How to create a relationship in laravel - php

Question

Am new to laravel, I have issues trying to connect this tables: plans,users and loans even after reading the docs,
I have a plans tables that have all my plans, then I have a users table and loans table, my loans table has a user_id and a plan_id, all I want is to pull the records for plans and the users in the loan model.
Loanplan.php
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Loanplan extends Model
{
//
protected $fillable = [
'title',
'amount',
'interest',
'repayment_month',
'status',
];
public function loan()
{
return $this->belongsTo('App\loan');
}
}
my loan model:
Loan.php
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Loan extends Model
{
protected $table = 'loans';
//
protected $fillable = [
'id',
'user_id',
'loanplan_id',
'payment_made',
'status',
];
public function user()
{
return $this->belongsTo('App\User');
}
public function loanplan()
{
return $this->belongsTo('App\Loanplan');
}
}
I want get all the loan plans and users table records with plan_id and user_id as foreign respectively respectively in my LoanController.

Answer 1

I think the problem is with the customization of the loans table name in the Loanplan model.
According with your descriptions you need the followings setup:
A User can access to one or many Loans
users 1---m plans
A Loan belongs to a Loanplan // here I'm using Loanplan because that is your model name.
loans 1---m plans
So, this means:
User.php
namespace App;
use Illuminate\Database\Eloquent\Model;
class User extends Model
{
protected $table = 'users';
//
protected $fillable = [
'id',
//
];
public function loans()
{
return $this->hasMany(Loan::class);
}
//
}
Loan.php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Loan extends Model
{
protected $table = 'loans';
//
protected $fillable = [
'id',
'user_id',
'loanplan_id',
//
];
public function user()
{
return $this->belongsTo(User::class);
}
public function plan()
{
// Notice that here I'm specifying the foreign key:
return $this->belongsTo(Loanplan::class);
}
//
}
Loanplan.php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Loanplan extends Model
{
protected $table = 'plans';
//
protected $fillable = [
'id',
//
];
public function loans()
{
return $this->hasMany(Loan::class);
}
//
}
So with this, you can access the information in your LoanController.php:
LoanController.php
public function myCoolMethod()
{
// get a user
$user = User::first();
// access his/her loans
$loans = user->loans;
//
// get a loan plan
$plan = Loanplan::first();
// access its loans
$loans = plan->loans;
//
}
I strongly suggest you to read the Laravel Documentation regarding relationships and also a course for database design. Have a good day mate.

Answer 2

Loanplan.php is missing the protected $table = "plans" variable
Same file,
public function loan()
{
return $this->belongsTo('App\loan');
}
the relationship should be hasOne or hasMany, not belongsTo.
Moreover, the name of the class should have Loan with capital L.
public function loan()
{
return $this->...('App\Loan');
}

Answer 3

First of all add protected $table = 'plans'; to your Loanplan model since the table name is 'plans'
Loanplan Model
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Loanplan extends Model
{
protected $table = 'plans';
protected $fillable = [
'title',
'amount',
'interest',
'repayment_month',
'status',
];
public function loan()
{
return $this->hasOne('App\loan'); // or hasMany
}
}
?>
Loan Model
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Loan extends Model
{
protected $table = 'loans';
//
protected $fillable = [
'id',
'user_id',
'loanplan_id',
'payment_made',
'status',
];
public function user()
{
return $this->belongsTo('App\User');
}
public function loanplan()
{
return $this->belongsTo('App\Loanplan');
}
}
?>
add this to the User Model
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class User extends Model
{
public function Loan()
{
return $this->hasOne('App\Loan'); // or hasMany
}
}
?>

Answer 4

First, you have to check if the model already querying from table that you created before. Laravel will automatically access table base on your class name.
Note that we did not tell Eloquent which table to use for our Flight model. By convention, the "snake case", plural name of the class will be used as the table name unless another name is explicitly specified. So, in this case, Eloquent will assume the Flight model stores records in the flights table.
You can read it from this documentation
Second, make sure you call the right class. From Loanplan.php in the loan() method it's not using uppercase for the first letter.
Third, try to state the foreign key and primary key. You can also check how to do it in the documentation.