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var service = { mget: require('../service/mget') };
function setup( backend ){
// allow overriding of dependencies
backend = backend || require('../src/backend');
function controller( req, res, next ){
// do not run controller when a request
// validation error has occurred.
if( req.errors && req.errors.length ){
return next();
}
/* req.clean.ids contains an array of objects with id and types properties.
* types is an array of one or more types, since it can't always be known which single
* type a gid might belong to (osmnode and osmway both have source osm and layer venue).
*
* However, the mget Elasticsearch query only accepts a single type at a
* time.
*
* So, first create a new array that, has an entry
* with each type and id combination. This requires creating a new array with more entries
* than req.clean.ids in the case where entries have multiple types.
*/
var recordsToReturn = req.clean.ids.reduce(function (acc, ids_element) {
ids_element.types.forEach(function(type) {
acc.push({
id: ids_element.id,
type: type
});
});
return acc;
}, []);
/*
* Next, map the list of records to an Elasticsearch mget query
*/
var query = recordsToReturn.map( function(id) {
return {
_index: 'pelias',
_type: id.type,
_id: id.id
};
});
service.mget( backend, query, function( err, docs ) {
// error handler
if( err ){
req.errors.push( err );
}
// set response data
else {
res.data = docs;
}
next();
});
}
return controller;
}
module.exports = setup;