Std.Db.Store.groupedBy

fn

This is a callable function.

What it does

What belongs to several parents, as a map from each parent's key to what

belongs to it.

This is the shape that matters. Loading what belongs to one parent is

loading for a list of one, so the batched form is the ordinary form and the

form that issues a query per parent is the one somebody has to write a loop

to produce. Offering both as peers is how the slow one becomes the default.

Read the signature

• The text after the name is the type checked by Pudu.
• Read arrows from left to right: inputs come first, and the final type is returned.
• & borrows a value for this call instead of moving or copying it.
• Names inside [ ] are type arguments, such as the item type held by a collection.
• Result makes success and recoverable failure part of the function's type.