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#2627 - Change comparison to differentiate between 0 and None

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This commit is contained in:
Bert Blommers 2020-01-22 11:30:17 +00:00
parent 8c920cce10
commit 6f02782624
2 changed files with 46 additions and 4 deletions
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8
moto/dynamodb2/comparisons.py
View File

@ -977,7 +977,7 @@ class OpLessThan(Op):
lhs = self.lhs.expr(item)
rhs = self.rhs.expr(item)
# In python3 None is not a valid comparator when using < or > so must be handled specially
if lhs and rhs:
if lhs is not None and rhs is not None:
return lhs < rhs
else:
return False
@ -990,7 +990,7 @@ class OpGreaterThan(Op):
lhs = self.lhs.expr(item)
rhs = self.rhs.expr(item)
# In python3 None is not a valid comparator when using < or > so must be handled specially
if lhs and rhs:
if lhs is not None and rhs is not None:
return lhs > rhs
else:
return False
@ -1021,7 +1021,7 @@ class OpLessThanOrEqual(Op):
lhs = self.lhs.expr(item)
rhs = self.rhs.expr(item)
# In python3 None is not a valid comparator when using < or > so must be handled specially
if lhs and rhs:
if lhs is not None and rhs is not None:
return lhs <= rhs
else:
return False
@ -1034,7 +1034,7 @@ class OpGreaterThanOrEqual(Op):
lhs = self.lhs.expr(item)
rhs = self.rhs.expr(item)
# In python3 None is not a valid comparator when using < or > so must be handled specially
if lhs and rhs:
if lhs is not None and rhs is not None:
return lhs >= rhs
else:
return False

42
tests/test_dynamodb2/test_dynamodb.py
View File

@ -2531,6 +2531,48 @@ def test_condition_expressions():
)
@mock_dynamodb2
def test_condition_expression_numerical_attribute():
dynamodb = boto3.resource("dynamodb")
dynamodb.create_table(
TableName="my-table",
KeySchema=[{"AttributeName": "partitionKey", "KeyType": "HASH"}],
AttributeDefinitions=[{"AttributeName": "partitionKey", "AttributeType": "S"}],
)
table = dynamodb.Table("my-table")
table.put_item(Item={"partitionKey": "pk-pos", "myAttr": 5})
table.put_item(Item={"partitionKey": "pk-neg", "myAttr": -5})
# try to update the item we put in the table using numerical condition expression
# Specifically, verify that we can compare with a zero-value
# First verify that > and >= work on positive numbers
update_numerical_con_expr(
key="pk-pos", con_expr="myAttr > :zero", res="6", table=table
)
update_numerical_con_expr(
key="pk-pos", con_expr="myAttr >= :zero", res="7", table=table
)
# Second verify that < and <= work on negative numbers
update_numerical_con_expr(
key="pk-neg", con_expr="myAttr < :zero", res="-4", table=table
)
update_numerical_con_expr(
key="pk-neg", con_expr="myAttr <= :zero", res="-3", table=table
)
def update_numerical_con_expr(key, con_expr, res, table):
table.update_item(
Key={"partitionKey": key},
UpdateExpression="ADD myAttr :one",
ExpressionAttributeValues={":zero": 0, ":one": 1},
ConditionExpression=con_expr,
)
table.get_item(Key={"partitionKey": key})["Item"]["myAttr"].should.equal(
Decimal(res)
)
@mock_dynamodb2
def test_condition_expression__attr_doesnt_exist():
client = boto3.client("dynamodb", region_name="us-east-1")