I am trying to use Laravel and eloquent to return results based on the following query.
$blogPosts = BlogPosts::with('blog_user', 'blog_categories', 'blog_comments', 'tags')
->orderBy('created_at', 'desc')
->paginate(5);
Ok, so that is fine, it return exactly what it should, all the blog posts with associated relations to other tables.
What I now want to do is return only the $blogPosts where a tag is clicked by the user. So let's say there is a tag "PHP", so I pass in that value as $tag to the method. I then have something like this.
public function tag_search($tag)
{
$blogPosts = BlogPosts::with('blog_user', 'blog_categories', 'blog_comments', 'tags')
->where('tags', $tag)
->orderBy('created_at', 'desc')
->paginate(5);
$categories = BlogCategories::with('blog_posts')->get();
$data = array('blogPosts' => $blogPosts, 'categories' => $categories,
);
return view('blog.index')->with($data);
}
Now my issue is actually relatively simple I guess, if the where clause was a column in the BlogPosts table it would work, I know this because I tried that.
However the above won't work as is, I can only use;
->where('x', y)
Where x is a field in the BlogPosts table. I want to return a set of values where the submitted $tag is the same as one associated to the tags attached to the blog posts.
Make sense? I think I am over thinking it the point I am just not thinking now :)
Add the column field 'tags' to your table and then these queries:
$blogPosts = BlogPosts::with('blog_user', 'blog_categories', 'blog_comments', 'tags')
->where('tags', '=', $tag)
->orderBy('created_at', 'desc')
->paginate(5);
$categories = BlogCategories::with('blog_posts')->get();
return view('blog.index', compact ('categories', 'blogposts'));
Ok so the answer was to use whereHas like this.
$blogPosts = BlogPosts::whereHas('tags', function ($query) use ($tag) {
$query->where('name', $tag);
})->orderBy('created_at', 'desc')
->paginate(5);
That returns a search based on the associated elements.
Related
I have a one to many relationship. So I can use this code to display all posts.
$tag = Tag::where('slug', $slug)->first();
$posts = $tag->posts;
It works correctly but I want to filter child to display. For example:
$posts = $tag::whereHas('posts', function($query){
$query->where('accept', 1)
})->get();
But it gets tags not posts. Any idea how I can solve my problem?
In Post model you have to define relation to tag like this
public function tags(){
return $this->hasMany(Tag::class);
}
and this is how you can get posts from specific tag
$slug = "my-slug";
$posts = Post::whereHas('tags', function($query) use ($slug){
$query->where('slug', $slug)
})->where('accept', 1)->get();
As mentioned by the documentation:
Since all relationships also serve as query builders, you can add further constraints to which comments are retrieved by calling the comments method and continuing to chain conditions onto the query:
$comment = App\Post::find(1)->comments()->where('title', 'foo')->first();
You can change your code to:
$posts = $tag->posts()->where('accept', 1)->get()
You can directly query the relationship.
You can use
$tag = Tag::where('slug', $slug)
->with(['posts' => function($q) {
$q->where('accept', 1);
}])->first();
$posts = $tag->posts;
Controller:
public function index($devicetype)
{
$devices = Device::where('device_type', $devicetype)
->orderBy('created_at', 'desc')
->paginate(config('myapp.pagination.items_per_page'));
return view('devices.general.index', compact('devices'));
}
I am getting the same device multiple times on different pages in my blade.php view.
But dd(Device::where('device_type', $devicetype)->orderBy('created_at', 'desc')->get()); gives me a correct collection without multiple entries.
Any ideas/suggestions?
This is because there are many records with the same created_at value. To fix this, add a second order by id to remove the duplicated show in pagination:
$devices = Device::where('device_type', $devicetype)
->orderBy('created_at', 'desc')
->orderBy('id', 'asc')
->paginate(config('myapp.pagination.items_per_page'));
return view('devices.general.index', compact('devices'));
I'm trying to get a simple list of products with a given category, using Laravel 5's (L5) Model::with() method. But it seems that L5 ignores the category where clause.
The relation in my Product model:
public function categories(){
return $this->belongsToMany('App\Category', 'categories_products');
}
In my Controller:
public function getByCategory($slug){
$return = Product::with(array('categories' => function($query) use ($slug){
$query->where('slug', 'like', $slug);
}))->paginate(60);
dd($return);
}
The result is a list of every product in my database, instead of just a list of those with the given category slug.
