bookshelf.js count method

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星月不相逢 2021-02-14 01:20

I was searching high and low to find how to do basic counting (like SELECT COUNT(something) FROM table) with Bookshelf.js, but to no avail. Is there anything I\'m missing? Or is

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  • 2021-02-14 01:42

    For now it's a manual query... e.g:

    bookshelf.knex(tableName).count('columnName').then(...
    

    Long story as to why that's the case, but it's mainly because of a few complexities around counts in relations, I don't want to hack a half working one on there just for the sake of having it there for the time being... the ultimate solution is going to be to have:

    model.query().count(column).then(...
    

    But currently that mutates the knex query builder instance, so doesn't quite work. I've been working on a big refactor of knex and I'm looking to get this implemented in the near future.

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  • 2021-02-14 01:45
    User.collection().query(function (qb) {
      qb.join('courses', 'users.id', 'courses.user_id');
      qb.groupBy('users.id');
      qb.select("users.*");
      qb.count('* as course_count');
      qb.orderBy("course_count", "desc");
    })
    
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  • 2021-02-14 01:53
    //user.js
    var db = require('./db');
    var User = db.Model.extend({  
      tableName: 'users',
      hasTimestamps: true,
    });
    module.exports = User; 
    
    //main.js
    var User = require('./user');
    User.where('pet', 'dog').count('*').then(function(count) {
      console.log("Total Count : " , count);
    });
    

    In the above code snippet User is a model having the attributes like pet and name.

    The generated query will be as follows: select count(*) from user where pet='dog';

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  • 2021-02-14 01:55

    Here's the format that I'm currently using to do the following from a model:

    var Sample = bookshelf.Model.extend({
      tableName: 'example',
    
      count: function (cb) {
        bookshelf.knex('example')
          .count('id')
          .then(function (count) {
            cb(null, count)
          })
          .catch(function (err) {
            cb(err)
          })
      }
    })
    

    Now, to count this table, simply call

    new Sample().count(function(err, result) {
        console.log(result)
    });
    
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  • 2021-02-14 02:01

    Here is a really simple solution just use Bookshelf.knex.raw('count(id) as count')

    ReactionsDb
        .query(function(qb) {
          qb.groupBy('reaction_type');
        })
        .fetchAll({columns: ['reaction_type', Bookshelf.knex.raw('count(id) as count')]});
    
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  • 2021-02-14 02:03

    Since version 0.8.2 you can just use the Collection#count() method:

    User.collection().count().then(function(count) {
      // count === 15
    })
    

    This can be used on any collection, like a model's relation:

    User.forge({id: 1}).related('comments').count().then(function(count) {
      // count === 16
    })
    

    It can also be used on Model classes as a static method:

    User.count().then(function(count) {
      // count === 15
    })
    

    It also accepts a column name to filter the results of the count by excluding rows whose value is NULL and will take into consideration any other defined query constraints:

    User.count('is_active').then(function(count) {
      // count === 8
    })
    
    User.where('status', 'single').count().then(function(count) {
      // count === 4
    })
    
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