Why is my Eloquent Relation not filling all of my objects?-CodePudding

I have a "types" table which contains only ID and Name, the relation works on the first object but returns null on the following objects. Here is what my JSON looks like:

{"id":1,"type_id":1,"name":"test1","enabled":1,"measurement_type":{"id":1,"name":"test"}},
{"id":2,"type_id":2,"name":"test2","enabled":0,"measurement_type":null}]},
{"id":3,"type_id":1,"name":"test3","enabled":1,"measurement_type":null}]}

Here are my relations:
MeasurementFields Model

    public function measurement_type() {
        return $this->belongsTo(MeasurementType::class, 'type_id');
    }

MeasurementTypes Model

    public function measurement_type() {
        return $this->belongsTo(MeasurementData::class); 
    }

In this Model I already have a measurement_field function which declares a belongsTo to MeasurementData (different Model) So, how do I name the new function with hasMany for types?

My Controller:

    public function index()
    {
        return JsonResource::collection(MeasurementField::with('measurement_type')->get());
    }

They all contain data, as you can see from the JSON, the relation just doesn't do anything with it.

My migrations:

        Schema::create('measurement_types', function (Blueprint $table) {
            $table->id()->autoincrement();
            $table->string('name');
        });

        Schema::create('measurement_fields', function (Blueprint $table) {
            $table->id()->autoincrement();
            $table->foreignId('type_id')->constrained('measurement_types');
            $table->string('name')->unique();
            $table->boolean('enabled');
        });

CodePudding user response：

I think your measurement_type has many measurement_field.

and I guess you have to put this in your MeasurementField Model:

public function measurement_type() {
        return $this->belongsTo(MeasurementType::class, 'type_id');
    }