Polymorphic model builder plugin

An OARepo Model Builder plugin to generate invenio sources for polymorphic models.

Installation

pip install oarepo-model-builder-polymorphic

Usage

What is polymorphic model?

A polymorphic model is a dict that can be defined by multiple schemas. Which schema is used depends on a value of a present field (that is shared across all the schemas).

Polymorphic model can be used, for example, to express inheritance:

extension1{}:
  disc: { type: keyword }
  a: { type: keyword }

extension2{}:
  disc: { type: keyword }
  b: { type: keyword }

record:
  properties:
    a:
      type: polymorphic
      discriminator: disc
      schemas:
        "1": { use: "/extension1" }
        "2": { use: "/extension2" }

The following are valid instances:

a:
  disc: "1"
  a: "blah"
---
a:
  disc: "2"
  b: "blah"

Invalid instance:

a:
  disc: "3"
  b: "blah"
---
a:
  disc: "1"
  a: "blah"
  b: "blah"

If the "disc" field contains value "1", first extension schema will be used, if it contains value "2", second schema will be used. Any other value is not valid.