Question

I have these WHERE conditions in a PostgreSQL query that I need to translate to mongoDB:

(starts_at BETWEEN :starts AND :ends) OR (starts_at <= :starts AND ends_at >= :starts)

Note :starts and :ends are UTC times. Specifically, I’m moving this from ActiveRecord to MongoMapper. So bonus if you can help me with that!

Answer 1

In mongodb, you’d use the $or operator like this (along with $gte and $lte):

db.collection.find({
    $or: [
        { starts_at: { $gte: starts }, starts_at: { $lte: ends } },
        { starts_at: { $lte: starts }, ends_at: { $gte: starts } }
    ]
});

In MongoMapper that would translate to:

Model.where(
    :$or => [
        { :starts_at => { :$gte => starts, :$lte => ends } },
        { :starts_at => { :$lte => starts }, :ends_at => { :$gte => starts } }
    ]
)