Laravel Custom Eloquent Method - php

Question

I have been building queries and repeating code, is there a way to build this into the eloquent model?
I have a model Transaction where I am selecting specific currencies. How can I add this into the model? Is there a way of changing this:
Transaction::select('*')->where('currency', '=', 'GBP')
So that I can do this:
Transaction::select('*')->currency('GBP')
Then in the model it adds onto the query somehow. I've tried to create Transaction::currency but it didn't work. This is just an example and I plan on adding a few selectors to keep the code clean.
class Transaction extends Model
{
protected $table = 'transactions';
public function currency($query, $currency) {
return $query->where('currency', '=', $currency);
}
}

Answer 1

Laravel has such thing called Query Scopes. It allows you to do exactly what you want. You just need to prefix your currency() method with scope keyword like this:
class Transaction extends Model
{
protected $table = 'transactions';
public function scopeCurrency($query, $currency) {
return $query->where('currency', '=', $currency);
}
}
Then you can do this Transaction::select('*')->currency('GBP')
Read more about scopes here

Answer 2

you are almost done,you have to write currency method as query scope.
public function scopeCurrency($query, $currency) {
return $query->where('currency', '=', $currency);
}
after doing that you can use scope like this
Transaction::select('*')->currency('GBP')
For more details go here https://laravel.com/docs/5.2/eloquent#local-scopes

Answer 3

You can do this by using scope.
Add these code to Transaction.php file
public function scopeCustom($query, $column, $exp, $value)
{
return $query->where('votes', $exp, $value); // ('currency', '=', 'GBP')
}
Now use this scope as like
Transaction::select('*')->custom('currency', '=', 'GBP');
Transaction::select('*')->custom('amount', '>', 1000);