Allow json path to work in objects which are struct based interfaces

[tarunlalwani]

This fixes the problem where jsonpath.Get doesn't work if the root object is a struct instead of blank interface.

I wrote the below test that shows the issues and also the patch working

package main import ( "fmt" "github.com/PaesslerAG/jsonpath"	jsoniter "github.com/json-iterator/go"	jsonpathpatch "github.com/tarunlalwani/jsonpath" ) var json = jsoniter.ConfigCompatibleWithStandardLibrary type MasterData map[string]interface{} func main() { testJson := `{"name": "test", "values": [{"code":"A"}, {"code":"B"}]}` var d MasterData json.Unmarshal([]byte(testJson), &d) fmt.Println("%s", d) jsonFilter := `$..[?(@.code=="B")]` filter, _ := jsonpath.Get(jsonFilter, d) filterPatched, _ := jsonpathpatch.Get(jsonFilter, d) fmt.Println("Without Patch: %s", filter) fmt.Println("With Patch: %s", filterPatched) }

Output:

%s map[name:test values:[map[code:A] map[code:B]]] Without Patch: %s [] With Patch: %s [map[code:B]] 

[generikvault]

Hi tarunlalwani,

if you add a test case I can merge this. In your use case it is actually not necessary. You could simply cast d to an map:

filter, _ := jsonpath.Get(jsonFilter, map[string]interface{}(d))

That will do the trick and is faster since it doesn't require reflection.

I got a little confused with the title MasterData isn't a struct. It's just a custom type.