I'v tried to hardcode in some different where clauses, but all seems to be ignored. Am I missing something?
Eloquent doesn't use joins to query related data when using with(), but instead uses separate queries. In your example, it first fetches products and then fetches related categories.
You need to use has() or whereHas() to return only those products that have categories (slugs?).
public function getByCategory($slug){
$return = Product::has('categories')->with(array('categories' => function($query) use ($slug){
$query->where('slug', 'like', $slug);
}))->paginate(60);
dd($return);
}
Or:
public function getByCategory($slug){
$return = Product::whereHas('categories', function($query) use ($slug){
$query->where('slug', 'like', $slug);
})->paginate(60);
dd($return);
}
whereHas() adds a subquery that counts the number of relations. You should use DB::getQueryLog() to see the SQL that Eloquent produces. Makes it a lot easier to figure out what's going on!
Do you need to have an advanced subquery? If slug is defined as a column in product you can do this:
$return = Product::where('slug', 'like', $slug)->paginate(60);
dd($return);
Or if using the relations your query would look like this:
$return = Product::where('slug', 'like', $slug)->categories->paginate(60);
dd($return);
I'm trying to return a query that has an arbitrary amount of where clauses based on the number of tags a user submits.
//unknown number of ids to query on
$tag_ids = array(1,5);
//multiple joins with closure
$items = DB::table('archives_items_metadata')->join('tags', 'archives_items_metadata.tag_id', '=', 'tags.id')->join('archives_items', 'archives_items_metadata.archive_item_id', '=', 'archives_items.id')->join('items', 'archives_items.item_id', '=', 'items.id')
->where(function ($query) use ($tag_ids) {
foreach ($tag_ids as $tag_id)
{
$query->where('archives_items_metadata.tag_id', $tag_id);
}
})->get();
The result I get is an empty array even though when I try array(1) or array(5) by themselves, they both return the same item. What am I missing?
EDIT::
I'm looking to return items that have each of the tag ids specified. The reference of items to tags is stored on the archives_items_metadata table. How can I get the result I'm expecting, and what's the most efficient way to accomplish this?
You are looking to do a WHERE tag_id IN (1, 2, 3) style clause laravel has the whereIn($col, $vals) builder function.
->whereIn('archives_items_metadata.tag_id', $tag_ids)
search for "whereIn" in the official docs
$tag_count = count($tag_ids);
$items = DB::table('archives_items')->join('archives_items_metadata', 'archives_items_metadata.archive_item_id', '=', 'archives_items.id')->join('tags', 'archives_items_metadata.tag_id', '=', 'tags.id')
->whereIn('archives_items_metadata.tag_id', $tag_ids)->whereNull('archives_items_metadata.deleted_at')
->groupBy('archives_items_metadata.archive_item_id')->havingRaw('count(*)='.$tag_count->get();
I'm using Laravel 4 and Eloquent ORM. I'm currently pulling records from my database using the following code:
public function index($type, $id)
{
$asset = Asset::where('public_id', '=', $id)
->with('attachments')
->with('attachments.attachment')
->with('tracks')
->with('tracks.track')
->where('locale', '=', Config::get('app.locale'))
->first();
return View::make('view-asset.index')
->with('asset', $asset)
->with('type', $type);
}
The table joined to this query using the with('tracks') statement has a column in it called track_order - I would like to be able to sort the rows returned by this part of the query by that column so that the tracks stored in the database are returned in the correct order.
Is it possible to do this and if so, how should I do it? So far I've tried something like this:
public function index($type, $id)
{
$asset = Asset::where('public_id', '=', $id)
->with('attachments')
->with('attachments.attachment')
->with('tracks')
->with('tracks.track')
->where('locale', '=', Config::get('app.locale'))
->orderBy('tracks.track_order', 'ASC')
->first();
return View::make('view-asset.index')
->with('asset', $asset)
->with('type', $type);
}
Which doesn't work and I can't figure out a way of doing this other than splitting things up into multiple queries.
You most certainly can:
with(['tracks' => function($query)
{
$query->orderBy('track_order', 'asc');
}])
Refer to Eager Loading Contraints in the documentation for more.