Laravel: Advanced Polymorphic relationship - laravel

Question

I am attempting to scope an answer to a User or Project via a polymorphic relationship via multiple levels but I am having some trouble getting my head around it.
It's tricky to explain, but I will show you what I have at the moment, minus the Answer model/relationship.
I have a Category and a Role model. These are in a belongsTo relationship (a role belongs to a category).
I also have a Question model, this also has a belongsTo relationship with a Role (a question belongs to a role).
I have created a roleables polymorphic relationship, allowing me to assign roles to either a User or a Project.
All of this is working as expected. I am able to return the assigned roles via my endpoint user/1/roles or project/1/roles, and in this endpoint, I am able to return the questions for that role (see example output below).
{
"data": [
{
"id": 20,
"name": "Actor",
"entity_id": 1,
"category_id": 3,
"questions": [
{
"id": 20,
"role_id": 20,
"field_type": "text",
"field_name": "Height",
"field_default_value": null,
"field_validation_rules": "required,string,max:5",
"field_options": false,
"order": 0
},
{
"id": 21,
"role_id": 20,
"field_type": "text",
"field_name": "Weight",
"field_default_value": null,
"field_validation_rules": "required,string,max:5",
"field_options": false,
"order": 1
},
{
"id": 22,
"role_id": 20,
"field_type": "select",
"field_name": "Race",
"field_default_value": null,
"field_validation_rules": "required,string,max:255",
"field_options": [
{
"id": "white",
"name": "White"
},
{
"id": "mixed",
"name": "Mixed"
}
],
"order": 2
},
{
"id": 23,
"role_id": 20,
"field_type": "select",
"field_name": "Gender",
"field_default_value": null,
"field_validation_rules": "required,string,max:255",
"field_options": [
{
"id": "male",
"name": "Male"
},
{
"id": "female",
"name": "Female"
},
{
"id": "other",
"name": "Other"
}
],
"order": 3
}
],
"created_at": {
"date": "2019-07-24 13:35:33.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"updated_at": {
"date": "2019-07-24 13:35:33.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"entity_type": "user"
},
{
"id": 23,
"name": "Singer",
"entity_id": 1,
"category_id": 3,
"questions": [
{
"id": 26,
"role_id": 23,
"field_type": "text",
"field_name": "Description",
"field_default_value": null,
"field_validation_rules": "required,string,max:255",
"field_options": false,
"order": 0
}
],
"created_at": {
"date": "2019-07-24 13:35:33.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"updated_at": {
"date": "2019-07-24 13:35:33.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"entity_type": "user"
},
{
"id": 32,
"name": "Console Operator",
"entity_id": 1,
"category_id": 5,
"questions": [
{
"id": 35,
"role_id": 32,
"field_type": "text",
"field_name": "Description",
"field_default_value": null,
"field_validation_rules": "required,string,max:255",
"field_options": false,
"order": 0
}
],
"created_at": {
"date": "2019-07-24 13:35:33.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"updated_at": {
"date": "2019-07-24 13:35:33.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"entity_type": "user"
},
{
"id": 60,
"name": "Composer",
"entity_id": 1,
"category_id": 7,
"questions": [
{
"id": 63,
"role_id": 60,
"field_type": "text",
"field_name": "Description",
"field_default_value": null,
"field_validation_rules": "required,string,max:255",
"field_options": false,
"order": 0
}
],
"created_at": {
"date": "2019-07-24 13:35:33.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"updated_at": {
"date": "2019-07-24 13:35:33.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"entity_type": "user"
}
]
}
The problem that I am trying to get my head around is Answers to the questions. Just a little background, which may help me explain this in writing:
In the front-end, I have a page in which the user can update their information, on this page they also have the ability to assign themselves some roles. When the click on a role the list of questions is displayed and they have the ability to answer them.
The same is also true for a Project. A user can create projects, and have the ability to assigned roles and answer the relevant questions.
So, I guess I will need to create a new table in the database to store the answers.
The question is how/what relationship should this new answers table have to the question, user/project in order to get all the roles, questions and any answers scoped to the entity (user/project) and it's roles?
I would love the each role in the output from my user/1/roleendpoint to look more like the following (notice the new answers key in questions):
{
"id": 60,
"name": "Composer",
"entity_id": 1,
"category_id": 7,
"questions": [
{
"id": 63,
"role_id": 60,
"field_type": "text",
"field_name": "Description",
"field_default_value": null,
"field_validation_rules": "required,string,max:255",
"field_options": false,
"order": 0,
"answers": { ... }
}
],
"created_at": {
"date": "2019-07-24 13:35:33.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"updated_at": {
"date": "2019-07-24 13:35:33.000000",
"timezone_type": 3,
"timezone": "UTC"
},
"entity_type": "user"
}