[Variant] Support Nested Data in VariantBuilder #7696
Description
Is your feature request related to a problem or challenge? Please describe what you are trying to do.
As discussed by @scovich @PinkCrow007 and I on #7653 (comment) we need to figure out how to build nested objects
Describe the solution you'd like
I would like some way to create an nested structures such as lists of structs
For example
[
{
"first_name": "Jiaying",
"last_name": "Li"
},
{
"first_name": "Malthe",
"last_name": "Karbo"
}
]Describe alternatives you've considered
One way would be to add new_list and new_struct methods to the existing ListBuilder and StructBuilder, something like
let mut builder = VariantBuilder::new();
// create overall list
let mut list = builder.new_list();
// create first object
mut let obj = list.new_object(); // NOTE this is on the `list` builder not the overall builder
obj.set("first_name", "Jiaying");
obj.set("last_name", "Li");
obj.finish(); // finish the first object
// create second object
mut let obj = list.new_object(); // NOTE this is on the `list` builder not the overall builder
obj.set("first_name", "Malthe");
obj.set("last_name", "Karbo");
obj.finish(); // finish the first object
// finish the overall list
list.finish()
let (metadata, value) = builder.fiinish();Additional context