Fix pointer validator acceptance for schema.Array

Closes #240

Author: Dragomir-Ivanov

schema/array.go

@@ -18,12 +18,7 @@ type Array struct {
 
 // Compile implements the ReferenceCompiler interface.
 func (v *Array) Compile(rc ReferenceChecker) (err error) {
-	if c, ok := v.Values.Validator.(Compiler); ok {
-		if err = c.Compile(rc); err != nil {
-			return
-		}
-	}
-	return
+	return v.Values.Compile(rc)
 }
 
 func (v Array) validateValues(values []interface{}, query bool) ([]interface{}, error) {

schema/array_test.go

@@ -19,7 +19,13 @@ func TestArrayValidatorCompile(t *testing.T) {
 			Name:             "Values.Validator=&String{Regexp:invalid}",
 			Compiler:         &schema.Array{Values: schema.Field{Validator: &schema.String{Regexp: "[invalid re"}}},
 			ReferenceChecker: fakeReferenceChecker{},
-			Error:            "invalid regexp: error parsing regexp: missing closing ]: `[invalid re`",
+			Error:            ": invalid regexp: error parsing regexp: missing closing ]: `[invalid re`",
+		},
+		{
+			Name:             "Values.Validator=String{}",
+			Compiler:         &schema.Array{Values: schema.Field{Validator: schema.String{}}},
+			ReferenceChecker: fakeReferenceChecker{},
+			Error:            ": not a schema.Validator pointer",
 		},
 	}
 	for i := range testCases {