Save a root in dm-is-tree yield an validation error:
@errors={:parent_id=>["Parent must not be blank"]}
that's because root(s) node parent_id is NULL, but dm-is-tree calls
"belongs_to :parent" doesn't carry :required => false option.
http://github.com/drove/dm-more/blob/master/dm-is-tree/lib/dm-is-tree/is/tree.rb#L74
assc_options = { :model => options[:model], :child_key => Array(options
[:child_key]) }
should be:
assc_options = { :model => options[:model], :child_key => Array(options
[:child_key]) , :required => false}
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