schema-mapper-serializer
v0.4.2
Published
Base serializer for storage drivers
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schema-mapper-serializer
Base serializer class for storage drivers.
usage
To serialize one of the ColumnTypes, Override / implement the method name which is translated the following way: the method name starts with "serialize", then the type follows (first letter is capitalized) and [] is replaced with "Array". Some examples:
string becomes: serializeString(item, column)
string[] becomes: serializeStringArray(item, column)
point[] becomes: serializePointArray(item, column)
The PostgreSQL serializer implementation:
var knex = require('knex')({dialect: 'postgres'});
var st = require('knex-postgis')(knex);
import Serializer from 'schema-mapper-serializer';
class PostgresqlSerializer extends Serializer {
/**
* Serialize a point.
*
* @protected
* @param {string} value
*/
serializePoint(value, column) {
return this.serializeGeoJSON(value, column);
}
/**
* Serialize a point array.
*
* @protected
* @param {string} value
*/
serializePointArray(value, column) {
return this.serializeGeoJSON(value, column);
}
/**
* Serialize a linestring.
*
* @protected
* @param {string} value
*/
serializeLinestring(value, column) {
return this.serializeGeoJSON(value, column);
}
/**
* Serialize a linestring array.
*
* @protected
* @param {string} value
*/
serializeLinestringArray(value, column) {
return this.serializeGeoJSON(value, column);
}
/**
* Serialize a polygon.
*
* @protected
* @param {string} value
*/
serializePolygon(value, column) {
return this.serializeGeoJSON(value, column);
}
/**
* Serialize a polygon array.
*
* @protected
* @param {string} value
*/
serializePolygonArray(value, column) {
return this.serializeGeoJSON(value, column);
}
/**
* Serialize to geojson.
*
* @protected
* @param {string} value
*/
serializeGeoJSON(value, column) {
if ( ! value.crs) {
value.crs = {
type: 'name',
properties: {name: 'EPSG:' + (column.srid || 4326)}
};
}
return st.geomFromGeoJSON(value);
}
}