gistfile1.js

var mg = require('./../src/micrograph');
exports.inverseProperties = function(test) {
    mg.create(function(g) {
	// saving a Person
	g.save([{$type: 'Person',
		 name: 'Ludwig',
		 surname: 'Wittgenstein',
		 birthplace: 'Wien'}], 	       
	       function(wittgenstein){		   
		   // saving some books
		   g.save({$type: 'Book',
			   title: 'The Open Society and its Enemies',
			   // Popper is included as author here
			   author$in: {$type: 'Person',
				       name:'Karl',
				       surname: 'Popper'},
			   pages: 510}).
		       save({$type: 'Book',
			     title: 'Philosophical Investigations',
			     pages: 320,
			     author$in: wittgenstein.$id}).
		       save({$type: 'Book',
			     title: 'Tractatus Logico-Philosophicus',
			     pages: 120,
			     author$in: wittgenstein.$id}).
		       // all books written by something whose name is not Wittgenstein
		       where({$type: 'Book',
			      author$in: 
			      {surname: {$neq: 'Wittgenstein'}}}).
		       execute(function(books){
			   var titles = {};
			   for(var i=0; i<books.length; i++) {
			       titles[books[i].title] = true;
			   }
			   test.ok(titles["The Open Society and its Enemies"]);

			   titles = {};
			   // All books written by Wittgenstein
			   g.where({surname: 'Wittgenstein',
				    author: {}}).
			       each(function(wittgenstein){
				   for(var i=0; i<wittgenstein.author.length; i++)
				       titles[wittgenstein.author[i].title] = true;				   
			       }).
			       execute(function(){
				   test.ok(titles["Philosophical Investigations"]);
				   test.ok(titles["Tractatus Logico-Philosophicus"]);
				   test.done();
			       });
		       });
	       });
    });
};