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Rails: How to get an object from a has_many relationship that may have children
I have two models, a parent and a child. The relationship is as follows:
# Child
belongs_to :parent
# Parent
has_many :children
I can use a has_many relationship with children and get their info like so:
def get_children
@children = @parent.children
end
My problem is that I don’t always know if there are children. For example, sometimes I want to call get_children and get all parents, and sometimes I want to call get_children and get all parents that have children. I want to be able to check to see if there are children using a method like:
def has_children?
if has_children?
@children
else
[]
end
end
Is there any way to do this? I am stumped and google results only give me ways to do the same process for active record. Thanks in advance for your help!
A:
You could write a private accessor in the parent model, ie. in your example
class Parent
def has_children?
!children.empty?
end
end
Then you can call @parent.has_children? or @parent.children.empty?.
Note that for this method to be a good one, the array needs to be lazy loaded. If you are on a recent rails version and the has_children? method is added directly to the has_many, it will call #load right away. So you might want to use the above method.
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