FIX: Give Optionals a default value

src/fmu/dataio/_model/data.py

@@ -27,7 +27,6 @@ class Timestamp(BaseModel):
     being marked and a string label for this timestamp."""
 
     label: Optional[str] = Field(
-        default=None,
         examples=["base", "monitor", "mylabel"],
     )
     """A string label corresponding to the timestamp."""
@@ -46,10 +45,10 @@ class Time(BaseModel):
 
     .. note:: ``data.time`` items can currently hold a maximum of two values."""
 
-    t0: Optional[Timestamp] = None
+    t0: Optional[Timestamp] = Field(default=None)
     """The first timestamp. See :class:`Timestamp`."""
 
-    t1: Optional[Timestamp] = None
+    t1: Optional[Timestamp] = Field(default=None)
     """The second timestamp. See :class:`Timestamp`."""
 
 
@@ -65,16 +64,16 @@ class Seismic(BaseModel):
     calculation: Optional[str] = Field(default=None, examples=["mean"])
     """The type of calculation applied."""
 
-    filter_size: Optional[float] = Field(allow_inf_nan=False, default=None)
+    filter_size: Optional[float] = Field(default=None, allow_inf_nan=False)
     """The filter size applied."""
 
-    scaling_factor: Optional[float] = Field(allow_inf_nan=False, default=None)
+    scaling_factor: Optional[float] = Field(default=None, allow_inf_nan=False)
     """The scaling factor applied."""
 
     stacking_offset: Optional[str] = Field(default=None, examples=["0-15"])
     """The stacking offset applied."""
 
-    zrange: Optional[float] = Field(allow_inf_nan=False, default=None)
+    zrange: Optional[float] = Field(default=None, allow_inf_nan=False)
     """The z-range of these data."""
 
 
@@ -305,13 +304,13 @@ class Data(BaseModel):
     """Column names in the table which can be used for indexing. Only applicable if the
     data object is a table."""
 
-    base: Optional[Layer] = None
+    base: Optional[Layer] = Field(default=None)
     """If the data represent an interval, this field can be used to represent its base.
     See :class:`Layer`.
 
     .. note:: ``top`` is required to use with this."""
 
-    top: Optional[Layer] = None
+    top: Optional[Layer] = Field(default=None)
     """If the data represent an interval, this field can be used to represent its top.
     See :class:`Layer`.
 

src/fmu/dataio/_model/fields.py

@@ -103,7 +103,9 @@ class File(BaseModel):
     )
     """The path of a file relative to the case root."""
 
-    checksum_md5: Optional[str] = Field(examples=["kjhsdfvsdlfk23knerknvk23"])
+    checksum_md5: Optional[str] = Field(
+        default=None, examples=["kjhsdfvsdlfk23knerknvk23"]
+    )
     """A valid MD5 checksum of the file."""
 
     size_bytes: Optional[int] = Field(default=None)

src/fmu/dataio/_model/specification.py

@@ -52,7 +52,7 @@ class SurfaceSpecification(RowColumn):
 class PointSpecification(BaseModel):
     """Specifies relevant values describing an xyz points object."""
 
-    attributes: Optional[List[str]]
+    attributes: Optional[List[str]] = Field(default_factory=list)
     """List of columns present in a table."""
 
     size: int = Field(examples=[1, 9999])