invoke

modelIdcollection.modelId(attrs) Override this method to return the value the collection will use to identify a model given its attributes

findWherecollection.findWhere(attributes) Just like where

map (collect)

shiftcollection.shift([options]) Remove and return the first model from a collection. Takes the same options as

find (detect)

rest (tail, drop)

unshiftcollection.unshift(model, [options]) Add a model at the beginning of a collection. Takes the same options as

pluckcollection.pluck(attribute) Pluck an attribute from each model in the collection. Equivalent to calling map and

reject