E07760: only Integer, String, Date, Time, DateTime, Milliseconds, Duration, HTTPRequest and HTTPContext supported

Category: E07xxx Full resolution · Reported in phase: EXPLICIT_TYPE_SYMBOL_DEFINITION · Classification: SERVICE_INCOMPATIBLE_PARAM_TYPE · All error codes

What went wrong

A service method parameter uses an unsupported type.

Worked examples

Compilable examples demonstrating this error and the correct fix:

ek9 -q 846 (Why can't I use Float as a service method parameter in EK9?)

Supported service parameter types

Integer, String
Date, Time, DateTime
Milliseconds, Duration
HTTPRequest (for full request access)

How to fix it

Use supported parameter types
For complex data, use HTTPRequest and parse body

Examples

Every example is compiled by the EK9 compiler: the first fails exactly as captioned, the others fix it.

Fails with E07760: only Integer, String, Date, Time, DateTime, Milliseconds, Duration, HTTPRequest and HTTPContext supported

#!ek9
defines module error.e07760.bad

  defines class

    TextResponse with trait of HTTPResponse
      text as String?

      default private TextResponse()

      TextResponse()
        -> body as String
        this.text: body

      override contentType() as pure
        <- rtn as String: "text/plain"

      override content()
        <- rtn as Bytes: Bytes().withUtf8(text)

      override status() as pure
        <- rtn as Integer: 200

      default operator ?

  defines service

    Addresses for :/addresses open

      byAmount() as GET for :/amount
        ->
          //A Float cannot be bound from a URI
          amount as Float :=: QUERY "amount"
        <- response as HTTPResponse: TextResponse($amount)

Fixed: Use a type that can be bound

#!ek9
defines module error.e07760.good

  defines class

    TextResponse with trait of HTTPResponse
      text as String?

      default private TextResponse()

      TextResponse()
        -> body as String
        this.text: body

      override contentType() as pure
        <- rtn as String: "text/plain"

      override content()
        <- rtn as Bytes: Bytes().withUtf8(text)

      override status() as pure
        <- rtn as Integer: 200

      default operator ?

  defines service

    Addresses for :/addresses open

      //Integer, String, Date, Time, DateTime, Milliseconds and Duration can be bound
      search() as GET for :/{index-number}/search
        ->
          queryId as Integer :=: PATH "index-number"
          fromDate as Date :=: QUERY "from"
          span as Duration :=: QUERY "duration"
          timeOut as Millisecond :=: QUERY "time-out"
        <- response as HTTPResponse: TextResponse(`${queryId} ${fromDate} ${span} ${timeOut}`)

Questions and answers

These Q&A entries show E07760 and its fix:

Q846: Why can't I use Float as a service method parameter in EK9?