set limit

app/admin/emails.rb

@@ -19,4 +19,3 @@ ActiveAdmin.register Email do
     # end
     
   end
-  

app/controllers/messages_controller.rb

@@ -3,9 +3,13 @@ class MessagesController < ApplicationController
 
 
   def create
+    if params[:title].length > 300 ||  params[:name].length > 50 || params[:description].length > 1000
+      render json: {}, status: 400
+    else
       @message = Message.create(message_params)
       render json: {}, status: :created
     end    
+  end
 
   private
   def message_params