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[Martin Paulo <martin.paulo@xxxxxxxxx>]

Public bug reported:

We have just upgraded from Juno to Liberty.

A heat template (that used to work in Juno) declares the following parameter:
  instance_type:
    type: string
    description: The flavour the webserver is to run on
    default: m2.xsmall
    constraints:
      - allowed_values: [m2.xsmall, m2.small, m1.small]
        description:
          Must be a valid flavour, limited to the smaller ones available
      - custom_constraint: nova.flavor

When I try to load it via the dashboard, the drop down for the parameter no longer shows the allowed values, instead now listing all of the possible values. And when I select a value and launch the stack, I get the error message:
Error: ERROR: Parameter 'instance_type' is invalid: Must be a valid NeCTAR flavour, limited to the smaller ones available
And the stack fails to launch.

However, it launches quite happily from the command line.

If I comment either of the constraints out, the template works in the
dashboard.

If I comment out the allowed_values constraint, I get a list of the
flavors that I can select. So I'm guessing that you have written some
helpful code to list the available flavors if I constrain it to
nova.flavors: and that this is clashing with the allowed_values
somehow...

** Affects: horizon
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1521038

Title:
  When I launch a heat template with constraints custom_constraint and
  allowed_values on one parameter it fails

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  We have just upgraded from Juno to Liberty.

  A heat template (that used to work in Juno) declares the following parameter:
    instance_type:
      type: string
      description: The flavour the webserver is to run on
      default: m2.xsmall
      constraints:
        - allowed_values: [m2.xsmall, m2.small, m1.small]
          description:
            Must be a valid flavour, limited to the smaller ones available
        - custom_constraint: nova.flavor

  When I try to load it via the dashboard, the drop down for the parameter no longer shows the allowed values, instead now listing all of the possible values. And when I select a value and launch the stack, I get the error message:
  Error: ERROR: Parameter 'instance_type' is invalid: Must be a valid NeCTAR flavour, limited to the smaller ones available
  And the stack fails to launch.

  However, it launches quite happily from the command line.

  If I comment either of the constraints out, the template works in the
  dashboard.

  If I comment out the allowed_values constraint, I get a list of the
  flavors that I can select. So I'm guessing that you have written some
  helpful code to list the available flavors if I constrain it to
  nova.flavors: and that this is clashing with the allowed_values
  somehow...

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