Property does not exist on this Collection instance

Question

From what I’ve researched, it could be something related to the fact that you’re in a relationship 1:N, hasMany > belongsTo, but I don’t know what I have to do.

I’m developing a API in Laravel 5.5 and I have tables that relate when the relationship is 1:1, results normally, however, when I have tables that the relationship is 1:N, gives the message: Property does not exist on this collection instance.

Information:

The table of users [login_users] relates to the behavior table [behaviors], 1:N and in the [behaviors] only has the id.

And the behavior chart [behaviors] relates to the behavior key word table [lkp_key_behaviors], 1:1 and in the [lkp_key_behaviors], has the words of behavior as: Leadership, Organization, etc

When I change my relationship to 1:1, hasOne > belongsTo das Models LoginUser and Behavior, brings the results, but naturally does not bring all behaviors, brings only the first.

Model: Loginuser

public function behaviors()
{
    return $this->hasMany('App\Models\Behavior','login_user_id');
}

Model: Behavior

public function loginuser()
{
    return $this->belongsTo('App\Models\LoginUser','login_user_id');
}

public function lkpkeybehavior()
{
    return $this->hasOne('App\Models\LkpKeyBehavior','key_behavior_id');
}

Model: Lkpkeybehavior

public function behaviors()
{
    return $this->belongsTo('App\Models\Behavior','key_behavior_id');
}

Controller: Loginusercontroller

public function show($id)
{
    $loginuser = $this->loginuser->find($id);
    $behavior = $loginuser->behaviors->lkpkeybehavior;
    $lkpkeybehavior = $behavior->lkpkeybehavior;
    return response()->json(['User Profile' => $loginuser]);                           
}