MAINT: Define schema inside FmuResults model

schemas/0.8.0/fmu_results.json

@@ -458,6 +458,12 @@
     "CaseMetadata": {
       "description": "The FMU metadata model for an FMU case.\n\nA case represent a set of iterations that belong together, either by being part of\nthe same run (i.e. history matching) or by being placed together by the user,\ncorresponding to /scratch/<asset>/<user>/<my case name>/.",
       "properties": {
+        "$schema": {
+          "format": "uri",
+          "minLength": 1,
+          "title": "$Schema",
+          "type": "string"
+        },
         "access": {
           "$ref": "#/$defs/Access"
         },
@@ -3529,6 +3535,12 @@
     "IterationMetadata": {
       "description": "The FMU metadata model for an FMU Iteration.\n\nAn object representing a single Iteration of a specific case.",
       "properties": {
+        "$schema": {
+          "format": "uri",
+          "minLength": 1,
+          "title": "$Schema",
+          "type": "string"
+        },
         "access": {
           "$ref": "#/$defs/Access"
         },
@@ -4614,6 +4626,12 @@
     "ObjectMetadata": {
       "description": "The FMU metadata model for a given data object.",
       "properties": {
+        "$schema": {
+          "format": "uri",
+          "minLength": 1,
+          "title": "$Schema",
+          "type": "string"
+        },
         "access": {
           "$ref": "#/$defs/SsdlAccess"
         },
@@ -6454,6 +6472,12 @@
     "RealizationMetadata": {
       "description": "The FMU metadata model for an FMU Realization.\n\nAn object representing a single Realization of a specific Iteration.",
       "properties": {
+        "$schema": {
+          "format": "uri",
+          "minLength": 1,
+          "title": "$Schema",
+          "type": "string"
+        },
         "access": {
           "$ref": "#/$defs/Access"
         },

src/fmu/dataio/_metadata.py

@@ -12,18 +12,13 @@
 
 from typing import TYPE_CHECKING, Final, List, Literal, Optional, Union
 
-from pydantic import (
-    AnyHttpUrl,
-    BaseModel,
-    Field,
-)
+from pydantic import Field
 
 from ._logging import null_logger
 from ._models.fmu_results import data, fields
 from ._models.fmu_results.enums import FMUClass
 from ._models.fmu_results.fmu_results import (
     CaseMetadata,
-    FmuResultsSchema,
     ObjectMetadata,
 )
 from ._models.fmu_results.global_configuration import GlobalConfiguration
@@ -42,17 +37,7 @@
 logger: Final = null_logger(__name__)
 
 
-class JsonSchemaMetadata(BaseModel):
-    """Mixin to inject the $schema field into exported metadata."""
-
-    schema_: AnyHttpUrl = Field(
-        default_factory=lambda: AnyHttpUrl(FmuResultsSchema.url()),
-        alias="$schema",
-        frozen=True,
-    )
-
-
-class ObjectMetadataExport(JsonSchemaMetadata, ObjectMetadata, populate_by_name=True):
+class ObjectMetadataExport(ObjectMetadata, populate_by_name=True):
     """Wraps the schema ObjectMetadata, adjusting some values to optional for pragmatic
     purposes when exporting metadata."""
 
@@ -65,7 +50,7 @@ class ObjectMetadataExport(JsonSchemaMetadata, ObjectMetadata, populate_by_name=
     preprocessed: Optional[bool] = Field(alias="_preprocessed", default=None)
 
 
-class CaseMetadataExport(JsonSchemaMetadata, CaseMetadata, populate_by_name=True):
+class CaseMetadataExport(CaseMetadata, populate_by_name=True):
     """Adds the optional description field for backward compatibility."""
 
     class_: Literal[FMUClass.case] = Field(

src/fmu/dataio/_models/fmu_results/fmu_results.py

@@ -4,6 +4,7 @@
 from typing import TYPE_CHECKING, Literal, Union
 
 from pydantic import (
+    AnyHttpUrl,
     BaseModel,
     Field,
     GetJsonSchemaHandler,
@@ -131,6 +132,12 @@ class MetadataBase(BaseModel):
     version: str = Field(default=FmuResultsSchema.VERSION)
     """The version of the schema that generated this data."""
 
+    schema_: AnyHttpUrl = Field(
+        default_factory=lambda: AnyHttpUrl(FmuResultsSchema.url()),
+        alias="$schema",
+    )
+    """The url of the schema that generated this data."""
+
 
 class CaseMetadata(MetadataBase):
     """The FMU metadata model for an FMU case.

tests/test_units/test_metadata_class.py

@@ -12,7 +12,7 @@
     OperatingSystem,
     TracklogEvent,
 )
-from fmu.dataio._utils import prettyprint_dict
+from fmu.dataio._utils import prettyprint_dict, read_metadata_from_file
 from fmu.dataio.providers.objectdata._provider import objectdata_provider_factory
 
 # pylint: disable=no-member
@@ -33,6 +33,14 @@ def test_metadata_dollars(edataobj1, regsurf):
     assert mymeta["$schema"] == FmuResultsSchema.url()
     assert mymeta["source"] == FmuResultsSchema.SOURCE
 
+    # also check that it is preserved in the exported metadata
+    exportpath = edataobj1.export(regsurf)
+    exportmeta = read_metadata_from_file(exportpath)
+
+    assert exportmeta["version"] == FmuResultsSchema.VERSION
+    assert exportmeta["$schema"] == FmuResultsSchema.url()
+    assert exportmeta["source"] == FmuResultsSchema.SOURCE
+
 
 # --------------------------------------------------------------------------------------
 # Tracklog