52 lines
1.1 KiB
JavaScript
52 lines
1.1 KiB
JavaScript
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var _ = require('underscore')
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var pg = require('./pg');
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function geojson() {}
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geojson.prototype = new pg('geojson');
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var p = geojson.prototype;
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p._contentType = "application/json; charset=utf-8";
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p.getQuery = function(sql, options) {
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var gn = options.gn;
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var dp = options.dp;
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return 'SELECT *, ST_AsGeoJSON(' + gn + ',' + dp + ') as the_geom FROM (' + sql + ') as foo';
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};
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p.transform = function(result, options, callback) {
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_toGeoJSON(result, options.gn, callback);
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};
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function _toGeoJSON(data, gn, callback){
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try {
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var out = {
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type: "FeatureCollection",
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features: []
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};
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_.each(data.rows, function(ele){
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var _geojson = {
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type: "Feature",
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properties: { },
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geometry: { }
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};
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_geojson.geometry = JSON.parse(ele[gn]);
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delete ele[gn];
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delete ele["the_geom_webmercator"]; // TODO: use skipfields
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_geojson.properties = ele;
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out.features.push(_geojson);
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});
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// return payload
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callback(null, out);
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} catch (err) {
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callback(err,null);
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}
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}
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module.exports = geojson;
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module.exports.toGeoJSON = _toGeoJSON
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