@@ -0,0 +1,18 @@
+class MessagesController < ApplicationController
+  before_action :set_chat
+
+  def create
+    @message = @chat.messages.create!(message_params.merge(role: "user"))
+
+    redirect_to chat_path(@chat)
+  end
+
+  private
+    def set_chat
+      @chat = Current.user.chats.find(params[:chat_id])
+    end
+
+    def message_params
+      params.require(:message).permit(:content)
+    end
+end