On Nov 9, 2:42 pm, Journeyer <[email protected]> wrote:
> What is custom :eager_loader BTW ?
Eager loading is when you have multiple attendances and you want to
get the child for all of them in a single query. Let's say you are
doing:
Attendance.all do |a|
a.child
end
That will do 1 query to get the attendances, and 1 query for each
attendance to get the related child.
Eager loading allows you to do:
Attendance.eager(:child).all do |a|
a.child
end
That will do 1 query to get the attendances, and 1 query to get the
child for each attendance. So if you have 1000 attendances, it saves
you 999 queries.
:eager_loader is the option you use to specify a custom eager loading
routine. Since you are hard coding the acad_year in the association
block, you may not even need one.
Jeremy
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