Add Lot.parents

ereuse_devicehub/resources/lot/models.py

@@ -2,9 +2,9 @@ import uuid
 from datetime import datetime
 
 from flask import g
+from sqlalchemy import TEXT
 from sqlalchemy.dialects.postgresql import UUID
-from sqlalchemy.orm import aliased
+from sqlalchemy.sql import expression as exp
-from sqlalchemy.sql import expression
 from sqlalchemy_utils import LtreeType
 from sqlalchemy_utils.types.ltree import LQUERY
 from teal.db import UUIDLtree
@@ -53,22 +53,32 @@ class Lot(Thing):
             Path.add(self.id, child)
             db.session.refresh(self)  # todo is this useful?
 
-    def remove_child(self, child: 'Lot'):
+    def remove_child(self, child):
+        if isinstance(child, Lot):
             Path.delete(self.id, child.id)
+        else:
+            assert isinstance(child, uuid.UUID)
+            Path.delete(self.id, child)
 
     @property
     def children(self):
         """The children lots."""
         # From https://stackoverflow.com/a/41158890
-        # todo test
+        id = UUIDLtree.convert(self.id)
-        cls = self.__class__
-        exp = '*.{}.*{{1}}'.format(UUIDLtree.convert(self.id))
-        child_lots = aliased(Lot)
-
         return self.query \
-            .join(cls.paths) \
+            .join(self.__class__.paths) \
-            .filter(Path.path.lquery(expression.cast(exp, LQUERY))) \
+            .filter(Path.path.lquery(exp.cast('*.{}.*{{1}}'.format(id), LQUERY)))
-            .join(child_lots, Path.lot)
+
+    @property
+    def parents(self):
+        """The parent lots."""
+        id = UUIDLtree.convert(self.id)
+        i = db.func.index(Path.path, id)
+        parent_id = db.func.replace(exp.cast(db.func.subpath(Path.path, i - 1, i), TEXT), '_', '-')
+        join_clause = parent_id == exp.cast(Lot.id, TEXT)
+        return self.query.join(Path, join_clause).filter(
+            Path.path.lquery(exp.cast('*{{1}}.{}.*'.format(id), LQUERY))
+        )
 
     def __contains__(self, child: 'Lot'):
         return Path.has_lot(self.id, child.id)

ereuse_devicehub/resources/lot/models.pyi

@@ -31,7 +31,7 @@ class Lot(Thing):
     def add_child(self, child: Union[Lot, uuid.UUID]):
         pass
 
-    def remove_child(self, child: Lot):
+    def remove_child(self, child: Union[Lot, uuid.UUID]):
         pass
 
     @classmethod
@@ -42,6 +42,10 @@ class Lot(Thing):
     def children(self) -> LotQuery:
         pass
 
+    @property
+    def parents(self) -> LotQuery:
+        pass
+
 
 class Path:
     id = ...  # type: Column

ereuse_devicehub/resources/lot/schemas.py

@@ -12,6 +12,5 @@ class Lot(Thing):
     name = f.String(validate=f.validate.Length(max=STR_SIZE), required=True)
     closed = f.Boolean(missing=False, description=m.Lot.closed.comment)
     devices = NestedOn(Device, many=True, dump_only=True)
-    children = NestedOn('Lot',
+    children = NestedOn('Lot', many=True, dump_only=True)
-                        many=True,
+    parents = NestedOn('Lot', many=True, dump_only=True)
-                        dump_only=True)

ereuse_devicehub/resources/lot/views.py

@@ -49,6 +49,7 @@ class LotBaseChildrenView(View):
         lot = self.get_lot(id)
         self._post(lot, self.get_ids())
         db.session.commit()
+
         ret = self.schema.jsonify(lot)
         ret.status_code = 201
         return ret

tests/test_lot.py

@@ -210,10 +210,15 @@ def test_post_get_lot(user: UserClient):
 
 def test_post_add_children_view(user: UserClient):
     """Tests adding children lots to a lot through the view."""
-    l, _ = user.post(({'name': 'Parent'}), res=Lot)
+    parent, _ = user.post(({'name': 'Parent'}), res=Lot)
     child, _ = user.post(({'name': 'Child'}), res=Lot)
-    l, _ = user.post({}, res=Lot, item='{}/children'.format(l['id']), query=[('id', child['id'])])
+    parent, _ = user.post({},
-    assert l['children'][0]['id'] == child['id']
+                          res=Lot,
+                          item='{}/children'.format(parent['id']),
+                          query=[('id', child['id'])])
+    assert parent['children'][0]['id'] == child['id']
+    child, _ = user.get(res=Lot, item=child['id'])
+    assert child['parents'][0]['id'] == parent['id']
 
 
 @pytest.mark.xfail(reason='Just develop the test')