Rails 4 scope to find parents with no children
I found one answer that had some usable having examples for finding
parents with n children, but the same is not usable for finding parents
with no children (presumably since the join excludes them).
scope :with_children,
joins(:children).group("child_join_table.parent_id").having("count(child_join_table.parent_id)
> 0")
Can anyone point me in the right direction?
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