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#2580 - DynamoDB update_item: Allow list_append and if_not_exists-functions in one expression

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This commit is contained in:
Bert Blommers 2020-02-09 11:47:02 +00:00
commit 936d686392
2 changed files with 36 additions and 6 deletions
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17
moto/dynamodb2/models.py
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@ -448,13 +448,18 @@ class Item(BaseModel):
if list_append_re:
new_value = expression_attribute_values[list_append_re.group(2).strip()]
old_list_key = list_append_re.group(1)
# Get the existing value
old_list = self.attrs[old_list_key.split(".")[0]]
if "." in old_list_key:
# Value is nested inside a map - find the appropriate child attr
old_list = old_list.child_attr(
".".join(old_list_key.split(".")[1:])
# old_key could be a function itself (if_not_exists)
if old_list_key.startswith("if_not_exists"):
old_list = DynamoType(
expression_attribute_values[self._get_default(old_list_key)]
)
else:
old_list = self.attrs[old_list_key.split(".")[0]]
if "." in old_list_key:
# Value is nested inside a map - find the appropriate child attr
old_list = old_list.child_attr(
".".join(old_list_key.split(".")[1:])
)
if not old_list.is_list():
raise ParamValidationError
old_list.value.extend([DynamoType(v) for v in new_value["L"]])