Laravel 5 : Learn Easy: Computer Programming For Everybody by Sanjib Sinha

Author:Sanjib Sinha [Sinha, Sanjib]
Language: eng
Format: azw3
Published: 2016-03-27T04:00:00+00:00

$this­>songs = $songs;

}

//code ended

And now we need not inject Model Song object to our index() method any more. So instead of writing that:

public function index(Song $songs)

{

$songs = $songs­->get();

return view('songs.songs', ['songs' => $songs]);

}

//code ended

We can write this:

//code starting

public function index()

{

$songs = $this­->songs­->get();

return view('songs.songs', ['songs' =>

$songs]);

}

//code ended

And our show() methods also changes as we can safely write something like this:

//code starting

public function show($songs)

{

$songs = $this­>songs;

return view('songs.showsongs', ['songs' =>

$songs]);

}

//code eneded

Finally I would like to show one more thing before concluding this part of Model dependencies injection. There are few more useful methods to fetch either 'songs' table in array or in a simple JSON format. It is very nice and handy. So let us have a look at it.

For a quick demo, we have a route like this:

get('songsall', 'SongsController@test');

And in the 'SongsController' test() method we have something like this:

//code starting

public function test()

{

$songs = $this­->songs­->get()­>toArray();

return $songs;

}

//code ended

We have already injected Model Song in our construct so we could grab all the values in our $songs object and return them. Same is true for a JSON format. We could have changed that method to this:

//code starting

public function test()

{

$songs = $this­->songs-­>get()­>toJson();

return $songs;

}

//code ended

And the output of JSON format is as expected:

//output starting

[{"id":"1","singer_id":null,"user_id":null,"title":"Baby do you wanna

dance","slug":"baby-do-you-wanna-dance","lyrics":null,"created_at":"2015-07-17

00:49:58","updated_at":"2015-07-17 01:03:44"},

{"id":"2","singer_id":null,"user_id":null,"title":"Rasputin","slug":"rasputin","ly

rics":null,"created_at":"2015-07-17 01:11:32","updated_at":"2015-07-17

01:11:32"},{"id":"3","singer_id":null,"user_id":null,"title":"I have a

dream","slug":"i-have-a-dream","lyrics":null,"created_at":"2015-07-17

01:12:10","updated_at":"2015-07-17 01:12:10"},

{"id":"4","singer_id":null,"user_id":null,"title":"Money, Money,

Money","slug":"money-money-money","lyrics":null,"created_at":"2015-07-17

01:12:53","updated_at":"2015-07-17 01:12:53"}]

//output ended

Next we will very quickly have a look at few methods. Say if we write in our test() method:

public function test()

{

$songs = Song::findOrNew(2);

return $songs;

}

We get back the details of the song with ID 2. If we write something like this inside our test() method:

$songs = Song::where('id', 2)­->first();

return $songs;

We get the same effect.

Suppose you have created a Singer Model where in your table 'singers' you have a record of 'age' of the singers, then You can have a not found exception with this codes:

$singers = Singers::where('age', '>', 75)­ ->firstOrFail();

return $singers;

There are many like through your User Model you can mathematically calculate in your 'users' table like this:

$count = User::where('active', 1)­->count();

$max = User::where('active', 1)­->max('age');

I would suggest you to go through the source codes and spend as much time as possible to get more acquainted with the new features of Laravel Eloquent operations.

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