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add comment about splitting update expression by operator keywords

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This commit is contained in:
Peter Gorniak 2017-06-15 15:34:58 -07:00
parent b713eef491
commit a0471b0407
1 changed files with 3 additions and 0 deletions
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moto/dynamodb2/models.py
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@ -116,7 +116,10 @@ class Item(BaseModel):
} }
def update(self, update_expression, expression_attribute_names, expression_attribute_values): def update(self, update_expression, expression_attribute_names, expression_attribute_values):
# Update subexpressions are identifiable by the operator keyword, so split on that and
# get rid of the empty leading string.
parts = [p for p in re.split(r'\b(SET|REMOVE|ADD|DELETE)\b', update_expression) if p] parts = [p for p in re.split(r'\b(SET|REMOVE|ADD|DELETE)\b', update_expression) if p]
# make sure that we correctly found only operator/value pairs
assert len(parts) % 2 == 0, "Mismatched operators and values in update expression: '{}'".format(update_expression) assert len(parts) % 2 == 0, "Mismatched operators and values in update expression: '{}'".format(update_expression)
for action, valstr in zip(parts[:-1:2], parts[1::2]): for action, valstr in zip(parts[:-1:2], parts[1::2]):
values = valstr.split(',') values = valstr.split(',')