Hi,
Let's take a look at the following example:
Visitor.preload(
{allowed_meals: [:meal]}
{meal_availabilities: [:meal]}
)
What happens is that Rails (I'm using version 4.1) is issuing several
queries to meals:
Meals Load ... SELECT * from meals where id in (1, 2, 3, 4, 5) # using
list of ids relevant for "allowed_meals"
Meals Load ... SELECT * from meals where id in (3, 4, 5, 6) # using
list of ids relevant for "meal_availabilities"
For performance reasons - it would be nice to issue just a single query
instead of above two, e.g.:
Meals Load ... SELECT * from meals where id in (1, 2, 3, 4, 5, 6)
Is that possible?
Regards,
Yavor
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