Open lucasoares opened 3 months ago
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1.12.2
Is this really the Viper version you are using? It's pretty old.
I just ran your test locally, and it passed.
The reason for that is you read the JSON configuration first, which will populate Viper with those keys. Bind struct is not in play here.
If you remove the ReadConfig
part, the test does fail, but there is an explanation: mapstructure can't distinguish between maps and structs which means any keys missing from the encoded version will also be missing from automatic env (as you point out in your analysis).
I'm not quite sure what the right solution is in this case. Maybe some sort of glob matching to allow manually bind env vars without having to specify the map keys?
In any case, the above test should work if you have those values defined in a config file.
Preflight Checklist
Viper Version
1.12.2
Go Version
1.22.1
Config Source
Environment variables, Files
Format
JSON
Repl.it link
No response
Code reproducing the issue
Expected Behavior
It should be possible to bind map values through environment variables.
Actual Behavior
The environment variable is not considered.
Steps To Reproduce
Execute the code I provided.
Additional Information
When coding this, I thought it would be hard for Viper to consider this complex structure. How will the code know the map's key from the environment variable? Maybe it should have a specific separator for map keys? Like
EXAMPLE_MAP_DATA__FIRST__ENABLED
instead ofEXAMPLE_MAP_DATA_FIRST_ENABLED
? I don't know if I'm doing something wrong here.I didn't manage to create a new map key from an environment variable. I think the documentation for environment variables when using maps, slices, etc is kind of outdated and must be updated. I'm doing trial-error for several minutes trying to make this work and I don't have any idea if I'm in the right direction.