Support for inviting to a forum from a user's invite page.

app/models/invite.rb

@@ -44,6 +44,30 @@ class Invite < ActiveRecord::Base
     InviteRedeemer.new(self).redeem unless expired? || destroyed?
   end
 
+
+  # Create an invite for a user, supplying an optional topic
+  #
+  # Return the previously existing invite if already exists. Returns nil if the invite can't be created.
+  def self.invite_by_email(email, invited_by, topic=nil)
+    lower_email = Email.downcase(email)
+    invite = Invite.with_deleted.where('invited_by_id = ? and email = ?', invited_by.id, lower_email).first
+
+    if invite.blank?
+      invite = Invite.create(invited_by: invited_by, email: lower_email)
+      unless invite.valid?
+        topic.grant_permission_to_user(lower_email) if topic.present? && topic.email_already_exists_for?(invite)
+        return
+      end
+    end
+
+    # Recover deleted invites if we invite them again
+    invite.recover! if invite.deleted_at.present?
+
+    topic.topic_invites.create(invite_id: invite.id) if topic.present?
+    Jobs.enqueue(:invite_email, invite_id: invite.id)
+    invite
+  end
+
 end
 
 # == Schema Information