Azure移动服务Node.js上where子句的筛选器功能

Question

I'm trying to use a filter function on a table object in the where clause described in the link before, but I can't find any reference about how to write it.

     exports.post = function(request, response) {
       var currentdate = (new Date()).getTime();
       takenOffersTable.where(function(request,currentdate){
       return (this.user_id ==  request.user.userId && this.offer_id == request.body.offer_id && this.__updatedAt < currentdate)
       }).read({ success: function(result) { ...

but in this way, I get Error: Expected value(s) for parameter(s) request,currentdate

and if I write it this way:

   exports.post = function() {
       var currentdate = (new Date()).getTime();
       takenOffersTable.where(function(request,currentdate){
       return (this.user_id ==  request.user.userId && this.offer_id == request.body.offer_id && this.__updatedAt < currentdate)
       }).read({ success: function(result) { ...

I get ReferenceError: request is not defined

How can I give the request and currentdate parameters to the filter function, or how do I write this? This didn't help either.

Answer 1

When using where(function) of table object , we should add the value of the parameter following the function(){} construct in the where closure.

Generate as the format like:

var variable1,variable2;
...
tableObject.where(function(parameter1,parameter2,...){},variable1,variable2,...)
...

And it seems that it will raise the TypeError: Converting circular structure to JSON issue if directly set request object in the where function.

So according your code, you can try to modify it as the following code snippet:

exports.post = function(request, response) {
       var currentdate = (new Date()).getTime();
       takenOffersTable.where(function(user,body,currentdate){
       return (this.user_id ==  user.userId && this.offer_id == body.offer_id && this.__updatedAt < currentdate)
       },request.user,request.body,currentdate).read({ success: function(result) { ...