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mandatory keyed attribute

Aritra

Hi ,

     How to set a mandarory keyed attribute in procedure ? If I use "@key" before any attribute it automatically becomes an optional one. In some inbuilt form functions (like hiCreateAppForm ?name is mandatory keyed field) it exists. Can we make something similar for our use ?  

Parents

  •  Hi Aritra,

    One way that you could emulate the behaviour of hiCreateAppForm's requirement of a key parameter is to give the parameter a known unwanted (bogus) default value and then test for this value in the procedure body, something like the following example:

    
  procedure(CCFprocTest(@key (requiredParam 'notSupplied))
    
    when(requiredParam=='notSupplied
    
      error("CCFprocTest: required parameter 'requiredParam' was not supplied")
    
    ); when
    
    ...
    
  ); procedure

     You could alternatively check against the 'unbound symbol - if the parameter is unbound it was not supplied (test using boundp() ) and perhaps set the parameter internally to a desired default value if this is not truly an error condition.

    I hope that this helps you.

    Regards,

    Lawrence.

Reply

  •  Hi Aritra,

    One way that you could emulate the behaviour of hiCreateAppForm's requirement of a key parameter is to give the parameter a known unwanted (bogus) default value and then test for this value in the procedure body, something like the following example:

    
  procedure(CCFprocTest(@key (requiredParam 'notSupplied))
    
    when(requiredParam=='notSupplied
    
      error("CCFprocTest: required parameter 'requiredParam' was not supplied")
    
    ); when
    
    ...
    
  ); procedure

     You could alternatively check against the 'unbound symbol - if the parameter is unbound it was not supplied (test using boundp() ) and perhaps set the parameter internally to a desired default value if this is not truly an error condition.

    I hope that this helps you.

    Regards,

    Lawrence.

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