helper/schema: Allow Schema with TypeInt to accept string values from DefaultFunc(). (#841)

This brings the int field up to par with bool and float ones.

Fixes hashicorp/terraform-plugin-sdk#773

Author: rudo-thomas

helper/schema/schema.go

@@ -2245,8 +2245,19 @@ func (m schemaMap) validatePrimitive(
 		// decode a float as an integer.
 
 		// the config shims only use int for integral number values
+		// also accept a string, just as the TypeBool and TypeFloat cases do
 		if v, ok := raw.(int); ok {
 			decoded = v
+		} else if _, ok := raw.(string); ok {
+			var n int
+			if err := mapstructure.WeakDecode(raw, &n); err != nil {
+				return append(diags, diag.Diagnostic{
+					Severity:      diag.Error,
+					Summary:       err.Error(),
+					AttributePath: path,
+				})
+			}
+			decoded = n
 		} else {
 			return append(diags, diag.Diagnostic{
 				Severity:      diag.Error,
@@ -2255,7 +2266,7 @@ func (m schemaMap) validatePrimitive(
 			})
 		}
 	case TypeFloat:
-		// Verify that we can parse this as an int
+		// Verify that we can parse this as a float
 		var n float64
 		if err := mapstructure.WeakDecode(raw, &n); err != nil {
 			return append(diags, diag.Diagnostic{

helper/schema/schema_test.go

@@ -6744,6 +6744,33 @@ func TestSchemaMap_Validate(t *testing.T) {
 			},
 			Err: true,
 		},
+		"bool with DefaultFunc that returns str": {
+			Schema: map[string]*Schema{
+				"bool_field": {
+					Type:        TypeBool,
+					Optional:    true,
+					DefaultFunc: func() (interface{}, error) { return "true", nil },
+				},
+			},
+		},
+		"float with DefaultFunc that returns str": {
+			Schema: map[string]*Schema{
+				"float_field": {
+					Type:        TypeFloat,
+					Optional:    true,
+					DefaultFunc: func() (interface{}, error) { return "1.23", nil },
+				},
+			},
+		},
+		"int with DefaultFunc that returns str": {
+			Schema: map[string]*Schema{
+				"int_field": {
+					Type:        TypeInt,
+					Optional:    true,
+					DefaultFunc: func() (interface{}, error) { return "1", nil },
+				},
+			},
+		},
 	}
 
 	for tn, tc := range cases {