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Bulk insert & delete

You can insert multiple models at the same time (using just one INSERT query) using the Collection#import method:
u ={id: 1, first_name: "x"})
u2 ={id: 2, first_name: "y"})
u3 ={id: 3, first_name: "z"})
o = User.import([u, u2, u3])
Only non-persisted valid models can be inserted. Any validation failure in the model list will throw an exception and revert the whole process.
Collection#import allows the passing optional block to refine he insert query built:
User.import([u, u2, u3]) do |request|
request.on_conflict("(id)").do_update { |upd|
upd.set("id = NULL")
.where { == }