schema.Resource with schema.TypeMap does not contain values

[Raphael Randschau]

Hey there!

I'm writing new AWS resources for the API Gateway for terraform. But I'm running into a problem which does not make sense to me.

The resource definition compiles & I can interact with the AWS API, but there's a parameter that needs to be of type `schema.TypeMap` and 

I only get the keys, not the values.

My resource definition looks like this: 

```

func resourceAwsApiGatewayMethod() *schema.Resource {

// snip …

"parameters": &schema.Schema{

Type:     schema.TypeMap,

Optional: true,

ForceNew: true,

},

}

```

To my understanding, given a terraform script like this:

```

resource "aws_api_gateway_method" "users-get" {

  parameters {

    integration.request.header.host = "value"

  }

}

```

should result in a map if one key: `integration.request.header.host`, and one value, `value`. However, I get a map with the correct key, and an empty string as value.

Now - why is that? I've taken a look at the existing resources, but they seem to operate just like my new resource and work properly.

Ideas are welcome - the entire source is available here: https://github.com/hashicorp/terraform/pull/4295

--

Raphael

[Paul Hinze]

Hi Raphael,

Sorry for the trouble here, and thanks for your work on this so far! I believe you're seeing this behavior because TypeMap does not support keys with dots in them. This is because the internal state storage format uses dot delimited fields to denote nesting.

Based on my reading of the API docs for the API Gateway Method, I'd recommend working around this limitation by switching parameters to a TypeSet with a few nested fields, something like this:

"parameter": &schema.Schema{

  Type: schema.TypeSet

  Elem: &schema.Resource{

    Schema: map[string]*schema.Schema{

      "location": &schema.Schema{ /* ... */ },

      "name": &schema.Schema{ /* ... */ },

      "required": &schema.Schema{ /* ... */ },

    }

  },

}

This would let users write config like this:

resource "aws_api_gateway_method" "users-get" {

  # ...

  parameter {

    location = "header"

    name     = "host"

    required = true

  }

  parameter {

    location = "querystring"

    name     = "apikey"

    required = false

  }

}

And you should be able to find plenty of examples elsewhere in the AWS provider to see how to interact with the *schema.Set you'll get back from d.Get("parameter").

Let me know if this makes sense to you!

Paul

--
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