concatenate variables and strings in file lookup

[Colin Byrne]

Hey so I have a list of developer names in a dictionary and I am trying to do a file lookup on their ssh key, 

I want to dynamically build the file path for each key as opposed to specifying it the full path for each developer.

Here is my task:

---
  - name: Set up authorized_keys for the root user
    authorized_key: user=root key="{{ lookup('file', {{ role_path }} + '/files/public_keys/' + {{ item.1 }} ) }}"
    with_subelements:
      - ssh_users
      - names

I haven't been able to get those variables to evaluate within the file lookup (I have tried many other syntaxes to try to achieve this).  I know I am importing them properly as I can get them to evaluate outside of the file lookup with something like the following, but then they whole string is not evaluated as a file. 

---

  - name: Set up authorized_keys for the root user

   authorized_key: user=root key={{ role_path }} + '/files/public_keys/' + {{ item.1 }}

   with_subelements:

     - ssh_users

     - names

Here is my dictionary with the embedded lists:

---
ssh_users:
  - group: admin
    names:
       - bob
       - dave
  - group: developers
    names:
       - tim
       - susan
  - group: analysts
    names:
       - mike
       - steve

I am open to changing the task in an way shape or form to achieve this. 

Thanks for any help!    

[Brian Coca]

moustaches don't stack and concatenation (+) does not work outside moustaches:

authorized_key: user=root key="{{ lookup('file', role_path +

'/files/public_keys/' + item.1) }}"

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--
Brian Coca

[Colin Byrne]

Ha, awesome. Thanks a lot Brian, you are the man...