Is there support for
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?
@manjotmona you can totally write your own
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)
Hey, any idea when the next version of scanamo will be released? Very interested in the changes in scanamo/scanamo#432 (upgrading the ZIO dependencies)
As right now when I tried with optional value, then I got the following error
Invalid FilterExpression: An expression attribute value used in expression is not defined; attribute value: :and_l_and_l_and_l_and_r_conditionAttributeValue0 (Service: dynamodb; Status Code: 400; Error Code: ValidationException; Request ID: 787abdcf-70cf-4a8e-ba2a-5ae9be1310cf
@AyushTiwary can you post a snippet of code please?
Hello there !
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
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
My request works if I write something like usageIndex.query('PhotoId -> "123"), but can't work with a set of values. I tried to build an Or Condition from my ids list, but I failed also
hmm, yeah that won’t work, the partition key must be a scalar. check out https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.CoreComponents.html#HowItWorks.CoreComponents.PrimaryKey
I have a ridiculously basic question about Scanamo - I'm trying to use ScanamoAlpakka in order to get a akka.stream.scaladsl.Source, and the Scaladoc says this is possible, depending on the "kind of execution used" - I can't find any examples in the docs, and am struggling a bit. Has anyone done this, and if so, where can I find the docs on how to do it?
i have
import org.scanamo.semiauto._
import org.scanamo.syntax._
i think it's because my type has
Instant in it
eh, removed
Instant and it still doesn't like it
like if i have
sealed trait Thing
case class Foo(a: Int, b: String) extends Thing
case class Bar(a: Long, b: String, c: Int) extends Thing
val thingTable: Table[Thing] = Table[Thing]("thing_table")(deriveDynamoFormat[Thing])genericProduct | genericCoProduct
both are in scope
if I provide one explicitly I see
could not find implicit value for parameter gen: shapeless.LabelledGeneric.Aux[T,R]
here is a reproduction