Swift parsing JSON Arrays gives zero

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0
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JSON output

"inputs":"lat":"29.93","lon":"-95.61","system_capacity":"30.30","azimuth":"180","tilt":"40","array_type":"1","module_type":"1","losses":"10","errors":,"warnings":,"version":"1.0.1","ssc_info":"version":45,"build":"Linux 64 bit GNU/C++ Jul 7 2015 14:24:09","station_info":"lat":29.93000030517578,"lon":-95.62000274658203,"elev":41.0,"tz":-6.0,"location":"None","city":"","state":"Texas","solar_resource_file":"W9562N2993.csv","distance":964,"outputs":"ac_monthly":[3480.57373046875,3440.078369140625,3992.6513671875,3977.071533203125,4074.91357421875,3701.75,3897.655517578125,4248.00390625,4023.283447265625,4157.29931640625,3605.156005859375,3342.12890625],"poa_monthly":[139.791015625,140.18896484375,164.8218536376953,164.47149658203125,173.2971649169922,159.90576171875,169.84793090820312,186.20114135742188,173.14492797851562,176.2291717529297,148.28318786621094,136.62326049804688],"solrad_monthly":[4.509387493133545,5.006748676300049,5.316833972930908,5.4823832511901855,5.590230941772461,5.3301920890808105,5.4789652824401855,6.00648832321167,5.77149772644043,5.684812068939209,4.94277286529541,4.407201766967773],"dc_monthly":[3644.867919921875,3606.52001953125,4179.85107421875,4158.3193359375,4252.9140625,3865.03369140625,4069.092041015625,4432.62744140625,4198.369140625,4336.99609375,3767.055419921875,3490.091064453125],"ac_annual":45940.55859375,"solrad_annual":5.293959140777588,"capacity_factor":17.308107376098633"inputs":"lat":"29.93","lon":"-95.61","system_capacity":"30.30","azimuth":"180","tilt":"40","array_type":"1","module_type":"1","losses":"10","errors":,"warnings":,"version":"1.0.1","ssc_info":"version":45,"build":"Linux 64 bit GNU/C++ Jul 7 2015 14:24:09","station_info":"lat":29.93000030517578,"lon":-95.62000274658203,"elev":41.0,"tz":-6.0,"location":"None","city":"","state":"Texas","solar_resource_file":"W9562N2993.csv","distance":964,"outputs":"ac_monthly":[3480.57373046875,3440.078369140625,3992.6513671875,3977.071533203125,4074.91357421875,3701.75,3897.655517578125,4248.00390625,4023.283447265625,4157.29931640625,3605.156005859375,3342.12890625],"poa_monthly":[139.791015625,140.18896484375,164.8218536376953,164.47149658203125,173.2971649169922,159.90576171875,169.84793090820312,186.20114135742188,173.14492797851562,176.2291717529297,148.28318786621094,136.62326049804688],"solrad_monthly":[4.509387493133545,5.006748676300049,5.316833972930908,5.4823832511901855,5.590230941772461,5.3301920890808105,5.4789652824401855,6.00648832321167,5.77149772644043,5.684812068939209,4.94277286529541,4.407201766967773],"dc_monthly":[3644.867919921875,3606.52001953125,4179.85107421875,4158.3193359375,4252.9140625,3865.03369140625,4069.092041015625,4432.62744140625,4198.369140625,4336.99609375,3767.055419921875,3490.091064453125],"ac_annual":45940.55859375,"solrad_annual":5.293959140777588,"capacity_factor":17.308107376098633

I am using the following class.

class PVClass

 struct Top : Decodable 
 var Outputs: OutputsJSON?
 var Inputs: InputsJSON?
 enum CodingKeys : String, CodingKey 
 case Inputs = "inputs"
 case Outputs = "outputs"
 
 
 struct InputsJSON: Decodable 
 var lat: String?
 var lon: String?
 enum CodingKeys : String, CodingKey 
 case lat = "lat"
 case lon = "lon"
 
 

 struct OutputsJSON: Decodable 

 var dcMonthly: DC_MonthlyJSON?

