Std.Db.Repository.one
1 declaration
fn
one: &Std.Db.Driver.Rows -> fn(Std.Db.Driver.Rows, Int) -> Result[T, Std.Db.Repository.RowError] -> Result[T, Std.Db.Repository.RowError]This is a callable function.
What it does
Exactly one row as a value.
A lookup that found none and one that found several are different, and both
are refused. Answering the first of several is how a program acts on the
wrong record without anything appearing to go wrong.
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.