Domain Path Pathauto

Domain Path Pathauto integrates Pathauto with Domain Path so that automatic URL aliases are generated per domain. When enabled, each domain path field gains a Generate automatic URL alias checkbox, and Pathauto patterns are applied independently for every domain the entity is published to.

Requirements

• Domain Path (parent module)
• Pathauto

Installation

Enable the module:

drush en domain_path_pathauto

The module sets its weight to 11 (one above Pathauto's weight of 10) to ensure it runs after Pathauto during entity operations.

How it works

Per-domain automatic aliases

Without this submodule, Pathauto generates a single alias per entity per language. Domain Path Pathauto extends this so that each domain gets its own automatically generated alias:

Domain	Pathauto result
example.com	/news/my-article
blog.example.com	/news/my-article

The alias pattern is the same (since Pathauto patterns are not domain-specific), but uniqueness is enforced per domain. If /news/my-article is already taken on blog.example.com by a different entity, the alias becomes /news/my-article-0.

The pathauto checkbox

Each domain path field in the entity form gains a checkbox:

Generate automatic URL alias for example.com

• Checked (default for new entities) — Pathauto generates the alias; the alias text field is disabled.
• Unchecked — the alias text field is editable and Pathauto will not override it.

This state is tracked per domain, per entity. You can have automatic aliases on some domains and manual aliases on others for the same node.

State persistence

The pathauto state (automatic vs. manual) is stored in the key-value store with domain-scoped collections:

domain_path_pathauto_state.{domain_id}.{entity_type}

This ensures that toggling pathauto on one domain does not affect other domains.

Architecture

Service decorators

The submodule decorates two Pathauto services:

Decorator	Decorates	Purpose
domain_path_pathauto.generator	pathauto.generator	Intercepts updateEntityAlias() to generate aliases for each domain
domain_path_pathauto.alias_storage_helper	pathauto.alias_storage_helper	Adds loadBySourceAndDomain() and domain-aware save()

Additionally, a standalone service handles domain-scoped uniqueness:

Service	Purpose
domain_path_pathauto.alias_uniquifier	Ensures aliases are unique within a domain (appends -0, -1, etc.)

Field type and widget overrides

The submodule uses hook_field_info_alter() and hook_field_widget_info_alter() to replace the domain_path field classes:

Original class	Replaced by	Added behavior
DomainPathItem	DomainPathautoItem	Adds pathauto property; skips parent postSave() when pathauto is active
DomainPathFieldItemList	DomainPathautoFieldItemList	Initializes pathauto state on new entities; purges state on delete
DomainPathWidget	DomainPathautoWidget	Adds per-domain pathauto checkbox

Alias generation flow

When an entity is saved with pathauto enabled for a domain:

1. DomainPathautoGenerator::updateEntityAlias() is called.
2. It delegates to the inner generator for the default (non-domain) alias.
3. It calls updateEntityDomainAlias(), which iterates domain_path field items.
4. For each item where pathauto state is CREATE:
   • The Pathauto pattern is resolved via token replacement.
   • hook_pathauto_alias_alter() is invoked (with domain context).
   • DomainAliasUniquifier::uniquify() ensures the alias is unique on that domain.
   • DomainAliasStorageHelper::save() creates or updates the path alias with the domain_id.
5. Items where pathauto state is SKIP are left to DomainPathItem::postSave() for manual alias handling.

Cleanup on deletion

• Entity deletion — all domain-specific aliases and pathauto state entries are removed.
• Domain deletion — all pathauto state entries for that domain (across all entity types) are purged from the key-value store.

Extending

Altering the generated alias

Use hook_pathauto_alias_alter() as usual. The $context array includes a domain_id key when the alias is generated by this submodule:

function mymodule_pathauto_alias_alter(&$alias, array &$context) {
  if (!empty($context['domain_id'])) {
    // Alter alias for a specific domain.
  }
}

Altering the pattern

Use hook_pathauto_pattern_alter() to modify the pattern before token replacement. The $context array also includes domain_id.