def test_schemaless_apply_changes():
cat = {"name": "Gordon"}
types = {"name": str, "age": int, "color": str}
permitted = types.keys()
changeset = Changeset((cat, types)).cast({"color": "brown", "age": 14}, permitted)
assert changeset.apply_changes() == {"name": "Gordon", "age": 14, "color": "brown"}
def test_validate_change_only_validates_if_field_is_changed():
changeset = (
Changeset(Person())
.cast({"name": "Richard"}, ["name"])
.validate_change("age", is_30)
)
assert changeset.is_valid
def test_cast_type_check(key, val, valid, error):
changeset = Changeset(Book()).cast({key: val}, [key])
if valid:
assert changeset.is_valid
assert changeset.changes[key] == val
else:
assert changeset.errors[key] == [error]
def test_put_change():
assert (
Changeset(Book())
.cast({"title": "The Idiot"}, ["title"])
.put_change("isbn", "01234567890")
.changes["isbn"]
) == "01234567890"
def test_put_assoc_with_dict_data_is_invalid():
user = User(id=1, name="Bear")
with pytest.raises(ValueError):
(
Changeset(({}, {}))
.cast({"name": "Big Blue House"}, ["name"])
.put_assoc("owner", user)
)
def test_put_assoc():
user = User(id=1, name="Bear")
changeset = (
Changeset(Home())
.cast({"name": "Big Blue House"}, ["name"])
.put_assoc("owner", user)
)
assert changeset.changes == {"owner_id": 1, "name": "Big Blue House"}
def test_schemaless_invalid():
cat = {"name": "Gordon"}
types = {"name": str, "age": int, "color": str}
permitted = types.keys()
changeset = Changeset((cat, types)).cast(
{"color": "brown", "age": "fourteen"}, permitted
)
assert changeset.errors == {"age": ["Not a valid integer."]}
def test_change_allows_one_to_add_invalid_changes():
changeset = (
Changeset(Person())
.cast({"name": "Richard"}, ["name"])
.validate_change("age", is_30)
.change({"id": "foo"})
)
assert changeset.changes["id"] == "foo"
def cast_changeset(model_or_changeset: Union[Model, Changeset]) -> Changeset:
if isinstance(model_or_changeset, Model):
changes = model_or_changeset.attributes
empty_model = type(model_or_changeset)()
return Changeset(empty_model).cast(changes, list(changes.keys()))
elif isinstance(model_or_changeset, Changeset):
return model_or_changeset
else:
raise ValueError("Must be Model instance or Changeset.")
def test_validate_exclusion_valid():
assert (
Changeset(Person())
.cast(
{"name": "Richard", "age": 30, "favorite_animal": "weasel"},
["name", "age", "favorite_animal"],
)
.validate_exclusion("favorite_animal", ["spider"])
).is_valid
def test_validate_change():
changeset = (
Changeset(Person())
.cast({"name": "Richard", "age": 31}, ["name", "age"])
.validate_change("age", is_30)
)
assert changeset.errors == {
"age": ["not 30"],
}
def test_cast_custom_empty_values():
empty_value = "this is actually empty"
not_empty_value = ""
assert (
Changeset(Book()).cast(
{"title": empty_value, "slug": not_empty_value},
["title", "slug"],
empty_values=[empty_value],
)
).changes == {"slug": not_empty_value}
def test_validate_inclusion_invalid():
changeset = (
Changeset(Person())
.cast(
{"name": "Richard", "age": 30, "favorite_animal": "bat"},
["name", "age", "favorite_animal"],
)
.validate_inclusion("favorite_animal", ["weasel"], "not a weasel")
)
assert changeset.errors == {"favorite_animal": ["not a weasel"]}
def test_on_changed_when_changing_value_to_none():
params = {
"title": None,
"publication_date": date(1866, 1, 1),
}
changeset = (
Changeset(Book(title="Crime and Punishment"))
.cast(params, ["title", "publication_date"])
.on_changed("title", lambda cs, v: cs.put_change("slug", "slug-removed"))
)
assert changeset.changes.get("slug") == "slug-removed"
def test_validate_exclusion_invalid():
changeset = (
Changeset(Person())
.cast(
{"name": "Richard", "age": 30, "favorite_animal": "spider"},
["name", "age", "favorite_animal"],
)
.validate_exclusion(
"favorite_animal", ["spider"], "def not your favorite animal"
)
)
assert changeset.errors == {"favorite_animal": ["def not your favorite animal"]}
def test_on_changed_with_no_change():
def _slugify(changeset, title):
return changeset.put_change("slug", title.lower().replace(" ", "-"))
params = {
"publication_date": date(1866, 1, 1),
}
changeset = (
Changeset(Book(title="Crime and Punishment"))
.cast(params, ["title", "publication_date"])
.on_changed("title", _slugify)
)
assert changeset.changes.get("slug") is None
def test_on_changed():
def _slugify(changeset, title):
return changeset.put_change("slug", title.lower().replace(" ", "-"))
params = {
"title": "Crime and Punishment",
"publication_date": date(1866, 1, 1),
}
book = (
Changeset(Book())
.cast(params, ["title", "publication_date"])
.on_changed("title", _slugify)
.apply_changes()
)
assert book.slug == "crime-and-punishment"
async def update(self, changeset: Changeset) -> Model:
"""
Update a record in the database.
Examples::
user = await repo.get(User, 1)
changeset = Changeset(user).cast({"name": "Fred"}, params=["name"])
await repo.update(changeset)
"""
if not changeset.is_valid:
raise InvalidChangesetError(action="update", changeset=changeset)
record = changeset.data
query = record.to_query()
sql = query.to_update_sql().values(changeset.changes)
await self.database.execute(sql)
return changeset.apply_changes()
def _put_foo(changeset: Changeset) -> Changeset:
return changeset.put_change("foo", "bar")
def test_validate_length_no_params():
assert (
Changeset(Book()).cast({"isbn": "123456789"}, ["isbn"]).validate_length("isbn")
).is_valid
def test_cast_default_empty_values():
params = {"title": "", "slug": "not-empty", "pages": None}
assert (Changeset(Book()).cast(params, ["title", "slug", "pages"])).changes == {
"slug": "not-empty",
}
def test_cast_unknown_type():
changeset = Changeset(User()).cast({"unknown": 1}, ["unknown"])
assert changeset.changes == {}
def test_cast_param_same_as_data():
assert (
Changeset(Book(title="Great Expectations")).cast(
{"title": "Great Expectations"}, ["title"]
)
).changes == {}
def test_cast_empty():
changeset = Changeset(User()).cast({}, [])
assert changeset.is_valid
assert changeset.changes == {}
def test_cast():
changeset = Changeset(User()).cast({"name": "Richard", "foo": "bar"}, ["name"])
assert changeset.is_valid
assert changeset.changes == {"name": "Richard"}
def test_invalid_data():
with pytest.raises(AttributeError):
Changeset("foo")
def test_get_change_found():
assert (Changeset(Book()).put_change("foo", "bar").get_change("foo")) == "bar"
def test_pipe():
def _put_foo(changeset: Changeset) -> Changeset:
return changeset.put_change("foo", "bar")
assert Changeset(Book()).pipe(_put_foo).changes == {"foo": "bar"}
def test_get_change_not_found_custom_value():
assert (Changeset(Book()).get_change("foo", "baz")) == "baz"
def test_get_change_not_found_default_value():
assert (Changeset(Book()).get_change("foo")) is None