Schema for associations like has_one and has_many

[morrisson]

With 'parent' and 'relation' statement, we can define a kind of 'belongs_to' association. We often get 'child' resources for visualizing when querying some resources but currently there is no way to get child resources.

To enhance usability of querying data, schema description should allow to define associations like has_one and has_many. Example schema is as follows:

schemas:
- id: some_resource
  description: Some Resource Schema
  title: Some Resource
  singular: some_resource
  plural: some_resources
  associations:
    has_one:
    - some_operational_resource
    has_many:
    - some_child_resource
    - some_other_child_resource
  schema:
    properties:
      ...

'Child' resources should have foreign_key for parent resource which is created automatically.

[nati]

+1