Laravel-8 one-many/many-one relationship - php

Question

I'm trying to display category for each entry's page, but they all only display 'JavaScript.'
(A category can have many entries, but each entry has exactly one category.)
My Category model:
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Category extends Model
{
protected $table = 'categories';
protected $fillable = [
'name'
];
public function entries() {
return $this->hasMany(Entry::class);
}
}
My Entry model:
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Entry extends Model
{
protected $table = 'entries';
protected $fillable = [
'title',
'hours',
'minutes',
'category_id',
'difficulty',
'url'
];
public function categories() {
return $this->belongsTo(Category::class, 'category_id');
}
public function getCreatedAtAttribute($value)
{
return date('F d, Y H:i', strtotime($value));
}
}
My EntryController's show() method:
/**
* Display the specified resource.
*
* #param Entry $entry
* #return \Illuminate\Http\Response
*/
public function show(Entry $entry)
{
$category = Entry::find($entry->category_id)->categories()->first();
return view( 'entries.show', compact( 'entry', 'category' ) );
}
My categories table's up() method:
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::create('categories', function (Blueprint $table) {
$table->id();
$table->string('name', 255);
});
}
My entries table's up() method:
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::create('entries', function (Blueprint $table) {
$table->id();
$table->string('title', 255);
$table->timestamps();
$table->integer('hours');
$table->integer('minutes');
$table->foreignId('category_id')->constrained('categories');
$table->string('difficulty', 255);
$table->string('url', 255);
});
Schema::enableForeignKeyConstraints();
}

Answer 1

You are fetching entry by category_id, no need to find the Entry again.
$category = Entry::find($entry->category_id)->categories()->first();
Should be
$category = $entry->category;
BelongsTo is a singular relation and can be described as below.
public function category() {
return $this->belongsTo(Category::class);
}