Initial Commit

Co-authored-by: Subin <subinthattaparambil@gmail.com>
Co-authored-by: Manoj <manojmj92@gmail.com>
Co-authored-by: Nithin <webofnithin@gmail.com>

app/finders/message_finder.rb

@@ -0,0 +1,20 @@
+class MessageFinder
+  def initialize(conversation, params)
+    @conversation = conversation
+    @params = params
+  end
+
+  def perform
+    current_messages
+  end
+
+  private
+
+  def current_messages
+    if @params[:before].present?
+      @conversation.messages.reorder('created_at desc').where("id < ?", @params[:before]).limit(20).reverse
+    else
+      @conversation.messages.reorder('created_at desc').limit(20).reverse
+    end
+  end
+end