check condition within query in laravel - php

Question

$q = Order::select(
'orders.*',
'items.date_start',
'items.date_end',
'items.location_name',
'items.category_id'
)
->join('items', 'items.item_id', '=', 'orders.item_id')
->leftJoin('orders_items', function ($join) use ($user_id)
{
$join->on('orders_items.order_id', '=', 'orders.order_id')
->on('orders_items.item_id', '=', 'orders.item_id')
->where('orders_items.user_id', '=', $user_id);
})
->with('Items')
->where(function ($query) use ($select_balance) { // This is where event is in the future, or it has a balance and is not draft.
$query->where('items.date_end', '>=', Carbon\Carbon::now()->toDateString())
->orWhere(function ($query) use ($select_balance) {
$query->where(DB::raw($select_balance), '>', 0)
->whereNotIn('orders.status', [0, 79]);
});
});
i would like to set a condition if (date_start == date_end) then
$query->where('items.date_end', '>=', Carbon\Carbon::now()->toDateString())
->orWhere(function ($query) use ($select_balance) {
$query->where(DB::raw($select_balance), '>', 0)
->whereNotIn('orders.status', [0, 79]);
});
else
$query->where('items.date_end', '>', Carbon\Carbon::now()->toDateString())
->orWhere(function ($query) use ($select_balance) {
$query->where(DB::raw($select_balance), '>', 0)
->whereNotIn('orders.status', [0, 79]);
});
how to set a condition within query i try to end query after ->with(items) but that say $q-> has syntax error please guide and explain how to over come this issue

Answer 1

You can use conditional clauses: https://laravel.com/docs/5.5/queries#conditional-clauses
Animals::when($condition, function($query) {
$query->where('size', 'big');
})->when(!$condition, function($query)) {
$query->where('size', 'small');
})->get();
In the example, if $condition is true then we fetch big animals, otherwise we fetch small animals.