To use nested set you need complementary routes.
In routing.yml replace admingenerator
by admingenerator_nested
Admingenerator_demonested:
resource: "@AdmingeneratorDemoBundle/Controller/Category/"
type: admingenerator_nested
prefix: /category
In generator.yml replace list
by nested_list
builders:
nested_list:
params:
title: Liste des categories
display: ~
actions:
new: ~
object_actions:
edit: ~
delete: ~
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