 struct DC_MonthlyJSON: Decodable 
 var DC_Monthly: [String]?
 enum CodingKeys : String, CodingKey 
 case DC_Monthly = "dc_monthly"

I access the JSON. I can print the 'lat' variable value but dc_monthly array gives me 0. I know there are 12 elements in the array. Even if I print DC_Monthly.count the value is 0. How can I access the array elements?

let decoder = JSONDecoder()
 let jsonData = try decoder.decode(PVClass.Top.self, from: data!)
 print("Lat: ", jsonData.Inputs?.lat ?? "0")
 print("dc_monthly: ", jsonData.Outputs?.dcMonthly?.DC_Monthly ?? "0")

edited Nov 9 at 13:11

asked Nov 9 at 1:09

vrao

1602519

There's no dc_monthly key in the JSON you posted.
– rmaddy
Nov 9 at 5:21

Sorry my mistake. I have the complete JSON when I run my program but forgot to paste the full JSON. Now I have updated the post. Noticed that the array elements in dc-monthly are not named, so How do I parse the elements?
– vrao
Nov 9 at 13:15

add a comment |

up vote
0
down vote

favorite

JSON output

"inputs":"lat":"29.93","lon":"-95.61","system_capacity":"30.30","azimuth":"180","tilt":"40","array_type":"1","module_type":"1","losses":"10","errors":,"warnings":,"version":"1.0.1","ssc_info":"version":45,"build":"Linux 64 bit GNU/C++ Jul 7 2015 14:24:09","station_info":"lat":29.93000030517578,"lon":-95.62000274658203,"elev":41.0,"tz":-6.0,"location":"None","city":"","state":"Texas","solar_resource_file":"W9562N2993.csv","distance":964,"outputs":"ac_monthly":[3480.57373046875,3440.078369140625,3992.6513671875,3977.071533203125,4074.91357421875,3701.75,3897.655517578125,4248.00390625,4023.283447265625,4157.29931640625,3605.156005859375,3342.12890625],"poa_monthly":[139.791015625,140.18896484375,164.8218536376953,164.47149658203125,173.2971649169922,159.90576171875,169.84793090820312,186.20114135742188,173.14492797851562,176.2291717529297,148.28318786621094,136.62326049804688],"solrad_monthly":[4.509387493133545,5.006748676300049,5.316833972930908,5.4823832511901855,5.590230941772461,5.3301920890808105,5.4789652824401855,6.00648832321167,5.77149772644043,5.684812068939209,4.94277286529541,4.407201766967773],"dc_monthly":[3644.867919921875,3606.52001953125,4179.85107421875,4158.3193359375,4252.9140625,3865.03369140625,4069.092041015625,4432.62744140625,4198.369140625,4336.99609375,3767.055419921875,3490.091064453125],"ac_annual":45940.55859375,"solrad_annual":5.293959140777588,"capacity_factor":17.308107376098633"inputs":"lat":"29.93","lon":"-95.61","system_capacity":"30.30","azimuth":"180","tilt":"40","array_type":"1","module_type":"1","losses":"10","errors":,"warnings":,"version":"1.0.1","ssc_info":"version":45,"build":"Linux 64 bit GNU/C++ Jul 7 2015 14:24:09","station_info":"lat":29.93000030517578,"lon":-95.62000274658203,"elev":41.0,"tz":-6.0,"location":"None","city":"","state":"Texas","solar_resource_file":"W9562N2993.csv","distance":964,"outputs":"ac_monthly":[3480.57373046875,3440.078369140625,3992.6513671875,3977.071533203125,4074.91357421875,3701.75,3897.655517578125,4248.00390625,4023.283447265625,4157.29931640625,3605.156005859375,3342.12890625],"poa_monthly":[139.791015625,140.18896484375,164.8218536376953,164.47149658203125,173.2971649169922,159.90576171875,169.84793090820312,186.20114135742188,173.14492797851562,176.2291717529297,148.28318786621094,136.62326049804688],"solrad_monthly":[4.509387493133545,5.006748676300049,5.316833972930908,5.4823832511901855,5.590230941772461,5.3301920890808105,5.4789652824401855,6.00648832321167,5.77149772644043,5.684812068939209,4.94277286529541,4.407201766967773],"dc_monthly":[3644.867919921875,3606.52001953125,4179.85107421875,4158.3193359375,4252.9140625,3865.03369140625,4069.092041015625,4432.62744140625,4198.369140625,4336.99609375,3767.055419921875,3490.091064453125],"ac_annual":45940.55859375,"solrad_annual":5.293959140777588,"capacity_factor":17.308107376098633

