Maybe somebody had this issue perviously:
https://stackoverflow.com/questions/54665643/local-dynamodb-unable-to-execute-http-request-connection-refused
hi guys, I recently found an interesting issue which I can't really explain but maybe somebody here has seen something similar. I use tagless final with scanamo and cats interpreters with IO monad. I once added a new field to my case class and everything compiled fine but my application stuck completely during test run when IOs unsafeRunSync method was called so it looked like there is some kind of lock somewhere which prevented the tests from being finished. I spent some hours debugging this issue unless I was close to give up and tried to summon the DynamoFormat for my case class somewhere in code to just print it out, so I wrote
implicitly[DynamoFormat[MyCaseClass]]and my tests went through... I was like wtf, I removed that line and it still worked even after "sbt clean". Then this issue happened some time later to my colleagues when we added more fields and run our web app locally, we tried to debug it this time to see what might be the problem but its a bit hard with these shapeless autoderivation, trampolining from IO and other stuff being lazy... The only thing we found that time was that asw sdk returned the result but then things stuck somewhere probably during decoding the response from aws sdk to case class. I applied the same trick with implicitly again and it solved the issue but I still have no idea whats going on here, its clear to me that it has something to do with derivation but I've never seen anything like that before. Has anybody seen something similar?
table.given(Not(condition)) should work
if_not_exists in updates (per https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.UpdateExpressions.html#Expressions.UpdateExpressions.SET.PreventingAttributeOverwrites)? Looked through the code and my reading is "no". Would it be reasonable to add a setIfNotExists method to UpdateExpression and then plumbing it through?
DynamoFormat[Sample]:new DynamoFormat[Sample]{
def write(v: Sample) = DynamoValue.fromFields(‘CAPITAL_SNAKE_CASE’, DynamoValue.fromString(v.paraName))
def read(dv: DynamoValue) = (for {
o <- dv.asObject
p <- o(‘CAPITAL_SNAKE_CASE’)
} yield Sample(p)).toEither(MissingProperty)
I've tried for hours to make a simple query with Scanamo, but I didn't succeed.
I would live to make a query with a constraint on a column : the value must be in a set.
I tried something like : usageIndex.query('PhotoId -> ids.map(_.value)) but that returns no result at all.
There's an implicit method creating a ConditionExpression[(AttributeName, Set[V])], so I'm running this way...
If you have time to help me, I really appreciate ! Thank you
