Namespaces

Namespaces prefix field names in error output.

In()

Use In("address", ...) for nested structs.

val := v.
  Is(v.String(p.Name, "name").OfLengthBetween(4, 20)).
  In("address", v.Is(
    v.String(p.Address.Name, "name").Not().Blank(),
    v.String(p.Address.Street, "street").Not().Blank(),
  ))

Errors use dot notation (e.g. address.name).

InRow()

Use InRow("addresses", i, ...) for a slice of structs:

val := v.Is(v.String(p.Name, "name").OfLengthBetween(4, 20))
for i, a := range p.Addresses {
  val.InRow("addresses", i, v.Is(
    v.String(a.Name, "name").Not().Blank(),
    v.String(a.Street, "street").Not().Blank(),
  ))
}

Errors include indexes: addresses[0].name.

InCell()

Use InCell("tags", i, ...) for a slice of scalar values:

val := v.New()
for i, tag := range tags {
  val.InCell("tags", i, v.Is(
    v.String(tag, "name").Not().Blank(),
  ))
}

Errors target the indexed cell: tags[0].