I want to override a get method to try to get a value from an associated
object first, and then get the object’s own value if the associated
object returned nil. But, this requires me to avoid calling a get
method from inside the same get method.
To be specific: there are two classes, School and RegisteredInfo.
Normally, the RegisteredInfo class holds the official data for a school
- address, postcode, phone number etc, and in most cases a school
has_one registered info. So, if i want to get the address for a school,
i normally pull it out of the associated RegisteredInfo object:
address = @school.registered_info.address
However, a school might not always have a registered info, and so has
its own address field for this purpose. So, i want to make the address
method as follows:
#in school.rb
def address
if self.registered_info
return self.registered_info.address
else
return self.address
end
end
However, this sets up a circular loop, where the method will keep
calling itself. I’m sure that i’ve used a private/protected method
called something like “read_attribute” that pulled the value out of the
database without calling the get method again. However, i can’t find it
in the api (i’m using rails 2.0.2).
Can anyone help, or provide a nicer alternative to this problem?