/RethinkDB Ruby

ReQL command: pluck

Command syntax

sequence.pluck([selector1, selector2...]) → stream
array.pluck([selector1, selector2...]) → array
object.pluck([selector1, selector2...]) → object
singleSelection.pluck([selector1, selector2...]) → object


Plucks out one or more attributes from either an object or a sequence of objects (projection).

Example: We just need information about IronMan’s reactor and not the rest of the document.

r.table('marvel').get('IronMan').pluck('reactorState', 'reactorPower').run(conn)

Example: For the hero beauty contest we only care about certain qualities.

r.table('marvel').pluck('beauty', 'muscleTone', 'charm').run(conn)

Example: Pluck can also be used on nested objects.

r.table('marvel').pluck({:abilities => {:damage => true, :mana_cost => true}, :weapons => true}).run(conn)

Example: The nested syntax can quickly become overly verbose so there’s a shorthand for it.

r.table('marvel').pluck({:abilities => [:damage, :mana_cost]}, :weapons).run(conn)

For more information read the nested field documentation.

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