Make every field of a struct optional

For PATCH-shaped input, where only the supplied keys mean anything. Defaults are dropped as well as requirements, so "not supplied" stays distinguishable from "set to the default".

Usage

partial(.parent, .name = paste0("Partial", .spec(as_type(.parent))$name))

Arguments

.parent

The struct to weaken, or an S7 class.

.name

The new struct's name.

Value

A constructor of class typed_struct.

See also

struct(), extend()

Examples

Post <- struct("Post", title = chr[1], body = chr[1], draft = lgl[1] %default% TRUE)
PostPatch <- partial(Post)
PostPatch
#> <struct> PartialPost
#>   title : chr[1] | NULL
#>   body  : chr[1] | NULL
#>   draft : lgl[1] | NULL

patch <- PostPatch(title = "New title")
patch$title
#> [1] "New title"
patch$draft          # NULL, not the default
#> NULL