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I have a model Profile that has a onetoone with the model Interest. If I query an array of Profiles using where, how would I then get another separate array composed of the Interests associated with those originally queried Profiles?

Something like

@foundProfiles = Profile.where(field: data)

into

@foundInterests = @foundProfiles.Interest.all

this doesn't work, but that's the idea I'm trying to get at.

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1 Answer 1

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Make use of association:

@foundProfiles = Profile.includes(:interest).where(field: data)
# Eager load interest to avoid n + 1 queries

@foundInterests = @foundProfiles.map(&:interest)

EDIT

If you need to query further on the Interest records you can do something like:

@foundInterests = Interest.where(profile_id: @foundProfiles.map(&:id))

This will return you Interest records associated with @foundProfiles and you can chain where on it

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6 Comments

Thanks, I was in the dark about the map function.
It seems as though I can't do a follow up where on @foundInterests though... it gives me a no method where error
No you can't. it will return you array
Okay then. If I did a query of Interests, how would I then do another query (using some criteria) on the Profiles associated with those Interests? So that my final result is an array of desired Profiles? This is a slight reversal of the original question in terms of objects, but the key question is a the same. How would I do a query, and then do another query of the associated objects?
You can use ids
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