Unable to use parameter reference for memory setting

[yoshiwaan]

If I have a parameters file called dev.yml with:

---
stageMemory: 128

and then a settings file for an application with

---
lambdas:
  helloworld:
    code: helloworld
    handler: code.handler
    runtime: python
    memory: ref://stageMemory

Then I get

user@machine:~/code/test4/demo$ gordon build
Loading project resources
Loading installed applications
  contrib_lambdas:
    ✓ lambdas:version
  firstapp:
    ✓ lambdas:helloworld
Building project...
  0001_p.json
  0002_pr_r.json
Traceback (most recent call last):
  File "/usr/local/bin/gordon", line 9, in <module>
    load_entry_point('gordon==0.2.1', 'console_scripts', 'gordon')()
  File "/usr/local/lib/python2.7/dist-packages/gordon/bin.py", line 106, in main
    getattr(obj, options.func)()
  File "/usr/local/lib/python2.7/dist-packages/gordon/core.py", line 243, in build
    self._build_resources_template()
  File "/usr/local/lib/python2.7/dist-packages/gordon/core.py", line 334, in _build_resources_template
    r.register_resources_template(template)
  File "/usr/local/lib/python2.7/dist-packages/gordon/resources/lambdas.py", line 275, in register_resources_template
    MemorySize=self.get_memory(),
  File "/usr/local/lib/python2.7/dist-packages/gordon/resources/lambdas.py", line 68, in get_memory
    memory = int(self.settings.get('memory', 128))
TypeError: int() argument must be a string or a number, not 'Ref'

This is because int() is being called at build time but references are set as parameters at deploy time, and you can't call int() on the reference type.

The documentation here seems to indicate it works as a reference: https://gordon.readthedocs.io/en/latest/lambdas.html#memory

Either the doc needs updating if this isn't supported or the int() needs to be called at deploy time as a check.

[yoshiwaan]

I realise now that parameters can't contain underscores, but that doesn't affect this particular case