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I've created a custom entity and having trouble providing proper caching.

When you create custom entity, by default it has only one cache tag entity_type:id.

Problem is, I need to display same entity to different users (by role) in a different way.

So I think I need cache tags, such as entity_type:id:user_role? How do I go with this?

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    You want to set cache context by role: drupal.org/docs/8/api/cache-api/cache-contexts – Jaypan Aug 13 at 5:56
  • Yes, this is a context. The permission based context is set by default, so you rarely need to set an extra role context, unless you have users with different roles resulting in the same permissions. – 4k4 Aug 13 at 6:25
  • Can you explain that a little more 4k4? Are you saying that the cache context is automatically set by permissions by default, and therefore does not require explicit cache contexts to be set? – Jaypan Aug 14 at 0:30
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To add a cache dependency on user roles you don't need a cache tag, but a cache context user.roles.

However, you rarely need this context, because there is already a default render context for the hashed user permissions user.permissions, set in the container variable required_cache_contexts, which is applied on all render arrays:

default.services.yml:

parameters:
  renderer.config:
    # Renderer required cache contexts:
    #
    # The Renderer will automatically associate these cache contexts with every
    # render array, hence varying every render array by these cache contexts.
    #
    # @default ['languages:language_interface', 'theme', 'user.permissions']
    required_cache_contexts: ['languages:language_interface', 'theme', 'user.permissions']

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