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How to properly use list_append to keep values unique in DynamoDB?


How to properly use list_append to keep values unique in DynamoDB?

By : Sasha Korolkov
Date : October 14 2020, 02:21 PM
will be helpful for those in need To the best of my knowledge, you need to use a Set instead of a List of contact IDs to achieve what you want in only one call to DynamoDB. That being said, there are two ways to accomplish it with a Set, and it is possible to do this with a list if you’re okay making a read before you save the new contact.
Option 1
code :
ADD #contacts :contact
attribute_not_exists(#contacts) OR NOT contains(#contacts, :contact)
UpdateExpression: “SET #contacts = :updatedContacts”
ConditionExpression: "#contacts = :oldContacts”
UpdateExpression: “SET #contacts = :updatedContacts, #version = :newVersion”,
ConditionExpression: “#version = :oldVersion”


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Getting a list of unique hash key values from dynamodb using boto

Getting a list of unique hash key values from dynamodb using boto


By : Yashu Rastogi
Date : March 29 2020, 07:55 AM
Does that help I want to get a list of unique hash key values for a dynamodb table. The only way that I know to do it currently is to scan the entire table and then iterate over the scan. What is the better way?
code :
rs = list(table.scan(range__eq="rangevalue"))
for i in rs:
    print i['primarykey']
DynamoDB : SET list_append not working using aws sdk

DynamoDB : SET list_append not working using aws sdk


By : Jyrki Kuusisto
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , list_append can be read as a "concatenate" operation. You just give it two lists.
code :
"UpdateExpression" : "SET #attrName = list_append(#attrName, :attrValue)",
"ExpressionAttributeNames" : {
  "#attrName" : "entries"
},
"ExpressionAttributeValues" : {
  ":attrValue" : ["000989"]
}
list_append causing duplicates in Map. if list_append called for for existing keys in DynamoDB

list_append causing duplicates in Map. if list_append called for for existing keys in DynamoDB


By : Manoj
Date : March 29 2020, 07:55 AM
wish helps you As you have a MAP inside the LIST, the API expects the index of the list (something like below). In Java terms, the data type of daily is List>.
When you just say "daily.stringvalue" (i.e. daily."test.com"), it can't find the String value as there is an object (i.e. MAP) present inside the LIST rather than just a STRING value.
code :
"attribute_not_exists (daily[0].#k1)"
fetch unique values of item from dynamoDB using python

fetch unique values of item from dynamoDB using python


By : omar ajili
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Untested code. So tweak it as necessary.
Instead of creating a new list every time, just append it. You will see many order of magnitude in speed.
code :
pricelist.append(data['Item']['price'])
import boto3
dynamodb = boto3.resource('dynamodb')
table = dynamodb.Table('women_kurta')
pricelist = [table.get_item(Key={'id':i})['Item']['price'] for i in xrange(50)]
print list(set(pricelist))
DynamoDB: Is adding an item using list_append atomic?

DynamoDB: Is adding an item using list_append atomic?


By : user7370
Date : March 29 2020, 07:55 AM
wish helps you All single-item updates to items using the UpdateItem API are atomic. Therefore, using list_append() in an UpdateExpression is also atomic.
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