Add custom options from mongoose schema to json schema

[vaggeliskls]

I am trying to validate (with custom ajv keywords) the uniqueness and existence of specific properties of a mongoose model.
It would be a nice feature to enrich the __processOptions function in types.js with options types: exists: true|false and unique: true|false or enable a optional input of a predefined array of custom options.
Example: required('mongoose-schema-jsonschema')(mongoose, ['unique', 'exists'] )
Very nice work. Thank you.

[DScheglov]

Hi, @vaggeliskls

I think about something like that:

const config = required('mongoose-schema-jsonschema/config');

config({
  schemaFieldsMapping: [
    'unique',
    'exists',
    {
      mongoose: 'some-field-from-mongoose',
      jsonSchema: 'some-field-to-jsonSchems',
    }
  ]
});

[DScheglov]

Implemented in the v1.4.0.
See: https://github.com/DScheglov/mongoose-schema-jsonschema#schema-build-configuration