请评论一下如何在ReasonmL中解码GeoJson文件?我尝试在解码器中解码没有“字段纬度和经度”的坐标,但找不到任何信息来解析JSON文件中的字段坐标。
GeoJson文件
"features": [
{
"type": "Feature","geometry": {
"type": "Point","coordinates": [
131.469670264,33.3158712032
]
},"properties": {
"index": 0,"alias": "海地獄-別府市","name": "Umi-Jigoku","image_url": "https://s3-media1.fl.yelpcdn.com/bphoto/7T1aXG9Q3CAtEbwqFm3Nlw/o.jpg"
}
ReasonmL中的JsonDecoder(bs-json)
[@genType]
type properties = {
index: int,alias: string,name: string,image_url: string,geometry: coordinates,}
and coordinates = {
latitude: float,longitude: float,};
let places = "../json/alljapan.json";
module Decode = {
let coordinates = json =>
Json.Decode.{
latitude: json |> field("latitude",float),longitude: json |> field("longitude",};
let properties = json =>
Json.Decode.{
index: json |> field("index",int),alias: json |> field("alias",string),name: json |> field("name",image_url: json |> field("image_url",geometry: json |> field("geometry",coordinates),};
};
let line = places |> Json.parseOrRaise |> Decode.line;