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Document the data source interpolation usage (#14144) 

* Document the data source interpolation usage

Also briefly mentions how to use counts and splat syntax as with resources to further document the usage of counts for data sources (see https://github.com/hashicorp/terraform/pull/14143).

* Output -> Attribute

As per feedback.
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Tom Elliff 2017-05-02 15:17:24 +01:00 committed by Radek Simko
parent 64cd64d061
commit 551eedcf26
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website/source/docs/configuration/interpolation.html.md
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@ -61,6 +61,13 @@ attribute set, you can access individual attributes with a zero-based
index, such as `${aws_instance.web.0.id}`. You can also use the splat
syntax to get a list of all the attributes: `${aws_instance.web.*.id}`.
#### Attributes of a data source
The syntax is `data.TYPE.NAME.ATTRIBUTE`. For example. `${data.aws_ami.ubuntu.id}` will interpolate the `id` attribute from the `aws_ami` [data source](/docs/configuration/data-sources.html) named `ubuntu`. If the data source has a `count`
attribute set, you can access individual attributes with a zero-based
index, such as `${data.aws_subnet.example.0.cidr_block}`. You can also use the splat
syntax to get a list of all the attributes: `${data.aws_subnet.example.*.cidr_block}`.
#### Outputs from a module
The syntax is `MODULE.NAME.OUTPUT`. For example `${module.foo.bar}` will