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No, it is not impossible to delete objects provided by ActiveRecordAssociationsCollectionProxy.
You can delete the objects by calling the destroy method on the ActiveRecord_Associations_CollectionProxy object or by calling the destroy_all method on the associated objects.
For example:
# assuming you have a has_many association between User and Post
user = User.first
posts = user.posts # posts is an ActiveRecord_Associations_CollectionProxy object
# deleting a specific object
post = posts.first
post.destroy
# deleting all objects
posts.destroy_all
It's important to note that deleting objects using these methods will also delete any associated objects that depend on them.