method

pick

v7.1.3.2 - Show latest stable - 0 notes - Class: ActiveRecord::Calculations

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What's this?

pick(*column_names) public

Pick the value(s) from the named column(s) in the current relation. This is short-hand for relation.limit(1).pluck(*column_names).first, and is primarily useful when you have a relation that’s already narrowed down to a single row.

Just like #pluck, #pick will only load the actual value, not the entire record object, so it’s also more efficient. The value is, again like with pluck, typecast by the column type.

Person.where(id: 1).pick(:name)
# SELECT people.name FROM people WHERE id = 1 LIMIT 1
# => 'David'

Person.where(id: 1).pick(:name, :email_address)
# SELECT people.name, people.email_address FROM people WHERE id = 1 LIMIT 1
# => [ 'David', 'david@loudthinking.com' ]

Show source

# File activerecord/lib/active_record/relation/calculations.rb, line 342
    def pick(*column_names)
      if loaded? && all_attributes?(column_names)
        result = records.pick(*column_names)
        return @async ? Promise::Complete.new(result) : result
      end

      limit(1).pluck(*column_names).then(&:first)
    end

pick

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