Sequelize query for filtering on a many-to-many relationship

Seeking assistance with Sequelize ORM in express.js, I have successfully implemented a many-to-many relationship between two tables.

To simplify my query, imagine the tables as Users, Books, and UserBooks where UserBooks contains UserId, BookId, and an extra column (let's call it NoOfTimesRead).

My goal is to achieve something like this:

user.getBooks({
  where: {
    "userBooks.NoOfTimesRead": 0
  }
});

When I use:

user.getBooks();

It works fine and returns all books, but I am struggling to figure out how to filter by the additional column on the joining table.

I hope this explanation is clear. Thank you for your help!

Answer №1

Utilizing Belongs-To-Many allows you to run queries based on related connections and choose specific attributes. For instance, employing findAll with through

User.findAll({
  include: [{
    model: Project,
      through: {
        attributes: ['createdAt', 'startedAt', 'finishedAt']
          where: {completed: true}
      }
   }] 
 });

Essentially, by utilizing the through parameter and include the associated relationship, you can access more features. Further details can be found here

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