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Boto3 list_append a value to overwrite a null value in a list
Boto3, python and how to handle errorsIs it possible to combine if_not_exists and list_append in update_itemIncrementing Number Property in AWS DynamoDB Objective CWhy does my AWS Lambda script return 'Instances' instead of the instance ID?dynamoDB update-item python boto3"EndpointConnectionError : unable to connect to endpoint https://lambda-xyz/wehwk.comLimit on Number of Attributes in Table DynamoDB?Lambda function blanks DynamoDB valuesAWS is complaining about a parameter being the wrong type, when it really is notC# serialize DynamoDB item to JSON
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I am writing a small lambda function to update a game item in my DynamoDB. My game item has a participants attribute which is a list consisting of the participant_id of each participant in the game. When a game doesn't have any participants yet (i.e. a round later in the bracket) the list will hold 2 null values:
I would like to overwrite the null values with a string each time I add a new participant. Currently I am able to append a new String to the list but the null values remain:
How can I overwrite one of the 2 null values with a string using boto3?
(i.e. to where it looks like ["participantOneId", Null] after adding one participant and ["participantOneId", "participantTwoId"] after adding both participants)
This is my current implementation:
import boto3
import json
dynamodb = boto3.resource("dynamodb")
gamesTable = dynamodb.Table('games')
def lambda_handler(event, context):
# get "next_game_id" and "winner_id" from the event body
updated_next_game = gamesTable.update_item(
Key='id': next_game_id ,
UpdateExpression="SET participants = list_append(participants, :i)",
ExpressionAttributeValues=
':i': [winner_id],
,
ReturnValues="ALL_NEW"
)
amazon-web-services aws-lambda amazon-dynamodb boto3
asked Mar 8 at 23:27
Andrew A.Andrew A.
440714
add a comment |
I am writing a small lambda function to update a game item in my DynamoDB. My game item has a participants attribute which is a list consisting of the participant_id of each participant in the game. When a game doesn't have any participants yet (i.e. a round later in the bracket) the list will hold 2 null values:
I would like to overwrite the null values with a string each time I add a new participant. Currently I am able to append a new String to the list but the null values remain:
How can I overwrite one of the 2 null values with a string using boto3?
(i.e. to where it looks like ["participantOneId", Null] after adding one participant and ["participantOneId", "participantTwoId"] after adding both participants)
This is my current implementation:
import boto3
import json
dynamodb = boto3.resource("dynamodb")
gamesTable = dynamodb.Table('games')
def lambda_handler(event, context):
# get "next_game_id" and "winner_id" from the event body
updated_next_game = gamesTable.update_item(
Key='id': next_game_id ,
UpdateExpression="SET participants = list_append(participants, :i)",
ExpressionAttributeValues=
':i': [winner_id],
,
ReturnValues="ALL_NEW"
)
amazon-web-services aws-lambda amazon-dynamodb boto3
asked Mar 8 at 23:27
Andrew A.Andrew A.
440714
Why store two Null values in the first place?
– jarmod
Mar 8 at 23:42
Good point @jarmod
– Andrew A.
Mar 11 at 17:16
add a comment |
I am writing a small lambda function to update a game item in my DynamoDB. My game item has a participants attribute which is a list consisting of the participant_id of each participant in the game. When a game doesn't have any participants yet (i.e. a round later in the bracket) the list will hold 2 null values:
I would like to overwrite the null values with a string each time I add a new participant. Currently I am able to append a new String to the list but the null values remain:
How can I overwrite one of the 2 null values with a string using boto3?
(i.e. to where it looks like ["participantOneId", Null] after adding one participant and ["participantOneId", "participantTwoId"] after adding both participants)
This is my current implementation:
import boto3
import json
dynamodb = boto3.resource("dynamodb")
gamesTable = dynamodb.Table('games')
def lambda_handler(event, context):
# get "next_game_id" and "winner_id" from the event body
updated_next_game = gamesTable.update_item(
Key='id': next_game_id ,
UpdateExpression="SET participants = list_append(participants, :i)",
ExpressionAttributeValues=
':i': [winner_id],
,
ReturnValues="ALL_NEW"
)
amazon-web-services aws-lambda amazon-dynamodb boto3
asked Mar 8 at 23:27
Andrew A.Andrew A.
