The Weather Model Class

1. Getting the API key

1. Create an account in OpenWeather and go to the API page.



2. Click subscribe for the Daily Forecast 16 days and get the API key.



3. Save the api key as a static const in a separated file.

class ApiKey {

  static const String OPEN_WEATHER_API = " < Your-API-Key > ";

}







2. Creating The Weather Model Class

1. Visit this link 5 day weather forecast

2. Remplace this field with your api key and test this link in your browser

api.openweathermap.org/data/2.5/forecast?q=london,DE&appid={API key}






3. We will use a very practical tool that transform the json model to a dart model.
   visit JSON to Dart.
   Paste the response and type OpenWeather in class name field.
   




4. Copy the result in a new file.

5. You will see some errors caused by a class name called List which is a keword in Dart, so we need to change it to Liste .
   Also change the double type to num.
   You can copy the result from here :




class OpenWeather {

  final String? cod;

  final int? message;

  final int? cnt;

  final List<Liste>? list;

  final City? city;

 

  OpenWeather({

    this.cod,

    this.message,

    this.cnt,

    this.list,

    this.city,

  });

 

  OpenWeather.fromJson(Map<String, dynamic> json)

      : cod = json['cod'] as String?,

        message = json['message'] as int?,

        cnt = json['cnt'] as int?,

        list = (json['list'] as List?)

            ?.map((dynamic e) => Liste.fromJson(e as Map<String, dynamic>))

            .toList(),

        city = (json['city'] as Map<String, dynamic>?) != null

            ? City.fromJson(json['city'] as Map<String, dynamic>)

            : null;

 

  Map<String, dynamic> toJson() => {

        'cod': cod,

        'message': message,

        'cnt': cnt,

        'list': list?.map((e) => e.toJson()).toList(),

        'city': city?.toJson()

      };

}

 

class Liste {

  final int? dt;

  final Main? main;

  final List<Weather>? weather;

  final Clouds? clouds;

  final Wind? wind;

  final int? visibility;

  final double? pop;

  final Rain? rain;

  final Sys? sys;

  final String? dtTxt;

 

  Liste({

    this.dt,

    this.main,

    this.weather,

    this.clouds,

    this.wind,

    this.visibility,

    this.pop,

    this.rain,

    this.sys,

    this.dtTxt,

  });

 

  Liste.fromJson(Map<String, dynamic> json)

      : dt = json['dt'] as int?,

        main = (json['main'] as Map<String, dynamic>?) != null

            ? Main.fromJson(json['main'] as Map<String, dynamic>)

            : null,

        weather = (json['weather'] as List?)

            ?.map((dynamic e) => Weather.fromJson(e as Map<String, dynamic>))

            .toList(),

        clouds = (json['clouds'] as Map<String, dynamic>?) != null

            ? Clouds.fromJson(json['clouds'] as Map<String, dynamic>)

            : null,

        wind = (json['wind'] as Map<String, dynamic>?) != null

            ? Wind.fromJson(json['wind'] as Map<String, dynamic>)

            : null,

        visibility = json['visibility'] as int?,

        pop = json['pop'] as double?,

        rain = (json['rain'] as Map<String, dynamic>?) != null

            ? Rain.fromJson(json['rain'] as Map<String, dynamic>)

            : null,

        sys = (json['sys'] as Map<String, dynamic>?) != null

            ? Sys.fromJson(json['sys'] as Map<String, dynamic>)

            : null,

        dtTxt = json['dt_txt'] as String?;

 

  Map<String, dynamic> toJson() => {

        'dt': dt,

        'main': main?.toJson(),

        'weather': weather?.map((e) => e.toJson()).toList(),

        'clouds': clouds?.toJson(),

        'wind': wind?.toJson(),

        'visibility': visibility,

        'pop': pop,

        'rain': rain?.toJson(),

        'sys': sys?.toJson(),

        'dt_txt': dtTxt

      };

}

 

class Main {

  final double? temp;

  final double? feelsLike;

  final double? tempMin;

  final double? tempMax;

  final int? pressure;

  final int? seaLevel;

  final int? grndLevel;

  final int? humidity;

  final double? tempKf;

 

  Main({

    this.temp,

    this.feelsLike,

    this.tempMin,

    this.tempMax,

    this.pressure,

    this.seaLevel,

    this.grndLevel,

    this.humidity,

    this.tempKf,

  });

 

  Main.fromJson(Map<String, dynamic> json)

      : temp = json['temp'] as double?,

        feelsLike = json['feels_like'] as double?,

        tempMin = json['temp_min'] as double?,

        tempMax = json['temp_max'] as double?,

        pressure = json['pressure'] as int?,

        seaLevel = json['sea_level'] as int?,

        grndLevel = json['grnd_level'] as int?,

        humidity = json['humidity'] as int?,

        tempKf = json['temp_kf'] as double?;

 

  Map<String, dynamic> toJson() => {

        'temp': temp,

        'feels_like': feelsLike,

        'temp_min': tempMin,

        'temp_max': tempMax,

        'pressure': pressure,

        'sea_level': seaLevel,

        'grnd_level': grndLevel,

        'humidity': humidity,

        'temp_kf': tempKf

      };

}

 

class Weather {

  final int? id;

  final String? main;

  final String? description;

  final String? icon;

 

  Weather({

    this.id,

    this.main,

    this.description,

    this.icon,

  });

 

  Weather.fromJson(Map<String, dynamic> json)

