from lib import permissions


class PermissionsAdminMixin:
    def has_add_permission(self, request, obj=None):
        """If a group right is not set :)
        Allways be able to create a version
        """
        return permissions(obj) if obj else True

    def has_change_permission(self, request, obj=None):
        """Versions are immutable """
        return permissions(obj) if obj else True

    def has_delete_permission(self, request, obj=None):
        """Versions are immutable """
        return permissions(obj) if obj else True

    def has_view_permissions(selfself, request, obj=None):
        return True