Multiple Editors per Node in Drupal 7

This article details a custom Drupal 7 module, editor_list, addressing the limitation of assigning multiple specific users to edit a single node without granting broader access. Drupal's flexible permission system usually suffices, but this module provides a solution for scenarios requiring granular control.

Key Features of the editor_list Module:

• Targeted Node Editing: Allows assigning specific users edit access to individual nodes, regardless of their role's default permissions.
• Helper Functions: Employs editor_list_node_types() to define applicable node types and editor_list_uids_from_list() to retrieve user IDs from a node's editor field.
• Access Control: Utilizes hook_node_access() and hook_field_access() to manage node and field-level access.
• Organized UI: Positions the editor list field within the "Authoring information" section using hook_form_article_node_form_alter.
• Dependency: Requires the Entity Reference module.

The module's core functionality lies in its hook_node_access() implementation. This hook intercepts access attempts, checking if the user is listed as an editor for the specific node. If so, access is granted; otherwise, it's denied. hook_field_access() adds an extra layer of security, preventing editors from modifying the editor list itself, thus maintaining control over who can edit the node.

The module's structure includes:

• editor_list.info: Module metadata, including dependencies.
• editor_list.module: Contains the core logic, including the helper functions and hooks.
• editor_list.install (optional): Handles installation tasks like creating the necessary field (field_editors).

The editor_list_node_types() function specifies which node types the module affects (e.g., 'article'). editor_list_uids_from_list() extracts user IDs from the 'field_editors' field of a given node. The hook_form_alter implementation neatly integrates the editor list field into the node editing form's "Authoring information" section for improved user experience.

This module offers a practical solution for managing granular editing permissions in Drupal 7, enhancing control and flexibility beyond the standard permission system. Remember that users added to the editor list should not have roles granting broader editing permissions to avoid conflicts.

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