Add date support (dfurtado#45)

Author: millar

dataclass_csv/dataclass_reader.py

@@ -1,7 +1,7 @@
 import dataclasses
 import csv
 
-from datetime import datetime
+from datetime import date, datetime
 from distutils.util import strtobool
 from typing import Union, Type, Optional, Sequence, Dict, Any, List
 
@@ -157,7 +157,7 @@ def _get_value(self, row, field):
             else:
                 return value
 
-    def _parse_date_value(self, field, date_value):
+    def _parse_date_value(self, field, date_value, field_type):
         dateformat = self._get_metadata_option(field, "dateformat")
 
         if not isinstance(date_value, str):
@@ -175,7 +175,13 @@ def _parse_date_value(self, field, date_value):
                     "{'dateformat': <date_format>})`."
                 )
             )
-        return datetime.strptime(date_value, dateformat)
+
+        datetime_obj = datetime.strptime(date_value, dateformat)
+
+        if field_type == date:
+            return datetime_obj.date()
+        else:
+            return datetime_obj
 
     def _process_row(self, row):
         values = dict()
@@ -200,9 +206,9 @@ def _process_row(self, row):
                 if len(type_args) == 1:
                     field_type = type_args[0]
 
-            if field_type is datetime:
+            if field_type is datetime or field_type is date:
                 try:
-                    transformed_value = self._parse_date_value(field, value)
+                    transformed_value = self._parse_date_value(field, value, field_type)
                 except ValueError as ex:
                     raise CsvValueError(ex, line_number=self._reader.line_num) from None
                 else:

tests/mocks.py

@@ -1,7 +1,7 @@
 import dataclasses
 import re
 
-from datetime import datetime
+from datetime import date, datetime
 
 from dataclass_csv import dateformat, accept_whitespaces
 
@@ -52,6 +52,13 @@ class UserWithDateFormatDecorator:
     create_date: datetime
 
 
+@dateformat("%Y-%m-%d")
+@dataclasses.dataclass
+class UserWithDateFormatDecoratorAndDateField:
+    name: str
+    create_date: date
+
+
 @dataclasses.dataclass
 class UserWithDateFormatMetadata:
     name: str

tests/test_dataclass_reader.py

@@ -1,7 +1,7 @@
 import pytest
 import dataclasses
 
-from datetime import datetime
+from datetime import date, datetime
 from dataclass_csv import DataclassReader, CsvValueError
 
 from .mocks import (
@@ -12,6 +12,7 @@
     UserWithInitFalse,
     UserWithInitFalseAndDefaultValue,
     UserWithDefaultDatetimeField,
+    UserWithDateFormatDecoratorAndDateField,
     UserWithSSN,
     SSN,
     UserWithEmail,
@@ -183,6 +184,17 @@ def test_reader_with_datetime_default_value(create_csv):
         assert isinstance(items[0].birthday, datetime)
 
 
+def test_reader_with_date(create_csv):
+    csv_file = create_csv({"name": "User", "create_date": "2019-01-01"})
+
+    with csv_file.open() as f:
+        reader = DataclassReader(f, UserWithDateFormatDecoratorAndDateField)
+        items = list(reader)
+        assert len(items) > 0
+        assert isinstance(items[0].create_date, date)
+        assert items[0].create_date == date(2019, 1, 1)
+
+
 def test_should_parse_user_defined_types(create_csv):
     csv_file = create_csv(
         [