Add HABTM support to joli

joliHABTM.js

//Joli is a lightweight js ORM built for Titanium Apps:
//https://github.com/xavierlacot/joli.js
//Add this to joli.query.prototype

/*
  Create HABTM query
  Assume standard relationship table naming standards
  Attempt to create local and foreign key from relationship table if none is declared
*/
fromThrough: function(table, relation_table, local_key, foreign_key, local_table, foreign_table) {
  this.data.from = table;
  
  var tables = relation_table.split("_");
  if(!local_key) {
    local_key = tables[0].substr(0, tables[0].length - 1)+'_id';
  }
  if(!foreign_key) {
    foreign_key = tables[1].substr(0, tables[1].length - 1)+'_id';
  }
  if(!local_table) {
    local_table = tables[0];
  }
  if(!foreign_table) {
    foreign_table = tables[1];
  }
  this.data.join.push([relation_table, relation_table+'.'+local_key, local_table+'.id']);
  this.data.join.push([foreign_table, foreign_table+'.id', relation_table+'.'+foreign_key]);
  return this;
}

/*
q = new joli.query()
  .select('articles.*')
  .fromThrough('tags', 'tags_articles')
  .where('tags.id = ?', tag_id);
*/