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+/* Taken from Tom Nurkkala's Youtube Video on Object-RElational Mapping, which uses KnexJS and ObjectionJS to demonstrate
+ Basic SQL relationships
+
+Models in relation
+    source: model containing relationMappings definition
+    related: model at other end of relation
+
+Relation        Attribute                   FK(s) in
+One-toMany      BelongsToOneRelation        Source
+                HasManyRelation             Related
+
+Many-to-Many    ManyToManyRelation          Source
+
+One-to-One      BelongsToOneRelation        Source
+                HasOneRelation              Related
+                HasOneThroughRelation       Join table
+
+See video at around 48:00 for further details.
+Also look up Database Relations and also ObjectionJS docs for further details on each one.
+*/
+
+// MANY TO ONE RELATION ////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////////////
+
+// Firstly we extend the ObjectionJS Model class so that we can reference both the Country and City classes/tables later
+
+class Country extends Model {
+  static get tableName() {
+    return "country";
+  }
+}
+
+class City extends Model {
+  static get tableName() {
+    return "city";
+  }
+  // Note that we are still in the City extends Model here, we simply grab the city table here reference the Country class so that we can link
+  // their primary keys as a BelongsToOneRelation relationship...
+
+  // Note that the country object returned here could have been called anything, it simply is an object that is returned which
+  // refers to the relation we are creating here.
+
+  static get relationMappings() {
+    return {
+      // return city.$relatedQuery("country") below refers to THIS.
+      country: {
+        relation: Model.BelongsToOneRelation, // Defines a Many-to-One relationship
+        modelClass: Country,
+        join: {
+          from: "city.country_id",
+          to: "country.country_id",
+        },
+      },
+    };
+  }
+}
+
+// Then within our server's GET() request, we can ask for that particular relation to be displayed to us:
+
+// Firstly we have the verbose version of a Many-to-one Lazy query, which is also an example of LAZY loading:
+
+City.query()
+  .where("city_id", 45)
+  .first() // just give us the first result
+  .then((city) => {
+    console.log(city); // return us the City Class object
+    return city.$relatedQuery("country"); // refers to the country object created above
+  })
+  // secondary .then() statement returns what is outputted from the to: relation
+  // note that it doesn't just return us the country.country_id, that is just the foreign key that BINDS it to other tables,
+  // we are referencing in this case, the WHOLE country table
+  .then((country) => console.log(country))
+  .catch((error) => console.log(error.message));
+
+// But this is loaded using a "Lazy" fashion and is still a little clunky, there is a better way...
+
+// This is an example of a Many-to-One (otherwise known as a BelongsToOneRelation) Eager query:
+
+City.query()
+  .withGraphFetched("country") // Load this relation first
+  .where("city_id", 45)
+  .first() // again, just the first result
+  .then((city) => console.log(city))
+  .catch((error) => console.log(error.message));
+
+// ONE TO MANY RELATION ////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////////////
+
+// Great!  withGraphFetched() does a lot of the work for us that id displayed above...
+// But what if we want to know the relation of the CITY to the COUNTRY instead,
+// This is what is known as a One-to-Many relation, and it can be defined like so:
+
+class City extends Model {
+  // class City references the table named "city"
+  static get tableName() {
+    return "city";
+  }
+}
+
+class Country extends Model {
+  static get tableName() {
+    return "country";
+  }
+  static get relationMappings() {
+    return {
+      // note that we named this relationship in plural, this is to help us understand what KIND of relationship we are creating (One-to-Many)
+      cities: {
+        relation: Model.HasManyRelation, // Defines a One-to-Many relation
+        modelClass: City,
+        join: {
+          from: "country.country_id",
+          to: "city.country_id",
+        },
+      },
+    };
+  }
+}
+
+// And here's what the query() looks like (LAZY loading version):
+
+Country.query()
+  .where("country_id", 17)
+  .first()
+  .then((country) => {
+    console.log(country);
+    return country.$relatedQuery("cities");
+  })
+  .then((cities) => console.log(cities))
+  .catch((error) => console.log(error.message));
+
+// This will return to us a single instance (because of first()) of our Country Class with an array returned from
+// our $relatedQuery() method.  Again it returns us an ARRAY of CLASS City instances.
+
+// And of course, we would probably want to do this using an EAGER loading version:
+
+Country.query()
+  .withGraphFetched("cities")
+  .where("country_id", 17)
+  .first()
+  .then((country) => console.log(country))
+  .catch((error) => console.log(error.message));
+
+
+// MANY TO MANY RELATION ///////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////////////
+
+//  Lastly let's look at a Many-to-Many Relationship (3 or more table join):
+
+// In this instance, Tom Nurkkala uses the example of a film/actor database, which uses an "Associative Table",
+// called film_actor, which basically ONLY has references to two other tables (two foreign keys), in this case
+// the film table and the actor table.
+
+class Actor extends Model {
+  static get tableName() {
+    return "actor";
+  }
+  fullName() {
+    return `${this.first_name} ${this.last_name}`;
+  }
+}
+
+class Film extends Model {
+  static get tableName() {
+    return "film";
+  }
+  static get relationMappings() {
+    return {
+      // again, note the plural syntax here, to help us understand what we expect to be returned
+      actors: {
+        relation: Model.ManyToManyRelation,
+        modelClass: Actor,
+        // Because there are 3 tables involved here, we have to express their relations
+        join: {
+          from: "film.film_id",
+          // References our "Associative Table", which again, has two FOREIGN keys, referenced below:
+          through: {
+            from: "film_actor.film_id", // references the film.film_id
+            to: "film_actor.actor_id", // references the actor.actor_id
+          },
+          to: "actor.actor_id",
+        },
+      },
+    };
+  }
+}
+
+// And once again, we can query() this relation in a LAZY Loading fashion:
+
+Film.query()
+  .select("film_id", "title")
+  .where("film_id", 17)
+  .first()
+  .then((film) => {
+    console.log("TITLE", film.title);
+    return film.$relatedQuery("actors");
+  })
+  // after the 'actors' relation query is fulfilled, the returned array of actors is looped through,
+  // and the fullName() method defined above is invoked, returning the actor's full name
+  .then((actors) =>
+    actors.forEach((actor) => console.log("ACTOR", actor.fullName()))
+  )
+  .catch((error) => console.log(error.message));
+
+// And yes, the better EAGER version:
+
+Film.query()
+  .select("film_id", "title")
+  .where("film_id", 17)
+  .withGraphFetched("actors")
+  .first()
+  // Note the different syntax here, it's because Objection withGraphFetched() in a Many-to-Many relation returns us
+  // a single CLASS instance (first()) where film has an ARRAY referring to the RELATION "actors"
+  // This was defined in our relationMappings() method above...
+  // so referencing that array is done slightly DIFFERENTLY
+  .then((film) => {
+    console.log("TITLE", film.title);
+    film.actors.forEach((actor) => console.log("ACTOR", actor.fullName()));
+  })
+  .catch((error) => console.log(error.message));