I am using the following class.

class PVClass

 struct Top : Decodable 
 var Outputs: OutputsJSON?
 var Inputs: InputsJSON?
 enum CodingKeys : String, CodingKey 
 case Inputs = "inputs"
 case Outputs = "outputs"
 
 
 struct InputsJSON: Decodable 
 var lat: String?
 var lon: String?
 enum CodingKeys : String, CodingKey 
 case lat = "lat"
 case lon = "lon"
 
 

 struct OutputsJSON: Decodable 

 var dcMonthly: DC_MonthlyJSON?

 struct DC_MonthlyJSON: Decodable 
 var DC_Monthly: [String]?
 enum CodingKeys : String, CodingKey 
 case DC_Monthly = "dc_monthly"

let decoder = JSONDecoder()
 let jsonData = try decoder.decode(PVClass.Top.self, from: data!)
 print("Lat: ", jsonData.Inputs?.lat ?? "0")
 print("dc_monthly: ", jsonData.Outputs?.dcMonthly?.DC_Monthly ?? "0")

edited Nov 9 at 13:11

asked Nov 9 at 1:09

vrao

1602519

There's no dc_monthly key in the JSON you posted.
– rmaddy
Nov 9 at 5:21

Sorry my mistake. I have the complete JSON when I run my program but forgot to paste the full JSON. Now I have updated the post. Noticed that the array elements in dc-monthly are not named, so How do I parse the elements?
– vrao
Nov 9 at 13:15

add a comment |

up vote
0
down vote

favorite

JSON output

"inputs":"lat":"29.93","lon":"-95.61","system_capacity":"30.30","azimuth":"180","tilt":"40","array_type":"1","module_type":"1","losses":"10","errors":,"warnings":,"version":"1.0.1","ssc_info":"version":45,"build":"Linux 64 bit GNU/C++ Jul 7 2015 14:24:09","station_info":"lat":29.93000030517578,"lon":-95.62000274658203,"elev":41.0,"tz":-6.0,"location":"None","city":"","state":"Texas","solar_resource_file":"W9562N2993.csv","distance":964,"outputs":"ac_monthly":[3480.57373046875,3440.078369140625,3992.6513671875,3977.071533203125,4074.91357421875,3701.75,3897.655517578125,4248.00390625,4023.283447265625,4157.29931640625,3605.156005859375,3342.12890625],"poa_monthly":[139.791015625,140.18896484375,164.8218536376953,164.47149658203125,173.2971649169922,159.90576171875,169.84793090820312,186.20114135742188,173.14492797851562,176.2291717529297,148.28318786621094,136.62326049804688],"solrad_monthly":[4.509387493133545,5.006748676300049,5.316833972930908,5.4823832511901855,5.590230941772461,5.3301920890808105,5.4789652824401855,6.00648832321167,5.77149772644043,5.684812068939209,4.94277286529541,4.407201766967773],"dc_monthly":[3644.867919921875,3606.52001953125,4179.85107421875,4158.3193359375,4252.9140625,3865.03369140625,4069.092041015625,4432.62744140625,4198.369140625,4336.99609375,3767.055419921875,3490.091064453125],"ac_annual":45940.55859375,"solrad_annual":5.293959140777588,"capacity_factor":17.308107376098633"inputs":"lat":"29.93","lon":"-95.61","system_capacity":"30.30","azimuth":"180","tilt":"40","array_type":"1","module_type":"1","losses":"10","errors":,"warnings":,"version":"1.0.1","ssc_info":"version":45,"build":"Linux 64 bit GNU/C++ Jul 7 2015 14:24:09","station_info":"lat":29.93000030517578,"lon":-95.62000274658203,"elev":41.0,"tz":-6.0,"location":"None","city":"","state":"Texas","solar_resource_file":"W9562N2993.csv","distance":964,"outputs":"ac_monthly":[3480.57373046875,3440.078369140625,3992.6513671875,3977.071533203125,4074.91357421875,3701.75,3897.655517578125,4248.00390625,4023.283447265625,4157.29931640625,3605.156005859375,3342.12890625],"poa_monthly":[139.791015625,140.18896484375,164.8218536376953,164.47149658203125,173.2971649169922,159.90576171875,169.84793090820312,186.20114135742188,173.14492797851562,176.2291717529297,148.28318786621094,136.62326049804688],"solrad_monthly":[4.509387493133545,5.006748676300049,5.316833972930908,5.4823832511901855,5.590230941772461,5.3301920890808105,5.4789652824401855,6.00648832321167,5.77149772644043,5.684812068939209,4.94277286529541,4.407201766967773],"dc_monthly":[3644.867919921875,3606.52001953125,4179.85107421875,4158.3193359375,4252.9140625,3865.03369140625,4069.092041015625,4432.62744140625,4198.369140625,4336.99609375,3767.055419921875,3490.091064453125],"ac_annual":45940.55859375,"solrad_annual":5.293959140777588,"capacity_factor":17.308107376098633

