Is it possible to filter a query by the attributes in the association table with sequelize?

Question

I am trying to filter my query by the attributes of the joining table

I have 2 tables Cities and Categories which I am associating through a third table CityCategory

Answer 1

When querying the through table, you should use through.where

include: [{
  model: Category,
  through: { where: {year: 2015}},
  attributes: ['id']
}]

You might want to add required: true to turn the include to an inner join

Answer 2

For Sequelize v3 it appears the syntax is closer to what you suggested, that is:

include: [{
  model: Category,
  where: {year: 2015},
  attributes: ['id']
}]