Introduce Parameters type (using RootModel), equivalent to edr-pydant…

…ic Parameters

src/covjson_pydantic/coverage.py

@@ -21,7 +21,7 @@
 from .ndarray import NdArrayInt
 from .ndarray import NdArrayStr
 from .ndarray import TiledNdArrayFloat
-from .parameter import Parameter
+from .parameter import Parameters
 from .parameter import ParameterGroup
 from .reference_system import ReferenceSystemConnectionObject
 
@@ -32,7 +32,7 @@ class Coverage(CovJsonBaseModel, extra="allow"):
     id: Optional[str] = None
     type: Literal["Coverage"] = "Coverage"
     domain: Domain
-    parameters: Optional[Dict[str, Parameter]] = None
+    parameters: Optional[Parameters] = None
     parameterGroups: Optional[List[ParameterGroup]] = None  # noqa: N815
     ranges: Dict[str, Union[NdArrayTypes, TiledNdArrayFloat, AnyUrl]]
 
@@ -41,6 +41,6 @@ class CoverageCollection(CovJsonBaseModel, extra="allow"):
     type: Literal["CoverageCollection"] = "CoverageCollection"
     domainType: Optional[DomainType] = None  # noqa: N815
     coverages: List[Coverage]
-    parameters: Optional[Dict[str, Parameter]] = None
+    parameters: Optional[Parameters] = None
     parameterGroups: Optional[List[ParameterGroup]] = None  # noqa: N815
     referencing: Optional[List[ReferenceSystemConnectionObject]] = None

src/covjson_pydantic/parameter.py

@@ -5,6 +5,7 @@
 from typing import Union
 
 from pydantic import model_validator
+from pydantic import RootModel
 
 from .base_models import CovJsonBaseModel
 from .i18n import i18n
@@ -32,6 +33,9 @@ def must_not_have_unit_if_observed_property_has_categories(self):
         return self
 
 
+Parameters = RootModel[Dict[str, Parameter]]
+
+
 class ParameterGroup(CovJsonBaseModel, extra="allow"):
     type: Literal["ParameterGroup"] = "ParameterGroup"
     id: Optional[str] = None