CODEWITHSUNDEEP
ruby-on-railsactiverecord
Erik Trautman
Erik Trautman

Reputation: 6029

Returning siblings (child.parent.children) in Active Record

Is there a better way to return the "siblings" of the children in a one-to-many relationship in Rails? Assume standard associations have been set up.

For instance, now I would do something like:

child.parent.children

Or, to exclude the current record,

child.parent.children - [child]

This feels a bit dirty (Demeter violation?)... is there a more acceptable best practice?

Upvotes: 3

Views: 1470

Answers (1)

Ruby Racer
Ruby Racer

Reputation: 5740

As far as I know, there is no out-of-the-box way to do this.

Not going to be radical about it, but this is more acceptable, in the sense that it won't transform your output:

child.parent.children.where.not(id:child.id)

One other way to make it available to your objects, in Model (child.rb) definition:

def siblings
    parent.children.where.not(id:self.id)
end

and then you will have:

child.siblings

exactly as above

Upvotes: 7

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