Bug with `leaf?` method

[marcinwierzbicki]

leaf? method given me exception:

TypeError: nil can't be coerced into Fixnum
from /usr/local/bundle/gems/activerecord-5.0.0.1/lib/active_record/associations/collection_association.rb:319:in `+'

I have the same error with this:
model.association.children.size.zero?

Can we change implementation of leaf?

acts_as_tree/lib/acts_as_tree.rb

Line 352 in 4fa8980

def leaf?

method from:

def leaf?
  children.size.zero?
end

to:

def leaf?
  children.blank?
end

?

Video: https://youtu.be/hutkAa39JcU

[felixbuenemann]

This is strange, because children should be a has_many association, which cannot return nil.

Maybe you have a method on your model that overrides the default children association?

[marcinwierzbicki]

I have not method that overrides this chilldren association. My first idea was eager loading in ActiveRecord - my video present this behavior.

[felixbuenemann]

This sounds similar to the ActiveRecord bug described in issue rails/rails#28579.

Could you try if the bug is fixed by using rails master?

[marcinwierzbicki]

Bug is fixed in rails#master