delete unknown values from apply config altogether

removeConfigUnknowns need to remove the value completely from the config
map. Removing this value allows GetOk and GetOkExists to indicate if the
value was set in the config in the case of an Optional+Computed
attribute.

builtin/providers/test/resource.go

@@ -141,6 +141,13 @@ func testResource() *schema.Resource {
 				Computed:    true,
 				Description: "copied the required field during apply, and plans computed when changed",
 			},
+			// this should return unset from GetOkExists
+			"get_ok_exists_false": {
+				Type:        schema.TypeBool,
+				Computed:    true,
+				Optional:    true,
+				Description: "do not set in config",
+			},
 		},
 	}
 }
@@ -186,6 +193,12 @@ func testResourceRead(d *schema.ResourceData, meta interface{}) error {
 		d.Set("set", []interface{}{})
 	}
 
+	// This should not show as set unless it's set in the config
+	_, ok := d.GetOkExists("get_ok_exists_false")
+	if ok {
+		return errors.New("get_ok_exists_false should not be set")
+	}
+
 	return nil
 }
 

builtin/providers/test/resource_test.go

@@ -973,3 +973,22 @@ resource "test_resource" "bar" {
 		},
 	})
 }
+
+func TestResource_optionalComputedBool(t *testing.T) {
+	resource.UnitTest(t, resource.TestCase{
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckResourceDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: strings.TrimSpace(`
+resource "test_resource" "foo" {
+	required = "yep"
+	required_map = {
+	    key = "value"
+	}
+}
+				`),
+			},
+		},
+	})
+}

helper/schema/shims.go

@@ -51,7 +51,7 @@ func removeConfigUnknowns(cfg map[string]interface{}) {
 		switch v := v.(type) {
 		case string:
 			if v == config.UnknownVariableValue {
-				cfg[k] = ""
+				delete(cfg, k)
 			}
 		case []interface{}:
 			for _, i := range v {

helper/schema/shims_test.go

@@ -3643,22 +3643,17 @@ func TestRemoveConfigUnknowns(t *testing.T) {
 	}
 
 	expect := map[string]interface{}{
-		"id": "",
 		"route_rules": []interface{}{
 			map[string]interface{}{
-				"cidr_block":        "",
 				"destination":       "0.0.0.0/0",
 				"destination_type":  "CIDR_BLOCK",
 				"network_entity_id": "1",
 			},
 			map[string]interface{}{
-				"cidr_block":       "",
 				"destination":      "0.0.0.0/0",
 				"destination_type": "CIDR_BLOCK",
 				"sub_block": []interface{}{
-					map[string]interface{}{
-						"computed": "",
-					},
+					map[string]interface{}{},
 				},
 			},
 		},
@@ -3667,6 +3662,6 @@ func TestRemoveConfigUnknowns(t *testing.T) {
 	removeConfigUnknowns(cfg)
 
 	if !reflect.DeepEqual(cfg, expect) {
-		t.Fatalf("\nexpected: %#v\ngot: %#v", expect, cfg)
+		t.Fatalf("\nexpected: %#v\ngot:      %#v", expect, cfg)
 	}
 }