I am using the following class.

class PVClass

 struct Top : Decodable 
 var Outputs: OutputsJSON?
 var Inputs: InputsJSON?
 enum CodingKeys : String, CodingKey 
 case Inputs = "inputs"
 case Outputs = "outputs"
 
 
 struct InputsJSON: Decodable 
 var lat: String?
 var lon: String?
 enum CodingKeys : String, CodingKey 
 case lat = "lat"
 case lon = "lon"
 
 

 struct OutputsJSON: Decodable 

 var dcMonthly: DC_MonthlyJSON?

 struct DC_MonthlyJSON: Decodable 
 var DC_Monthly: [String]?
 enum CodingKeys : String, CodingKey 
 case DC_Monthly = "dc_monthly"

let decoder = JSONDecoder()
 let jsonData = try decoder.decode(PVClass.Top.self, from: data!)
 print("Lat: ", jsonData.Inputs?.lat ?? "0")
 print("dc_monthly: ", jsonData.Outputs?.dcMonthly?.DC_Monthly ?? "0")

edited Nov 9 at 13:11

asked Nov 9 at 1:09

vrao

1602519

JSON output

"inputs":"lat":"29.93","lon":"-95.61","system_capacity":"30.30","azimuth":"180","tilt":"40","array_type":"1","module_type":"1","losses":"10","errors":,"warnings":,"version":"1.0.1","ssc_info":"version":45,"build":"Linux 64 bit GNU/C++ Jul 7 2015 14:24:09","station_info":"lat":29.93000030517578,"lon":-95.62000274658203,"elev":41.0,"tz":-6.0,"location":"None","city":"","state":"Texas","solar_resource_file":"W9562N2993.csv","distance":964,"outputs":"ac_monthly":[3480.57373046875,3440.078369140625,3992.6513671875,3977.071533203125,4074.91357421875,3701.75,3897.655517578125,4248.00390625,4023.283447265625,4157.29931640625,3605.156005859375,3342.12890625],"poa_monthly":[139.791015625,140.18896484375,164.8218536376953,164.47149658203125,173.2971649169922,159.90576171875,169.84793090820312,186.20114135742188,173.14492797851562,176.2291717529297,148.28318786621094,136.62326049804688],"solrad_monthly":[4.509387493133545,5.006748676300049,5.316833972930908,5.4823832511901855,5.590230941772461,5.3301920890808105,5.4789652824401855,6.00648832321167,5.77149772644043,5.684812068939209,4.94277286529541,4.407201766967773],"dc_monthly":[3644.867919921875,3606.52001953125,4179.85107421875,4158.3193359375,4252.9140625,3865.03369140625,4069.092041015625,4432.62744140625,4198.369140625,4336.99609375,3767.055419921875,3490.091064453125],"ac_annual":45940.55859375,"solrad_annual":5.293959140777588,"capacity_factor":17.308107376098633"inputs":"lat":"29.93","lon":"-95.61","system_capacity":"30.30","azimuth":"180","tilt":"40","array_type":"1","module_type":"1","losses":"10","errors":,"warnings":,"version":"1.0.1","ssc_info":"version":45,"build":"Linux 64 bit GNU/C++ Jul 7 2015 