      : id = json['id'] as int?,

        main = json['main'] as String?,

        description = json['description'] as String?,

        icon = json['icon'] as String?;

 

  Map<String, dynamic> toJson() =>

      {'id': id, 'main': main, 'description': description, 'icon': icon};

}

 

class Clouds {

  final int? all;

 

  Clouds({

    this.all,

  });

 

  Clouds.fromJson(Map<String, dynamic> json) : all = json['all'] as int?;

 

  Map<String, dynamic> toJson() => {'all': all};

}

 

class Wind {

  final double? speed;

  final int? deg;

  final double? gust;

 

  Wind({

    this.speed,

    this.deg,

    this.gust,

  });

 

  Wind.fromJson(Map<String, dynamic> json)

      : speed = json['speed'] as double?,

        deg = json['deg'] as int?,

        gust = json['gust'] as double?;

 

  Map<String, dynamic> toJson() => {'speed': speed, 'deg': deg, 'gust': gust};

}

 

class Rain {

  final double? h;

 

  Rain({

    this.h,

  });

 

  Rain.fromJson(Map<String, dynamic> json) : h = json['3h'] as double?;

 

  Map<String, dynamic> toJson() => {'3h': h};

}

 

class Sys {

  final String? pod;

 

  Sys({

    this.pod,

  });

 

  Sys.fromJson(Map<String, dynamic> json) : pod = json['pod'] as String?;

 

  Map<String, dynamic> toJson() => {'pod': pod};

}

 

class City {

  final int? id;

  final String? name;

  final Coord? coord;

  final String? country;

  final int? population;

  final int? timezone;

  final int? sunrise;

  final int? sunset;

 

  City({

    this.id,

    this.name,

    this.coord,

    this.country,

    this.population,

    this.timezone,

    this.sunrise,

    this.sunset,

  });

 

  City.fromJson(Map<String, dynamic> json)

      : id = json['id'] as int?,

        name = json['name'] as String?,

        coord = (json['coord'] as Map<String, dynamic>?) != null

            ? Coord.fromJson(json['coord'] as Map<String, dynamic>)

            : null,

        country = json['country'] as String?,

        population = json['population'] as int?,

        timezone = json['timezone'] as int?,

        sunrise = json['sunrise'] as int?,

        sunset = json['sunset'] as int?;

 

  Map<String, dynamic> toJson() => {

        'id': id,

        'name': name,

        'coord': coord?.toJson(),

        'country': country,

        'population': population,

        'timezone': timezone,

        'sunrise': sunrise,

        'sunset': sunset

      };

}

 

class Coord {

  final double? lat;

  final double? lon;

 

  Coord({

    this.lat,

    this.lon,

  });

 

  Coord.fromJson(Map<String, dynamic> json)

      : lat = json['lat'] as double?,

        lon = json['lon'] as double?;

 

  Map<String, dynamic> toJson() => {'lat': lat, 'lon': lon};

}




Fields in API response

·       cod Internal parameter

·       message Internal parameter

·       cntA number of timestamps returned in the API response

·       list

o list.dt Time of data forecasted, unix, UTC

o list.main

§ list.main.temp Temperature. Unit Default: Kelvin, Metric: Celsius, Imperial: Fahrenheit.

§ list.main.feels_like This temperature parameter accounts for the human perception of weather. Unit Default: Kelvin, Metric: Celsius, Imperial: Fahrenheit.

§ list.main.temp_min Minimum temperature at the moment of calculation. This is minimal forecasted temperature (within large megalopolises and urban areas), use this parameter optionally. Unit Default: Kelvin, Metric: Celsius, Imperial: Fahrenheit.

§ list.main.temp_max Maximum temperature at the moment of calculation. This is maximal forecasted temperature (within large megalopolises and urban areas), use this parameter optionally. Unit Default: Kelvin, Metric: Celsius, Imperial: Fahrenheit.

§ list.main.pressure Atmospheric pressure on the sea level by default, hPa

§ list.main.sea_level Atmospheric pressure on the sea level, hPa

§ list.main.grnd_level Atmospheric pressure on the ground level, hPa

§ list.main.humidity Humidity, %

§ list.main.temp_kf Internal parameter

o list.weather

§ list.weather.id Weather condition id

§ list.weather.main Group of weather parameters (Rain, Snow, Extreme etc.)

§ list.weather.description Weather condition within the group. You can get the output in your language. Learn more.

§ list.weather.icon Weather icon id

o list.clouds

§ list.clouds.all Cloudiness, %

o list.wind

§ list.wind.speed Wind speed. Unit Default: meter/sec, Metric: meter/sec, Imperial: miles/hour.

§ list.wind.deg Wind direction, degrees (meteorological)

§ list.wind.gust Wind gust. Unit Default: meter/sec, Metric: meter/sec, Imperial: miles/hour

o list.visibility Average visibility, metres

o list.pop Probability of precipitation

o list.rain

§ list.rain.3h Rain volume for last 3 hours, mm

o list.snow

§ list.snow.3h Snow volume for last 3 hours

o list.sys

§ list.sys.pod Part of the day (n - night, d - day)

o list.dt_txt Time of data forecasted, ISO, UTC

·       city

o city.id City ID

o city.name City name

o city.coord

§ city.coord.lat City geo location, latitude

§ city.coord.lon City geo location, longitude

o city.country Country code (GB, JP etc.)

o city.timezone Shift in seconds from UTC