Annotate a field so it is both `required` and `default`

[Shelim]

I was unable to find a way to annotate a field, so it both:

• Does have a default value
• Is still required

Reasoning: I am using Vscode as JSON editor, and its intelisense can automatically put the default value of the JSON field from schema when it is created. But the field must be present in data, for the actual loader.

Visual reference (field "Name" has a default value of "Someone") - and I want it to be still required:

[GREsau]

The easiest way to achieve this in schemars 1.0.0-alpha.3 is by using the extend attribute, which can be used to set/override any property on the schema including default:

#[derive(JsonSchema)]
pub struct Author {
    #[schemars(extend("default" = "Someone"))]
    pub name: String,
}

produces:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Author",
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "default": "Someone"
    }
  },
  "required": [
    "name"
  ]
}