Exploring nested relationships in Sequelize

My development stack involves Sequelize, Node.js, and MySQL.

The model structure I'm working with looks something like this:

// defining models:
var Group, Issue, Invite;

// establishing relationships: many Issues per Group
Group.hasMany(Issue);
Issue.belongsTo(Group);

// Groups can invite other Groups to collaborate on their Issues
Issue.hasMany(Invite, {foreignKey: groupId});
Invite.belongsTo(Issue, {foreignKey: groupId});
Group.hasMany(Invite, {foreignKey: inviteeId});
Invite.belongsTo(Group, {foreignKey: inviteeId});

// need to fetch all Invites + invited Groups (inviteeId) for a given Issue id - But how?
var query = {
    where: {id: ...}, 
    include: ???
};
Issue.find(query).complete(function(err, issue) {
    var invites = issue.invites;
    var firstInvitedGroup = issue.invites[0].group;
    // ...
});

I'm unsure if achieving this is feasible. Are there any potential solutions or workarounds you could suggest? Appreciate the help!

javascriptmysqlsequelize.js

Answer №1

Check out the Sequelize Documentation on Nested Eager Loading

Here is an example:

Issue.find({
    include: [
        {
            model: Invite,
            include: [Group]
        }
    ]
});

Answer №2

If you're looking to efficiently load all related associations, this handy function will do the trick.

Issue.find({
    include:getRelatedAssociations(Issue)
});



//Function to recursively load all related associations
function getRelatedAssociations(_model) {
  const associations = [];
  for (const association of Object.keys(_model.associations)) {
    const model = _model.associations[association].target;
    const as = association;
    const include = getRelatedAssociations(model);
    associations.push({
      model: model,
      as: as,
      ...(include && { include: include }),
    });
  }
  return associations;
}

Answer №3

When all hope seemed lost, I decided to take a chance and try one random shot, and it actually worked. Simply send attributes with an empty array, and it will not be included in the results

{
    model: User,
    as: 'users',
    attributes: [],  // This is the key// 
    where: {
      user_id: 1
    }
  }

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