expected.json

expected.json

[  
   {  
      "name":"Ciencia",
      "parent_id":null,
      "id":7,
      "children":[  
         {  
            "name":"Psicología",
            "parent_id":7,
            "id":12,
            "children":[  

            ]
         },
         {  
            "name":"Geología",
            "parent_id":7,
            "id":11,
            "children":[  

            ]
         },
         {  
            "name":"Física",
            "parent_id":7,
            "id":10,
            "children":[  

            ]
         },
         {  
            "name":"Química",
            "parent_id":7,
            "id":9,
            "children":[  

            ]
         },
         {  
            "name":"Biología",
            "parent_id":7,
            "id":8,
            "children":[  
               {  
                  "name":"Botánica",
                  "parent_id":8,
                  "id":19,
                  "children":[  

                  ]
               },
               {  
                  "name":"Etología",
                  "parent_id":8,
                  "id":18,
                  "children":[  
                     {  
                        "name":"Animalitos",
                        "parent_id":18,
                        "id":20,
                        "children":[  

                        ]
                     }
                  ]
               }
            ]
         }
      ]
   }
]