PHP/Laravel get rows with certain column values - php

Question

As can be seen in the linked image, I want to query the records that have the same chapter number (skipping the zeros). Let's say I have 50 chapters, so the query will yield 50 sets, each set corresponding to certain column value i.e. chapter number.
How can I limit the query to that in my Laravel controller?

Answer 1

Get chapter groups, Like drawing in the image
$chapters = Translation::where('chapter', '!=', 0)->get()->groupBy('chapter');

Answer 2

Without pagination:
$chapters = Translation::where('chapter', '!=', 0)->get()->groupBy('chapter');
With pagination :
$posts = Translation::where('chapter', '!=', 0)->orderBy('chapter', 'ASC')->paginate($request->get('per_page', 2));
$grouped_by_chapter = $posts->mapToGroups(function ($post) {
return [$post->chapter => $post];
});
$posts_by_chapter = $posts->setCollection($grouped_by_chapter);
for more: https://laravel.com/docs/8.x/collections#method-groupby

Answer 3

Without knowing more about your project setup, I'd say:
$chapters = DB::table('translations')
->select('chapter')
->distinct()
->where('chapter', '<>', 0)
->get();
If you use eloquent models:
$chapters = Translations::get()
->pluck('chapter')
->flatten()
->filter()
->values()
->all();

Answer 4

In the Elequent model, you can create a hasMany relation to 'translations',
class Chapter extends Model
{
public function translations()
{
return $this->hasMany(Translation::class, 'chapter');
}
and then retrieve the 'Chapter' models with translations.
$chapters = Chapter::with('translations')->get()

Answer 5

A lot of these answers are correct, but I thought I'd offer a different approach.
1. Create a new table
Consider creating an additional table called chapters.
Do this by using the command:
php artisan make:model Chapter -m
This'll create a model and migration.
The migration will look like this:
Schema::create('chapters', function (Blueprint $table) {
$table->id();
$table->integer('number')->unsigned();
$table->string('heading');
$table->timestamps();
});
2. Add the foreign key to your old table
Then modify your model from your screenshot. From here on, I'll assume the same as everyone else, that this table is called translation, with a model called Transaltion.
Your new migration should look like this:
Schema::create('translations', function (Blueprint $table) {
$table->id();
$table->foreignId('chapters_id')->constrained()->onUpdate('cascade')->onDelete('cascade');
$table->string('translation');
$table->timestamps();
});
3. Add the relationship to the models
Translation model
public function chapters()
{
return $this->belongsTo(Chapter::class);
}
Chapter model
public function translations()
{
return $this->hasMany(Translation::class);
}
4. Using the new relationship
Instead of having to use groupBy, or any of the other methods, you now can query on each heading.
An example of some of those below.
4.1 How many chapters do we have?
Chapter::count();
4.2 How many sentences are there in Chapter 1?
Chapter::where('number', 1)->translations()->count();
// or if you want to get a Collection of them
Chapter::where('number', 1)->translations;
// or if you just want a certain few columns
Chapter::where('number', 1)->translations()->select('translation', 'sentence')->get();
4.3 How do I get all chapters and corresponding translations?
$chapters = Chapter::with('translations')->get();
Then in your blade view, do:
#foreach ($chapters as $chapter)
<h1>{{ $chapter->heading }}</h1>
<p>Sentences:</p>
#foreach ($chapter->translations as $sentence)
<p>{{ $sentence }}</p>
#endforeach
#endforeach

Answer 6

Assuming you have a Translation model and want to use Eloquent:
$chapters = Translation::where('chapter', '!=', 0)->get()->groupBy('chapter');
The above says get all Translation where the Chapter they are associated to is not Chapter zero and group all translations by the chapter column. So if you have 50 chapters you'll have 50 collections each with their translations contained within.
If you just want specific columns, you can use select() and provide it with only the columns you want.