E07730: HTTP PATH variable count and PATH parameter count mismatch

What went wrong

The number of path variables in the URI pattern doesn't match the number of PATH parameters in the operation signature.

Worked examples

Compilable examples demonstrating this error and the correct fix:

• ek9 -q 946 (How must path variable counts match parameters in EK9 services?)

How to fix it

1. Declare one PATH parameter for each path variable in the URI
2. A parameter binds the variable of the same name, or the one named by :=: PATH "name"

The [EXAMPLE] section below shows two URI variables with one parameter, and the method taking both.

Common causes

• Missing parameter for a path variable
• Extra path variable without a parameter
• Typo in a variable name

See also

• E07730: path variable/parameter count mismatch (this error)
• E07731: path variable bound twice, or repeated in the URI
• E07700: invalid path parameter format

Examples

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

Fails with E07730: HTTP PATH variable count and PATH parameter count mismatch

#!ek9
defines module error.e07730.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

      //Two variables in the URI, one parameter
      byRoute() as GET for :/{region}/{route}
        -> region as String
        <- response as HTTPResponse: TextResponse(region)

Fixed: Declare a parameter for every URI variable

#!ek9
defines module error.e07730.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

      byRoute() as GET for :/{region}/{route}
        ->
          region as String
          route as String
        <- response as HTTPResponse: TextResponse(`${region} ${route}`)