Associations not working for Sequelize - node.js

Question

I run the below mutation first, creates the fish, I also created a river all ready. Why are rivers and fishes empty?
Graphql:
query {
fishes {
name
species
rivers {
name
}
}
river(id: 1) {
name
fishes {
name}
}
}
# mutation {
# createFish (name: "Orange-Vall Smallmouth Yellowfish", species: "Labeobarbus aeneus", riverId: 1) {
# name
# rivers {
# name
# }
# }
# }
The results are below:
{
"data": {
"fishes": [
{
"name": "Orange-Vall Smallmouth Yellowfish",
"species": "Labeobarbus aeneus",
"rivers": []
}
],
"river": {
"name": "Orange River",
"fishes": []
}
}
}
Below are the two models:
const Fish = sequelize.define('fish', schema);
Fish.associate = models => {
Fish.belongsToMany(models.River, { through: 'RiverFish' });
};
const River = sequelize.define('river', schema);
River.associate = models => {
River.belongsToMany(models.Fish, { through: 'RiverFish', as: 'Fishes' });
};
Part of the graphql query:
River: {
fishes: river => river.getFishes(), },
Fish: {
rivers: fish => fish.getRivers(), },
Sequelize logs:
Executing (default): CREATE TABLE IF NOT EXISTS `fishes` (`id` INTEGER PRIMARY KEY AUTOINCREMENT, `name` VARCHAR(255), `species` VARCHAR(255) DEFAULT NULL, `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL);
Connection has been established successfully.
Executing (default): PRAGMA INDEX_LIST(`fishes`)
Executing (default): CREATE TABLE IF NOT EXISTS `rivers` (`id` INTEGER PRIMARY KEY AUTOINCREMENT, `name` VARCHAR(255), `alternative` VARCHAR(255) DEFAULT NULL, `geojson` JSON, `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL);
Executing (default): PRAGMA INDEX_LIST(`rivers`)
Executing (default): CREATE TABLE IF NOT EXISTS `RiverFish` (`createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL, `fishId` INTEGER NOT NULL REFERENCES `fishes` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, `riverId` INTEGER NOT NULL REFERENCES `rivers` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, PRIMARY KEY (`fishId`, `riverId`));
Executing (default): PRAGMA INDEX_LIST(`RiverFish`)
Executing (default): PRAGMA INDEX_INFO(`sqlite_autoindex_RiverFish_1`)
EDIT
If I change my models the results are working from the River side of things:
River.hasMany(models.Fish, { as: 'Fishes' });
Fish.belongsToMany(models.River, { through: 'RiverFish', as: 'Rivers' });
{
"data": {
"fishes": [
{
"id": "1",
"name": "Orange-Vall Smallmouth Yellowfish",
"species": "Labeobarbus aeneus",
"rivers": []
}
],
"river": {
"name": "Orange River",
"fishes": [
{
"name": "Orange-Vall Smallmouth Yellowfish"
}
]
},
"rivers": null
}
UPDATE
I believe this could be the issue. I have this in a my models directory:
import Fish from './Fish';
import River from "./River";
const models = {
Fish,
River
};
Object.keys(models).forEach(name => {
const model = models[name];
if (typeof model.associate === 'function') {
model.associate(models);
}
});
export {
Fish, River,
};