feat: Ability to edit a contact (#1092)

Ability to edit contact information in conversation sidebar

Co-authored-by: Sojan <sojan@pepalo.com>

app/models/contact.rb

@@ -38,7 +38,7 @@ class Contact < ApplicationRecord
   has_many :inboxes, through: :contact_inboxes
   has_many :messages, as: :sender, dependent: :destroy
 
-  before_validation :downcase_email
+  before_validation :prepare_email_attribute
   after_create_commit :dispatch_create_event
   after_update_commit :dispatch_update_event
 
@@ -69,9 +69,9 @@ class Contact < ApplicationRecord
     }
   end
 
-  private
-
-  def downcase_email
+  def prepare_email_attribute
+    # So that the db unique constraint won't throw error when email is ''
+    self.email = nil if email.blank?
     email.downcase! if email.present?
   end