TYPO3 Fluid Array Access

Question

I have a question to access an array in fluid:

Associative Array {registrationProcess}
STRING  {fieldname} == 'firstName'
STRING  {property} == 'participant'
WORKING {registrationProcess.participant.{fieldname}}
WORKING {registrationProcess.{property}.firstName}
WORKING {registrationProcess.participant.firstName}
NULL    {registrationProcess.{property}.{fieldname}}

Why is the result of the last notation NULL???

Answer 1

Fluid currently only supports one dynamic property per level. Fluid 3.0 will change that but until that time, you have to extract the first dynamic expression to a variable and then perform the second dynamic expression on that new variable:

<f:variable
  name="registrationProperty"
  value="{registrationProcess.{property}}"
/>

{registrationProperty.{fieldname}}