Removing the "reserved keyword" from dynamodb update item node js - amazon-web-services

Question

I am able to SET values for reserved keywords but not able to remove certain keywords in dynamodb.
My expression is below. Not able to remove data if I give like this. But able to remove size though.
Invalid UpdateExpression: Attribute name is a reserved keyword; reserved keyword:data
{
ConditionExpression: "#id = :id",
ExpressionAttributeNames: {
"#id": "id",
“#name": “name",
},
ExpressionAttributeValues: {
":id": “1234566",
“:name": “John",
},
Key: {
id: "1234566",
},
ReturnValues: "ALL_NEW",
TableName: “table_name",
UpdateExpression: "SET #name = :name REMOVE size, data",
}
Modified to include data in expression attribute names as below. Still throws error.
{
ConditionExpression: "#id = :id",
ExpressionAttributeNames: {
"#id": "id",
“#name": “name",
“#size": “size",
“#data": “data",
},
ExpressionAttributeValues: {
":id": “1234566",
“:name": “John",
“:size": undefined,
“:data": undefined,
},
Key: {
id: "1234566",
},
ReturnValues: "ALL_NEW",
TableName: "table_name",
UpdateExpression: "SET #name = :name, #size = :size, #data =
:data REMOVE size, data”,
}

Answer 1

Remove size and data from ExpressionAttributeValues and from SET UpdateExpression. Add #size and #data to REMOVE on UpdateExpression instead of size and data.
{
ConditionExpression: "#id = :id",
ExpressionAttributeNames: {
"#id": "id",
“#name": “name",
“#size": “size",
“#data": “data",
},
ExpressionAttributeValues: {
":id": “1234566",
“:name": “John"
},
Key: {
id: "1234566",
},
ReturnValues: "ALL_NEW",
TableName: "table_name",
UpdateExpression: "SET #name = :name, REMOVE #size, #data”,
}

Answer 2

Reserved words in DynamoDB
to do that dynamically you need only to provide a json object with this function
it's create dynamically
-ExpressionAttributeNames
-ExpressionAttributeValues
-UpdateExpression
also skip reserved keyword for dynamodb
def generate_update_att(body):
"""
#############input
body={
'newval':newData['newval'],
'lastname':newData['lastname'],
'name':newData['name']
}
#################output
-ExpressionAttributeNames
-ExpressionAttributeValues
-UpdateExpression
"""
UpdateExpression = ["set "]
ExpressionAttributeValues = dict()
ExpressionAttributeNames=dict()
for key, val in body.items():
UpdateExpression.append(f" #{key} = :{key},")
ExpressionAttributeValues[f":{key}"] = val
ExpressionAttributeNames[f"#{key}"] = key
return "".join(UpdateExpression)[:-1], ExpressionAttributeValues,ExpressionAttributeNames
function Call
my_data={
'newval':newData['newval'],
'lastname':newData['lastname'],
'name':newData['name']
}
a, v,z = generate_update_att(my_data)
my_table.update_item(
Key={'id':my_id},
UpdateExpression=my_UpdateExpression,
ExpressionAttributeValues=dict(my_ExpressionAttributeValues),
ExpressionAttributeNames=dict(my_ExpressionAttributeNames)
)