How to display a hasMany() relationship through a table in a view. - php

Question

I'm trying to display a table in my view with contents that consists of information from my Location table (Addr, City, etc...) and Resource table (Name, Descr.), they're linked by ID's through a ResourceLocation Table. Here's what I have so far:
Resource Controller
....
public function resource()
{
$resources = Resource::all();
return view('pages.resource', compact('resources'));
}
public function location()
{
$locations = Location::all
return view (compact('locations'));
}
public function resourcelocation()
{
$resourcelocations = ResourceLocation::all();
return view (compact ('resourcelocations'));
}
...
ResourceLocation Model
/**
* Class ResourceLocation
*/
class ResourceLocation extends Model
{
...
public function resource ()
{
return $this->belongsTo('App\Models\Resource');
}
public function location ()
{
return $this->belongsTo('App\Models\Location');
}
}
Resource Model
/**
* Class Resource
*/
class Resource extends Model
{
...
/** A resource can have many locations */
public function location()
{
return $this->hasMany('App\Models\ResourceLocation');
}
}
Location Model
/**
* Class Location
*/
class Location extends Model
{
...
public function resource()
{
return $this->hasMany('App\ResourceLocation');
}
}
resource.blade.php
<table>
<tr>
<th>Resource Name</th>
<th>Description</th>
<th>Address</th>
<th>City</th>
<th>Zip Code</th>
<th>County</th>
</tr>
#foreach ($resourcelocations as $resourcelocation)
<tr>
<td> {{ $resourcelocation->id }}</td>
<td>
#foreach ($resourcelocation->resources as $resource)
{{ $resource->Name }},
#endforeach
</td>
<td>
#foreach($resourcelocations->locations as $location)
{{ $location->City }}
#endforeach
</td>
</tr>
#endforeach
</table>
I just wanted to add a column or two to see if it was working, but I keep getting an undefined variable on resourcelocations, still trying to wrap my head around laravel and how the relationships work, so maybe my logic is messed up. Any help would be great!
Thanks.

Answer 1

There seems to be some confusion in your relationships. I think it could work with the way you have it but you are making it much more confusing than it needs to be.
First, start with removing the ResourceLocation model. You can relate resources and locations directly without need of the intermediary model (you will still need that table though). This is what's called a belongs-to-many relationship.
I also recommend when you have a relationship which can return many records (for example if a resource can have many locations) you should name the method which relates these locations rather than location.
With all that in mind, your Resource model gets...
public function locations()
{
return $this->belongsToMany('App\Models\Location', 'ResourceLocation');
}
Where I put 'ResourceLocation', that should be whatever you named your pivot table.
Same for your Location model which receives.
public function resources()
{
return $this->belongsToMany('App\Models\Resource', 'ResourceLocation');
}
Now that should be greatly simplified, we just replaced 4 relationship methods and 3 models for 2 relationship methods and 2 models.
Now for your controller, it's much more efficient to use eager loading to grab all your resource locations.
$resources = Resource::with('locations')->get();
And in your view...
#foreach ($resources as $resource)
#foreach ($resource->locations as $location)
<tr>
<td>{{ $resource->id }}</td>
<td>{{ $location->name }}</td>
</tr>
#endforeach
#endforeach

Answer 2

In your Resource Controller you are not passing any resourcelocation variable as I can see only resources has been called. try declaring the variable in array in this line return view('pages.resource', compact('resources'));
To get the first element in hasMany you can try below:
$resource->location()->first();
you can use dd(variable_name) before sending the data to the view to get a better idea of how your data is managed