title: Mongoose - this.find() does not exist
body: <p>within my model, I am trying to do a static getUserByToken method. However, if I do it like in the documentation, I am getting</p>
  
  <pre><code>this.find is not a function
  </code></pre>
  
  <p>My code looks like this:</p>
  
  <pre><code>'use strict';
  
  const mongoose = require('mongoose');
  const Schema = mongoose.Schema;
  
  const schema = new Schema({
      mail: {
          type: String,
          required: true,
          validate: {
              validator: (mail) =&gt; {
                  return /^[-a-z0-9~!$%^&amp;*_=+}{\'?]+(\.[-a-z0-9~!$%^&amp;*_=+}{\'?]+)*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_]+)*\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(:[0-9]{1,5})?$/i.test(mail);
              }
          }
      },
      birthDate: {
          type: Date,
          required: true,
          max: Date.now,
          min: new Date('1896-06-30')
      },
      password: {
          type: String,
          required: true
      },
      ...
  });
  
  
  schema.statics.getUserByToken = (token, cb) =&gt; {
      return this.find({ examplefield: token }, cb);
  };
  
  module.exports.Schema = schema;
  </code></pre>
  
  <p>I am guessing it is just a simple mistake, however, I can not compile the model and than add the static function to the schema/model as this is done through an init function at startup, that compiles all the models.</p>
  
  <p>Anybody can help me with that?</p>