sequelizebatch.coffee

batchFindAll = (model,where,cback,size=10)->
  model.count({where})
  .then (res)=>
    total = res
    [0..Math.floor(total/size)].reduce (curr,num)=>
      count = num*10
      curr.then => cback(where,count,size)
    ,Promise.resolve()

sequelizebatch.js

var batchFindAll = function(model,where,cback,size){
  var total = 0;
  var offset = 0;
  if(size==null) size=10;
  return model.count({where:where}).then(function(res){
    total = res;
    pages = [];
    for(var i=0;i<Math.ceil(total/size);i++){
      pages.push(i);
    }
    return pages.reduce (function(curr,num){
      var count = num*10;
      return curr.then(function(){ return cback(where,count,size);});
    },Promise.resolve());
  });
};