Facebook Golang SDK: Get location information in a post.

facebook.go

//
// this code is only a sample to demostrate how to read "place" field in a post.
//

package main

import fb "github.com/huandu/facebook"

type Location struct {
    City string
    Country string
    Latitude float
    Longitude float
}

type Place struct {
    Name string
    Location *Location
}

type Post struct {
    Place *Place
}

func main() {
    // see sample_graph_data.json for response data structure.
    post, _ := fb.Get("XXXXXX/feed", fb.Params{
        "with": "location",
        "limit": 1,
        "access_token": "ABCDEFGHIJK..."
    })
    
    // get "city" directly.
    var city string
    post.DecodeField("place.location.city", &city)
    
    // use Post type to extract information.
    var post Post
    post.Decode(&post)
    
    // advanced trick: decode sub struct.
    var locationResult Result
    var location Location
    post.DecodeField("place.location", &locationResult)
    locationResult.Decode(&location)
    
    // ah yes, following code works fine too.
    var location2 Location
    post.DecodeField("place.location", &location2)
}

sample_graph_data.json

{
  "data": [
    {
      "id": "1111111_22222222222222222", 
      "from": {
        "id": "1111111", 
        "name": "XXXXXX"
      }, 
      "story": "XXXXXX was at Melt.", 
      "actions": [
        {
          "name": "Comment", 
          "link": "https://www.facebook.com/1111111/posts/333333333333333"
        }, 
        {
          "name": "Like", 
          "link": "https://www.facebook.com/1111111/posts/444444444444444"
        }
      ], 
      "privacy": {
        "value": ""
      }, 
      "place": {
        "id": "153040818058032", 
        "name": "Melt", 
        "location": {
          "city": "Cincinnati", 
          "country": "United States", 
          "latitude": 39.162578073792, 
          "longitude": -84.539759046744, 
          "state": "OH", 
          "street": "4165 Hamilton Avenue", 
          "zip": "45223"
        }
      }, 
      "type": "status", 
      "status_type": "mobile_status_update", 
      "application": {
        "name": "Facebook for Android", 
        "namespace": "fbandroid", 
        "id": "5555555555"
      }, 
      "created_time": "2014-03-09T01:03:22+0000", 
      "updated_time": "2014-03-09T01:13:16+0000", 
      "likes": {
        "data": [
        ], 
        "paging": {
          "cursors": {
            "after": "MTAwMDM0NjE4Nw==", 
            "before": "NTM1OTY1NDE2"
          }
        }
      }, 
      "comments": {
        "data": [
        ], 
        "paging": {
          "cursors": {
            "after": "MQ==", 
            "before": "MQ=="
          }
        }
      }
    }
  ], 
  "paging": {
    "next": "https://graph.facebook.com/v1.0/1111111/feed?limit=1&with=location&until=1394327001"
  }
}