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website: note about map/var merging

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Mitchell Hashimoto 2016-12-10 15:05:58 -05:00
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website/source/docs/configuration/variables.html.md
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@ -294,7 +294,39 @@ terraform apply -var-file=foo.tfvars -var-file=bar.tfvars
on the command line. If a variable is defined in more than one variable file,
the last value specified is effective.
### Precedence example
### Variable Merging
When variables are conflicting, map values are merged and all are values are
overridden. Map values are always merged.
For example, if you set a variable twice on the command line:
```
terraform apply -var foo=bar -var foo=baz
```
Then the value of `foo` will be `baz` since it was the last value seen.
However, for maps, the values are merged:
```
terraform apply -var 'foo={foo="bar"}' -var 'foo={bar="baz"}'
```
The resulting value of `foo` will be:
```
{
foo = "bar"
bar = "baz"
}
```
There is no way currently to unset map values in Terraform. Whenever a map
is modified either via variable input or being passed into a module, the
values are always merged.
### Variable Precedence
Both these files have the variable `baz` defined: