Laravel dynamic query - laravel

Question

I have a GET form with three filters.
make
Year
country
I need to get all posts from db. But filter the results based on these three filters.
If a country is selected, get posts for that country only or all countries.
if a make is selected, get posts for that make only or all makes
if a year is selected, get posts for that year only or all years
how to write one query that filters all these three options. What I have done is used if and else statements and written different queries for each scenario. That's 9 queries to get one information. Can we make it dynamic and just have one query?
My Example query:
public function search(Request $request)
{
$search=$request->input('search');
if($request->input('country') == "all")
{
$posts = Post::where('status','Published')->orderBy('status_change','DESC')
->where('status','Published')
->where(function($query) use ($search){
$query->where('title','LIKE','%'.$search.'%');
$query->orWhere('model','LIKE','%'.$search.'%');
$query->orWhere('notes','LIKE','%'.$search.'%');
$query->orWhere('description','LIKE','%'.$search.'%');
})
->paginate(25);
}
else
{
$posts = Country::where('country_name', $request->input('country'))->first()->posts()->orderBy('status_change','DESC')
->where('status','Published')
->where(function($query) use ($search){
$query->where('title','LIKE','%'.$search.'%');
$query->orWhere('model','LIKE','%'.$search.'%');
$query->orWhere('notes','LIKE','%'.$search.'%');
$query->orWhere('description','LIKE','%'.$search.'%');
})
->paginate(25);
}
return view('welcome')
->with('published_posts',$posts)
;
}

Answer 1

I think something like this would work:
/**
* #param Request $request
*/
function search(Request $request)
{
$postsQuery = Post::where('status', 'Published');
if ($request->has('country')) {
$country = $request->country;
// assuming relationships are setup correclty
$postsQuery->whereHas('country', function ($query) use ($country) {
$query->where('country_name', 'LIKE', $country);
});
}
if ($request->has('search')) {
$postsQuery->where(function ($query) use ($search) {
$query->where('title', 'LIKE', '%' . $request->search . '%');
$query->orWhere('model', 'LIKE', '%' . $request->search . '%');
$query->orWhere('notes', 'LIKE', '%' . $request->search . '%');
$query->orWhere('description', 'LIKE', '%' . $request->search . '%');
});
}
$postsQuery->orderBy('status_change', 'DESC')->paginate(25);
return view('welcome')->with('published_posts', $result);
}

Answer 2

I used 'when' method.
$make = null;
$year = null;
$country = null;
if($request->filled('make')){
$make = $request->query('make');
}
if($request->filled('year')){
$year = $request->query('year');
}
if($request->filled('country')){
$country = $request->query('country');
}
$posts = DB::table('posts')
->when($make, function($query, $make){
return $query->where("make", "=", $make);
})
->when($year, function($query, $year){
return $query->whereYear("year", "=", $year);
})
->when($country, function($query, $country){
return $query->where('country', "like", $country);
})
->get();
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