mongoose-pages
Version:
Developer-friendly pagination plugin for Mongoose ODM
84 lines (58 loc) • 2.08 kB
JavaScript
module.exports = function (conditions, fields, options, callback, limit, pageNumber) {
var model = this;
// re-assign params
if ('function' == typeof conditions) {
//console.log('A');
limit = fields;
pageNumber = options;
callback = conditions;
conditions = {};
fields = null;
options = {};
} else if ('function' == typeof fields) {
//console.log('B');
limit = options;
pageNumber = callback;
callback = fields;
fields = null;
options = {};
} else if ('function' == typeof options) {
//console.log('C');
pageNumber = limit;
limit = callback;
callback = options;
options = {};
}
if (pageNumber < 1) {
callback(new Error('Invalid Page Number'));
}
else if (!(typeof pageNumber == 'undefined') && isNaN(pageNumber)) {
callback(new Error('Invalid Page Number'));
}
else {
pageNumber = +pageNumber || 1;
// set pagination filters
if (pageNumber) options.skip = limit * (pageNumber - 1);
if (limit) options.limit = limit;
return model.find(conditions, fields, options, function (err, docs) {
var result = {}
if (docs && docs.length) {
result.documents = docs;
model.count(conditions, function (err, count) {
var totalDocs = count;
if (limit) result.totalPages = Math.ceil(totalDocs / limit);
else result.totalPages = 1;
if (result.totalPages > 1) {
if (pageNumber > 1) result.prevPage = pageNumber - 1;
if (pageNumber < result.totalPages) result.nextPage = pageNumber + 1;
}
callback(err, result);
})
} else {
result.documents = [];
result.totalPages = 0;
callback(err, result);
}
})
}
}