docs: function loadEntityAttribute(Entity, attribute) {
      expect(arguments).to.have.length(
        2,
        'Invalid arguments length when loading an entity attribute in a ' +
        'MongoAdapter (it has to be passed 2 arguments)'
      );
  
      expect(Entity).to.be.a(
        'function',
        'Invalid argument "Entity" when loading an entity in a ' +
        'MongoAdapter (it has to be an Entity class)'
      );
  
      expect(classes.isGeneral(entity.models.Entity, Entity)).to.be.equal(
        true,
        'Invalid argument "Entity" when loading an entity attribute in a ' +
        'MongoAdapter (it has to be an Entity class)'
      );
  
      expect(attribute).to.be.an.instanceOf(
        Attribute,
        'Invalid argument "attribute" when loading an entity attribute in a ' +
        'MongoAdapter (it has to be an Attribute instance)'
      );
  
      var dataName = attribute.getDataName(Entity.adapterName);
  
      expect(dataName).to.not.match(
        /^\$/,
        'The dataName of an Attribute cannot start with "$" in a MongoAdapter'
      );
  
      expect(dataName).to.not.contain(
        '.',
        'The dataName of an Attribute cannot contain "." in a MongoAdapter'
      );
  
      expect(dataName).to.not.contain(
        '\0',
        'The dataName of an Attribute cannot contain "\0" in a MongoAdapter'
      );
  
      expect(dataName).to.not.equal(
        'Entity',
        'The dataName of an Attribute cannot be equal to "Entity" in a ' +
        'MongoAdapter'
      );
  
      expect(dataName).to.not.equal(
        '_id',
        'The dataName of an Attribute cannot be equal to "_id" in a MongoAdapter'
      );
  
      expect(_collections).to.have.ownProperty(
        Entity.dataName,
        'Failed to load the attribute in an Entity called "' +
        Entity.specification.name + '" because the Entity was not loaded yet'
      );
  
      expect(_collections[Entity.dataName]).to.not.contain(
        dataName,
        'Failed to load the attribute "' + attribute.name + '" in an Entity ' +
        'called "' + Entity.specification.name + '" because it is not ' +
        'possible to have attributes of the same Entity with duplicated ' +
        'dataName in a MongoAdapter'
      );
  
      _collections[Entity.dataName].push(dataName);
    }