helenaeksler / message_subscribe

https://www.drupal.org/project/message_subscribe

Message-subscribe provides a subscription system on top of Flag and Message-notify; providing a scalable solution for sending mass messages (e.g. emails) as-well.

MAIN CONCEPTS

1. Every flag that is prefixed with "subscribe_" is considered a valid subscring-flag by this module. You can add as many flags as you wish.
2. It is up to the the implementing module to create the Message entity, and pass it along to message_subscribe_send_message(). From there message-subscribe takes care of saving it, and sending it to the subscribed users.
3. Getting the "subscribers" is a two step process:
   • Extract the "basic context" from the given entity. For example, on the event of creating a new node, the implementing module will pass the node entity, where the Message-subscribe will add to the "context" the node-author, any taxonomy term the node is related to, and if OG module is enabled all the groups the node belongs to. Note: Implementing modules may pass their own custom context instead.
   • After we have the context (i.e. an array keyed by the entity-type and array of entity IDs as value), we iterate over it and query the {flag} table to get all the users that have flaggings on those items. Note: Implementing modules may later alter the retrieved list.

Sponsored by Acquia; Developed by Gizra