440714
I am writing a small lambda function to update a game item in my DynamoDB. My game item has a participants attribute which is a list consisting of the participant_id of each participant in the game. When a game doesn't have any participants yet (i.e. a round later in the bracket) the list will hold 2 null values:
I would like to overwrite the null values with a string each time I add a new participant. Currently I am able to append a new String to the list but the null values remain:
How can I overwrite one of the 2 null values with a string using boto3?
(i.e. to where it looks like ["participantOneId", Null] after adding one participant and ["participantOneId", "participantTwoId"] after adding both participants)
This is my current implementation:
import boto3
import json
dynamodb = boto3.resource("dynamodb")
gamesTable = dynamodb.Table('games')
def lambda_handler(event, context):
# get "next_game_id" and "winner_id" from the event body
updated_next_game = gamesTable.update_item(
Key='id': next_game_id ,
UpdateExpression="SET participants = list_append(participants, :i)",
ExpressionAttributeValues=
':i': [winner_id],
,
ReturnValues="ALL_NEW"
)
amazon-web-services aws-lambda amazon-dynamodb boto3
amazon-web-services aws-lambda amazon-dynamodb boto3
asked Mar 8 at 23:27
Andrew A.Andrew A.
440714
asked Mar 8 at 23:27
Andrew A.Andrew A.
440714
asked Mar 8 at 23:27
Andrew A.Andrew A.
440714
asked Mar 8 at 23:27
Andrew A.Andrew A.
440714
asked Mar 8 at 23:27
Andrew A.Andrew A.
440714
440714
Why store two Null values in the first place?
– jarmod
Mar 8 at 23:42
Good point @jarmod
– Andrew A.
Mar 11 at 17:16
add a comment |
Why store two Null values in the first place?
– jarmod
Mar 8 at 23:42
Good point @jarmod
– Andrew A.
Mar 11 at 17:16
Why store two Null values in the first place?
– jarmod
Mar 8 at 23:42
Why store two Null values in the first place?
– jarmod
Mar 8 at 23:42
Good point @jarmod
– Andrew A.
Mar 11 at 17:16
Good point @jarmod
– Andrew A.
Mar 11 at 17:16
add a comment |
1 Answer
1
active
oldest
votes
If you don't need to append anything to the list, then you don't want to use list_append. Something like this should work fine:
UpdateExpression="SET participants[0] = <whatever>"
and/or
UpdateExpression="SET participants[1] = <whatever>"
(If you won't know in advance which of the two elements you need to set, you can always use if_not_exists.)
answered Mar 11 at 19:51
B. ShefterB. Shefter
429111
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
If you don't need to append anything to the list, then you don't want to use list_append. Something like this should work fine:
UpdateExpression="SET participants[0] = <whatever>"
and/or
UpdateExpression="SET participants[1] = <whatever>"
(If you won't know in advance which of the two elements you need to set, you can always use if_not_exists.)
answered Mar 11 at 19:51
B. ShefterB. Shefter
429111
add a comment |
If you don't need to append anything to the list, then you don't want to use list_append. Something like this should work fine:
UpdateExpression="SET participants[0] = <whatever>"
and/or
UpdateExpression="SET participants[1] = <whatever>"
(If you won't know in advance which of the two elements you need to set, you can always use if_not_exists.)
answered Mar 11 at 19:51
B. ShefterB. Shefter
429111
add a comment |
If you don't need to append anything to the list, then you don't want to use list_append. Something like this should work fine:
UpdateExpression="SET participants[0] = <whatever>"
and/or
UpdateExpression="SET participants[1] = <whatever>"
(If you won't know in advance which of the two elements you need to set, you can always use if_not_exists.)
answered Mar 11 at 19:51
B. ShefterB. Shefter
429111
If you don't need to append anything to the list, then you don't want to use list_append. Something like this should work fine:
UpdateExpression="SET participants[0] = <whatever>"
and/or
UpdateExpression="SET participants[1] = <whatever>"
(If you won't know in advance which of the two elements you need to set, you can always use if_not_exists.)
answered Mar 11 at 19:51
B. ShefterB. Shefter
429111
answered Mar 11 at 19:51
B. ShefterB. Shefter
429111
answered Mar 11 at 19:51
B. ShefterB. Shefter
429111
answered Mar 11 at 19:51
B. ShefterB. Shefter
429111
429111
add a comment |
add a comment |
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Why store two Null values in the first place?
– jarmod
Mar 8 at 23:42
Good point @jarmod
– Andrew A.
Mar 11 at 17:16