14:24:09","station_info":"lat":29.93000030517578,"lon":-95.62000274658203,"elev":41.0,"tz":-6.0,"location":"None","city":"","state":"Texas","solar_resource_file":"W9562N2993.csv","distance":964,"outputs":"ac_monthly":[3480.57373046875,3440.078369140625,3992.6513671875,3977.071533203125,4074.91357421875,3701.75,3897.655517578125,4248.00390625,4023.283447265625,4157.29931640625,3605.156005859375,3342.12890625],"poa_monthly":[139.791015625,140.18896484375,164.8218536376953,164.47149658203125,173.2971649169922,159.90576171875,169.84793090820312,186.20114135742188,173.14492797851562,176.2291717529297,148.28318786621094,136.62326049804688],"solrad_monthly":[4.509387493133545,5.006748676300049,5.316833972930908,5.4823832511901855,5.590230941772461,5.3301920890808105,5.4789652824401855,6.00648832321167,5.77149772644043,5.684812068939209,4.94277286529541,4.407201766967773],"dc_monthly":[3644.867919921875,3606.52001953125,4179.85107421875,4158.3193359375,4252.9140625,3865.03369140625,4069.092041015625,4432.62744140625,4198.369140625,4336.99609375,3767.055419921875,3490.091064453125],"ac_annual":45940.55859375,"solrad_annual":5.293959140777588,"capacity_factor":17.308107376098633

I am using the following class.

class PVClass

 struct Top : Decodable 
 var Outputs: OutputsJSON?
 var Inputs: InputsJSON?
 enum CodingKeys : String, CodingKey 
 case Inputs = "inputs"
 case Outputs = "outputs"
 
 
 struct InputsJSON: Decodable 
 var lat: String?
 var lon: String?
 enum CodingKeys : String, CodingKey 
 case lat = "lat"
 case lon = "lon"
 
 

 struct OutputsJSON: Decodable 

 var dcMonthly: DC_MonthlyJSON?

 struct DC_MonthlyJSON: Decodable 
 var DC_Monthly: [String]?
 enum CodingKeys : String, CodingKey 
 case DC_Monthly = "dc_monthly"

let decoder = JSONDecoder()
 let jsonData = try decoder.decode(PVClass.Top.self, from: data!)
 print("Lat: ", jsonData.Inputs?.lat ?? "0")
 print("dc_monthly: ", jsonData.Outputs?.dcMonthly?.DC_Monthly ?? "0")

arrays json swift4

edited Nov 9 at 13:11

asked Nov 9 at 1:09

vrao

1602519

edited Nov 9 at 13:11

asked Nov 9 at 1:09

vrao

1602519

edited Nov 9 at 13:11

asked Nov 9 at 1:09

vrao

1602519

asked Nov 9 at 1:09

vrao

1602519

asked Nov 9 at 1:09

vrao

1602519

There's no dc_monthly key in the JSON you posted.
– rmaddy
Nov 9 at 5:21

Sorry my mistake. I have the complete JSON when I run my program but forgot to paste the full JSON. Now I have updated the post. Noticed that the array elements in dc-monthly are not named, so How do I parse the elements?
– vrao
Nov 9 at 13:15

add a comment |

There's no dc_monthly key in the JSON you posted.
– rmaddy
Nov 9 at 5:21

Sorry my mistake. I have the complete JSON when I run my program but forgot to paste the full JSON. Now I have updated the post. Noticed that the array elements in dc-monthly are not named, so How do I parse the elements?
– vrao
Nov 9 at 13:15

