🐛 FIX: REST API date-time query (#4959)

This was excepting because the `DatetimePrecision` class did not have an assigned hashing function.
Here we move this class to `aiida.common`, to avoid cyclic import,
and add the hash function. 

Co-authored-by: Chris Sewell <chrisj_sewell@hotmail.com>

aiida/common/hashing.py

@@ -19,9 +19,9 @@
 from functools import singledispatch
 from itertools import chain
 from operator import itemgetter
-
 import pytz
 
+from aiida.common.utils import DatetimePrecision
 from aiida.common.constants import AIIDA_FLOAT_PRECISION
 from aiida.common.exceptions import HashingError
 
@@ -279,6 +279,15 @@ def _(val, **kwargs):
     return [_single_digest('uuid', val.bytes)]
 
 
+@_make_hash.register(DatetimePrecision)
+def _(datetime_precision, **kwargs):
+    """ Hashes for DatetimePrecision object
+    """
+    return [_single_digest('dt_prec')] + list(
+        chain.from_iterable(_make_hash(i, **kwargs) for i in [datetime_precision.dtobj, datetime_precision.precision])
+    ) + [_END_DIGEST]
+
+
 @_make_hash.register(Folder)
 def _(folder, **kwargs):
     """

aiida/common/utils.py

@@ -15,7 +15,7 @@
 import re
 import sys
 from uuid import UUID
-
+from datetime import datetime
 from .lang import classproperty
 
 
@@ -595,3 +595,27 @@ def result(self, raise_error=Exception):
     def raise_errors(self, raise_cls):
         if not self.success():
             raise raise_cls(f'The following errors were encountered: {self.errors}')
+
+
+class DatetimePrecision:
+    """
+    A simple class which stores a datetime object with its precision. No
+    internal check is done (cause itis not possible).
+
+    precision:  1 (only full date)
+                2 (date plus hour)
+                3 (date + hour + minute)
+                4 (dare + hour + minute +second)
+    """
+
+    def __init__(self, dtobj, precision):
+        """ Constructor to check valid datetime object and precision """
+
+        if not isinstance(dtobj, datetime):
+            raise TypeError('dtobj argument has to be a datetime object')
+
+        if not isinstance(precision, int):
+            raise TypeError('precision argument has to be an integer')
+
+        self.dtobj = dtobj
+        self.precision = precision

aiida/restapi/common/utils.py

@@ -15,6 +15,7 @@
 from flask.json import JSONEncoder
 from wrapt import decorator
 
+from aiida.common.utils import DatetimePrecision
 from aiida.common.exceptions import InputValidationError, ValidationError
 from aiida.manage.manager import get_manager
 from aiida.restapi.common.exceptions import RestValidationError, \
@@ -62,30 +63,6 @@ def default(self, o):
         return JSONEncoder.default(self, o)
 
 
-class DatetimePrecision:
-    """
-    A simple class which stores a datetime object with its precision. No
-    internal check is done (cause itis not possible).
-
-    precision:  1 (only full date)
-                2 (date plus hour)
-                3 (date + hour + minute)
-                4 (dare + hour + minute +second)
-    """
-
-    def __init__(self, dtobj, precision):
-        """ Constructor to check valid datetime object and precision """
-
-        if not isinstance(dtobj, datetime):
-            raise TypeError('dtobj argument has to be a datetime object')
-
-        if not isinstance(precision, int):
-            raise TypeError('precision argument has to be an integer')
-
-        self.dtobj = dtobj
-        self.precision = precision
-
-
 class Utils:
     """
     A class that gathers all the utility functions for parsing URI,

tests/common/test_hashing.py

@@ -25,6 +25,7 @@
 except ImportError:
     import unittest
 
+from aiida.common.utils import DatetimePrecision
 from aiida.common.exceptions import HashingError
 from aiida.common.hashing import make_hash, float_to_text, chunked_file_hash
 from aiida.common.folders import SandboxFolder
@@ -169,6 +170,12 @@ def test_datetime(self):
             'be7c7c7faaff07d796db4cbef4d3d07ed29fdfd4a38c9aded00a4c2da2b89b9c'
         )
 
+    def test_datetime_precision_hashing(self):
+        dt_prec = DatetimePrecision(datetime(2018, 8, 18, 8, 18), 10)
+        self.assertEqual(make_hash(dt_prec), '837ab70b3b7bd04c1718834a0394a2230d81242c442e4aa088abeab15622df37')
+        dt_prec_utc = DatetimePrecision(datetime.utcfromtimestamp(0), 0)
+        self.assertEqual(make_hash(dt_prec_utc), '8c756ee99eaf9655bb00166839b9d40aa44eac97684b28f6e3c07d4331ae644e')
+
     def test_numpy_types(self):
         self.assertEqual(
             make_hash(np.float64(3.141)), 'b3302aad550413e14fe44d5ead10b3aeda9884055fca77f9368c48517916d4be'

tests/restapi/test_routes.py

@@ -10,6 +10,7 @@
 # pylint: disable=too-many-lines
 """Unittests for REST API."""
 import io
+from datetime import date
 
 from flask_cors.core import ACL_ORIGIN
 
@@ -979,6 +980,33 @@ def test_nodes_full_type_filter(self):
             for node in response['data']['nodes']:
                 self.assertIn(node['uuid'], expected_node_uuids)
 
+    def test_nodes_time_filters(self):
+        """
+        Get the list of node filtered by time
+        """
+        today = date.today().strftime('%Y-%m-%d')
+
+        expected_node_uuids = []
+        data = self.get_dummy_data()
+        for calc in data['calculations']:
+            expected_node_uuids.append(calc['uuid'])
+
+        # ctime filter test
+        url = f"{self.get_url_prefix()}/nodes/?ctime={today}&full_type=\"process.calculation.calcjob.CalcJobNode.|\""
+        with self.app.test_client() as client:
+            rv_obj = client.get(url)
+            response = json.loads(rv_obj.data)
+            for node in response['data']['nodes']:
+                self.assertIn(node['uuid'], expected_node_uuids)
+
+        # mtime filter test
+        url = f"{self.get_url_prefix()}/nodes/?mtime={today}&full_type=\"process.calculation.calcjob.CalcJobNode.|\""
+        with self.app.test_client() as client:
+            rv_obj = client.get(url)
+            response = json.loads(rv_obj.data)
+            for node in response['data']['nodes']:
+                self.assertIn(node['uuid'], expected_node_uuids)
+
     ############### Structure visualization and download #############
     def test_structure_derived_properties(self):
         """