make config tolerant to no value

[rafikt1992]

Hello,

I have been searching for a while to solve this problem

if my config.yaml is

#@ load("@ytt:data", "data")
foo: data.value.foo
bar: data.value.bar

and my value file is

#@data/values
---
foo: baz

how can I make my config.yam tolerate not defining bar in my value file without throwing an error structure has no xx field or method. and simply discard the key in the output file.

thank you

Edit:

I found a solution finally. One way to do it is to make a map of all the available keys in the value file since the value file is a struct using struct function mymap= dir(data.values) then test if the key exist. config.yaml should look like this:

#@ load("@ytt:data", "data")
 mymap= dir(data.values)
foo: data.value.foo
#@ if/end 'bar' in mymap:
bar: data.value.bar

[gcheadle-vmware]

Hi @rafikt1992 👋

I see your edit and that you have found a solution 👍
Some helpful documentation for this question lives in our FAQ doc under the Data Values section.
One note is that @ data.values is already a struct, thus it has a function to test the existence of a key, this function is hasattr():

#@ load("@ytt:data", "data")
foo: #@ data.value.foo
#@ if/end hasattr(data.values, "bar"):
bar: #@ data.value.bar