Pluck in a selected object

Question

User.find([1,2,3])

I want to get name only in User model. I don't want to loop in an object so I tried:

User.find([1,2,3]).pluck(:name)

But no luck. How can I do the following scenario using pluck behavior?

Answer 1

pluck works on ActiveRecord::Relation. find returns you objects.

I assume, you want to use pluck for the reason that it would make a single SQL query and get names alone rather than fetching all of them records and looping over them like map does to get the name

In that case, you would want to use where like

User.where(id: [1,2,3]).pluck(:name)

where chained with pluck would be the optimal way for your use case.

Documentation: find, where and pluck