Rails 3 ActiveRecord query in an array

Question

I have a model with a one_to_many relationship to another model such that:

user.area_ids = [1, 2, 3]

And then another model that shares the relationship but is a one to one.

listing.area_id = 1

How do I query for all the listings that are either area_id of 1 2 or 3. I am hoping to do something like...

Listing.where("area_id IN ?", user.area_ids) 

But that doesn't work.

Any help would be appreciated!

Answer 1

You're being too clever. Rails understands how to do where(field: [1,2,3]) just fine.

If you give where a regular key: value where the value is an array, it will build the where FIELD in (a,b,c) for you.

Just use

Listing.where(area_id: user.area_ids)  # select ... where area_id in (1,2,3)

Answer 2

You forgot braces around question mark :) try this:

Listing.where("area_id IN (?)", user.area_ids) 

But as for me, more proper way is to make it cleaner with a help of

class User 
  has_many :areas
  has_many :listings, through: :areas
end

and then just call

user.listings