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When I install a new module containing hook_node_access_records() and hook_node_grants(), Does it change permissions for existing nodes? Or it affects only on new nodes?

If it doesn't change permissions for existing nodes, Is there a way to rebuild node_access table?

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You can implement hook_enable() and call node_access_needs_rebuild(TRUE), see user_relationship_node_access_enable() for an example.

That doesn't actually do much on its own, but Drupal will then automatically print a message to administrators and inform them that the permissions need to be rebuild and also includes a link to the place where this can be done.

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I don't know if it affect the old node, but I think no. If you need to rebuild the access, can go in Content management -> Post settings and you'll see a form to allow you rebuild permissions.

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