Use of condition with 'serial' in ansible

I'm looking to use a condition for use with serial option in ansible.

The current line is :
serial: '{{ serial_var | default("0") }}'

I would like something like the following but I'm unsure if of syntax:
serial: '{{ serial_var | "0" if action == "deploy" else "1" if action == "upgrade" }}'

The following works but I would prefer not to have both in my file.

- hosts: [mysqlcluster-ndb, mysqlcluster-api]
  serial: '{{ serial_var | default("0") }}'
  roles:
    - { role: mysqlcluster, tags: mysqlcluster, when: enable_mysqlcluster | bool }

- hosts: [mysqlcluster-ndb, mysqlcluster-api]
  serial: 1
  roles:
    - { role: mysqlcluster, tags: mysqlcluster, when: enable_mysqlcluster | bool and action | default('upgrade') }
micktAsked:
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micktConnect With a Mentor Author Commented:
Seems as if dropping the serial var is all that is required.

serial: '{{ "0" if action == "deploy" else "1" if action == "upgrade" }}'

values can be changed to % if preferable, e.g. "1" -> "30%"
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micktAuthor Commented:
Error in above, should be:

serial: '{{ "0" if action == "deploy" else "1" }}'
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