text: /**
   * Module dependencies
   */
  var redis = require('redis');
  
  exports.initialize = function initializeSchema(schema, callback) {
      schema.client = redis.createClient(
          schema.settings.port,
          schema.settings.host,
          schema.settings.options
      );
  
      schema.client.auth(schema.settings.password, callback);
  
      schema.adapter = new BridgeToRedis(schema.client);
  };
  
  function BridgeToRedis(client) {
      this._models = {};
      this.client = client;
      this.indexes = {};
  }
  
  BridgeToRedis.prototype.define = function (descr) {
      var m = descr.model.modelName;
      this._models[m] = descr;
      this.indexes[m] = {};
      Object.keys(descr.properties).forEach(function (prop) {
          if (descr.properties[prop].index) {
              this.indexes[m][prop] = descr.properties[prop].type;
          }
      }.bind(this));
  };
  
  BridgeToRedis.prototype.defineForeignKey = function (model, key, cb) {
      this.indexes[model][key] = Number;
      cb(null, Number);
  };
  
  BridgeToRedis.prototype.save = function (model, data, callback) {
      this.client.hmset(model + ':' + data.id, data, function (err) {
          if (err) return callback(err);
          this.updateIndexes(model, data, callback);
      }.bind(this));
  };
  
  BridgeToRedis.prototype.updateIndexes = function (model, data, callback) {
      var i = this.indexes[model];
      var schedule = [];
      Object.keys(data).forEach(function (key) {
          if (i[key]) {
              schedule.push([
                  'sadd',
                  'i:' + model + ':' + key + ':' + data[key],
                  model + ':' + data.id
              ]);
          }
      }.bind(this));
  
      if (schedule.length) {
          this.client.multi(schedule).exec(function (err) {
              callback(err);
          });
      } else {
          callback(null);
      }
  };
  
  BridgeToRedis.prototype.create = function (model, data, callback) {
      this.client.incr('id:' + model, function (err, id) {
          data.id = id;
          this.save(model, data, function (err) {
              if (callback) {
                  callback(err, id);
              }
          });
      }.bind(this));
  };
  
  BridgeToRedis.prototype.exists = function (model, id, callback) {
      this.client.exists(model + ':' + id, function (err, exists) {
          if (callback) {
              callback(err, exists);
          }
      });
  };
  
  BridgeToRedis.prototype.find = function find(model, id, callback) {
      this.client.hgetall(model + ':' + id, function (err, data) {
          if (data && data.id) {
              data.id = id;
          } else {
              data = null;
          }
          callback(err, data);
      });
  };
  
  BridgeToRedis.prototype.destroy = function destroy(model, id, callback) {
      this.client.del(model + ':' + id, function (err) {
          callback(err);
      });
  };
  
  BridgeToRedis.prototype.possibleIndexes = function (model, filter) {
      if (!filter || Object.keys(filter).length === 0) return false;
  
      var foundIndex = [];
      Object.keys(filter).forEach(function (key) {
          if (this.indexes[model][key]) {
              foundIndex.push('i:' + model + ':' + key + ':' + filter[key]);
          }
      }.bind(this));
  
      return foundIndex;
  };
  
  BridgeToRedis.prototype.all = function all(model, filter, callback) {
      var ts = Date.now();
      var client = this.client;
  
      var indexes = this.possibleIndexes(model, filter);
      if (indexes.length) {
          indexes.push(handleKeys);
          client.sinter.apply(client, indexes);
      } else {
          client.keys(model + ':*', handleKeys);
      }
  
      function handleKeys(err, keys) {
          if (err) {
              return callback(err, []);
          }
          var query = keys.map(function (key) {
              return ['hgetall', key];
          });
          client.multi(query).exec(function (err, replies) {
              // console.log('Redis time: %dms', Date.now() - ts);
              callback(err, filter ? replies.filter(applyFilter(filter)) : replies);
          });
      }
  };
  
  function applyFilter(filter) {
      if (typeof filter === 'function') {
          return filter;
      }
      var keys = Object.keys(filter);
      return function (obj) {
          var pass = true;
          keys.forEach(function (key) {
              if (!test(filter[key], obj[key])) {
                  pass = false;
              }
          });
          return pass;
      }
  
      function test(example, value) {
          if (typeof value === 'string' && example && example.constructor.name === 'RegExp') {
              return value.match(example);
          }
          // not strict equality
          return example == value;
      }
  }
  
  BridgeToRedis.prototype.destroyAll = function destroyAll(model, callback) {
      this.client.keys(model + ':*', function (err, keys) {
          if (err) {
              return callback(err, []);
          }
          var query = keys.map(function (key) {
              return ['del', key];
          });
          this.client.multi(query).exec(function (err, replies) {
              callback(err);
          });
      }.bind(this));
  };
  
  BridgeToRedis.prototype.count = function count(model, callback) {
      this.client.keys(model + ':*', function (err, keys) {
          callback(err, err ? null : keys.length);
      });
  };
  
  BridgeToRedis.prototype.updateAttributes = function updateAttrs(model, id, data, cb) {
      this.client.hmset(model + ':' + id, data, cb);
  };
  
  