mongodb - 流星过滤发布限制并跳过总计数

Question

给定一个过滤和分页的流星出版物，我如何获得应用过滤后的总计数？

客户代码：

import { Meteor } from 'meteor/meteor';
import { Template } from 'meteor/templating';
import { Track } from 'meteor/tracker';

import { Posts } from '/imports/api/posts/posts.js';

import './posts.html';

Template.App_posts.onCreated(function() {
  this.subscribe('posts.all', new Date(), 0);

  Tracker.autorun(() => {
    let postCount = Posts.find({}).count();
    console.log(postCount); // 10
  });
});

服务器代码：

import { Meteor } from 'meteor/meteor';
import { check } from 'meteor/check';

import { Posts } from '../posts.js';

const postsPerPage = 10;

Meteor.publish('posts.all', function(date, page = 0) {
  if (!Meteor.userId()) throw new Meteor.Error('Unauthorised');

  check(date, Date);
  check(page, Number);

  let query = {
    userId: Meteor.userId()
  };

  let options = {};

  if (date) {
    query.createdAt = date;
  }

  options.limit = postsPerPage;
  options.skip = page * postsPerPage;

  let cursor = Posts.find(query, options);

  console.log(cursor.count()); // 100

  return cursor;
});

这将返回给定日期和页面的预期帖子，但问题是知道总过滤计数。

假设有 1000 个帖子，其中 100 个适用于此日期和用户。当一次只返回 10 个时，如何获得 100 个计数？

Answer 1

我认为你应该使用 tmeasday:publish-counts https://github.com/percolatestudio/publish-counts

在服务器上，您应该执行以下操作：

Meteor.publish('posts.numberOfPosts', function(date) {
   if (!this.userId){
       return this.ready();
   } 
   check(date, Date);

   let query = {
      userId: this.userId
   };
   if (date) {
     query.createdAt = date;
   }
   Counts.publish(this, 'all-posts', Posts.find(query));
}

在客户端： Counts.get('All-orders')

实际上，您也可以将此订阅放在“posts.all”中：

Meteor.publish('posts.all', function(date, page = 0) {
  if (!Meteor.userId()) throw new Meteor.Error('Unauthorised');

  check(date, Date);
  check(page, Number);

  let query = {
    userId: Meteor.userId()
  };

  let options = {};

  if (date) {
    query.createdAt = date;
  }

  options.limit = postsPerPage;
  options.skip = page * postsPerPage;

  let cursor = Posts.find(query, options);
  // https://github.com/percolatestudio/publish-counts#noready
  Counts.publish(this, 'all-posts', Posts.find(query), {noReady: true});

  return cursor;
});