There's no dc_monthly key in the JSON you posted.
– rmaddy
Nov 9 at 5:21

Sorry my mistake. I have the complete JSON when I run my program but forgot to paste the full JSON. Now I have updated the post. Noticed that the array elements in dc-monthly are not named, so How do I parse the elements?
– vrao
Nov 9 at 13:15

add a comment |

1 Answer
1

active

oldest

votes

up vote
0
down vote

accepted

Your class definition does not match the structure of your JSON. Try this instead:

struct Top: Codable 
 let inputs: Inputs
 let outputs: Outputs


struct Inputs: Codable 
 let lat, lon: String


struct Outputs: Codable 
 let dcMonthly: [Double]

 enum CodingKeys: String, CodingKey 
 case dcMonthly = "dc_monthly"
 


do 
 let top = try JSONDecoder().decode(Top.self, from: data)
 print(top.outputs.dcMonthly.count) // 12
 catch 
 print(error)

edited Nov 9 at 15:05

answered Nov 9 at 14:34

Gereon

5,80941442

this works. thank you
– vrao
Nov 9 at 21:09

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
0
down vote

accepted

Your class definition does not match the structure of your JSON. Try this instead:

struct Top: Codable 
 let inputs: Inputs
 let outputs: Outputs


struct Inputs: Codable 
 let lat, lon: String


struct Outputs: Codable 
 let dcMonthly: [Double]

 enum CodingKeys: String, CodingKey 
 case dcMonthly = "dc_monthly"
 


do 
 let top = try JSONDecoder().decode(Top.self, from: data)
 print(top.outputs.dcMonthly.count) // 12
 catch 
 print(error)

edited Nov 9 at 15:05

answered Nov 9 at 14:34

Gereon

5,80941442

this works. thank you
– vrao
Nov 9 at 21:09

add a comment |

up vote
0
down vote

accepted

Your class definition does not match the structure of your JSON. Try this instead:

struct Top: Codable 
 let inputs: Inputs
 let outputs: Outputs


struct Inputs: Codable 
 let lat, lon: String


struct Outputs: Codable 
 let dcMonthly: [Double]

 enum CodingKeys: String, CodingKey 
 case dcMonthly = "dc_monthly"
 


do 
 let top = try JSONDecoder().decode(Top.self, from: data)
 print(top.outputs.dcMonthly.count) // 12
 catch 
 print(error)

edited Nov 9 at 15:05

answered Nov 9 at 14:34

Gereon

5,80941442

this works. thank you
– vrao
Nov 9 at 21:09

add a comment |

up vote
0
down vote

accepted

Your class definition does not match the structure of your JSON. Try this instead:

struct Top: Codable 
 let inputs: Inputs
 let outputs: Outputs


struct Inputs: Codable 
 let lat, lon: String


struct Outputs: Codable 
 let dcMonthly: [Double]

 enum CodingKeys: String, CodingKey 
 case dcMonthly = "dc_monthly"
 


do 
 let top = try JSONDecoder().decode(Top.self, from: data)
 print(top.outputs.dcMonthly.count) // 12
 catch 
 print(error)

edited Nov 9 at 15:05

answered Nov 9 at 14:34

Gereon

5,80941442

Your class definition does not match the structure of your JSON. Try this instead:

struct Top: Codable 
 let inputs: Inputs
 let outputs: Outputs


struct Inputs: Codable 
 let lat, lon: String


struct Outputs: Codable 
 let dcMonthly: [Double]

 enum CodingKeys: String, CodingKey 
 case dcMonthly = "dc_monthly"
 


do 
 let top = try JSONDecoder().decode(Top.self, from: data)
 print(top.outputs.dcMonthly.count) // 12
 catch 
 print(error)

edited Nov 9 at 15:05

answered Nov 9 at 14:34

Gereon

5,80941442

edited Nov 9 at 15:05

answered Nov 9 at 14:34

Gereon

5,80941442

answered Nov 9 at 14:34

Gereon

5,80941442

answered Nov 9 at 14:34

Gereon

5,80941442

this works. thank you
– vrao
Nov 9 at 21:09

add a comment |

this works. thank you
– vrao
Nov 9 at 21:09

this works. thank you
– vrao
Nov 9 at 21:09

add a comment |

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