NAS-138384 / 26.04 / Properly handle oneOf schema case

[Qubad786]

Problem

We had midcli failing with the following pydantic model

class PoolDatasetCreateArgs(BaseModel):
    data: PoolDatasetCreateFilesystem | PoolDatasetCreateVolume = Field(discriminator='type')
    """Configuration data for creating a new ZFS dataset."""

Reason was that the schema generated for this uses oneOf and we ran into key error because of this as this was not handled.
Example schema:

{
  "discriminator": {
    "mapping": {
      "FILESYSTEM": "#/$defs/FilesystemType",
      "VOLUME": "#/$defs/VolumeType"
    },
    "propertyName": "type"
  },
  "oneOf": [
    {
      "properties": {
        "type": {
          "const": "FILESYSTEM",
          "default": "FILESYSTEM",
          "title": "type",
          "type": "string",
          "_name_": "type",
          "_required_": false
        },
        "name": {
          "title": "name",
          "type": "string",
          "_name_": "name",
          "_required_": true
        },
        "recordsize": {
          "default": "128K",
          "title": "recordsize",
          "type": "string",
          "_name_": "recordsize",
          "_required_": false
        }
      },
      "required": [
        "name"
      ],
      "title": "FilesystemType",
      "type": "object",
      "_attrs_order_": [
        "type",
        "name",
        "recordsize"
      ]
    },
    {
      "properties": {
        "type": {
          "const": "VOLUME",
          "default": "VOLUME",
          "title": "type",
          "type": "string",
          "_name_": "type",
          "_required_": false
        },
        "name": {
          "title": "name",
          "type": "string",
          "_name_": "name",
          "_required_": true
        },
        "volsize": {
          "title": "volsize",
          "type": "integer",
          "_name_": "volsize",
          "_required_": true
        }
      },
      "required": [
        "name",
        "volsize"
      ],
      "title": "VolumeType",
      "type": "object",
      "_attrs_order_": [
        "type",
        "name",
        "volsize"
      ]
    }
  ],
  "title": "data",
  "_name_": "data",
  "_required_": true
}

Solution

Properly handle oneOf in midcli so that it gets parsed in the correct way similar to how anyOf works.

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-138384

[bugclerk]

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