code: function (graph, opts, params) {
      var self = this;
      var updatedNodes = graph.allNodes;
      if (opts.restrictToComp) {
        updatedNodes = graph.allNodes.filter(function(node) {
          return node.comp && node.comp.name == opts.restrictToComp;
        });
      }
  
      function assign(statements, varName, hash) {
        params[varName] = hash;
        if (opts.additive) {
          _.forEach(hash, function(val, key) {
            statements.push(varName + '.`' + key + '`={' + varName + '}.`' + key + '`');
          });
        } else {
          statements.push(varName + '={' + varName + '}');
        }
      }
  
      return 'SET ' + updatedNodes.reduce(function(statements, node) {
        // set props
        var props = node.props;
        if (props[self.db.options.id]) props = _.omit(props, self.db.options.id);
        
        if (node.comp) assign(statements, '__rel_' + node.name, props._rel || {});
        
        props = _.omit(props, '_rel');
        assign(statements, node.name, props);
  
        // set timestamps
        if (!node.model.usingTimestamps) return statements;
        statements.push(getSetCreatedTimestampStatement(node));
        statements.push(node.name + '.' + node.model.updatedField + ' = timestamp()');
  
        return statements;
      }, []).join(',');
    }
docs: get the SET statement of a write query this will set the properties on all nodes