Tags Helper
The tags helper adds several conveniences.
Convenience Form
Provide tags with a simple hash:
tags(Name: "test")
And it conveniently generates the typical CloudFormation Tags property structure.
Tags:
- Key: Name
Value: test
If you prefer to be explicitly you can provide the standard form also. Example:
tags([{Key: "Name", Value: "test"}])
PropagateAtLaunch Special Key
For most resources, the CloudFormation Tags structure is an Array of Hashes with Key and Value elements. For the AWS::AutoScaling::AutoScalingGroup TagProperty, there is an additional required key: PropagateAtLaunch.
The tags helper method can automatically add PropagateAtLaunch key to all the Hash elements. Example:
tags(Name: "test", Env: "dev", PropagateAtLaunch: true)
Results in:
Tags:
- Key: Name
PropagateAtLaunch: true
Value: test
- Key: Env
PropagateAtLaunch: true
Value: dev
Tags Variables Inference
The tags helper method can also infer it’s value from variables configs. Example:
config/blueprints/demo/vars/dev.rb:
@tags = {Name: "test", Env: "dev"}
Then in the template, call tags without any arguments to tell it to infer the value from variables.
tags
This generates
Tags:
- Key: Name
Value: test
- Key: Env
Value: dev