How to export data of array to excel with each element from an array storing in single row - excel

Question

I am trying to export data to excel using Fast excel. This is easy for straight forward export. However, I have data as follows:
Illuminate\Support\Collection Object
(
[items:protected] => Array
(
[0] => stdClass Object
(
[id] => 1
[name] => name1
[multiple_units] => ["80","103","126","7","10","13"]
)
[1] => stdClass Object
(
[id] => 2
[name] => name2
[multiple_units] => ["30","23","26","7","25","33"]
)
)
)
Where multiple_units is a text column with json_decode. So, now when I try to export data with following code:
public function exportTest()
{
$reviews = DB::table('test_db')->get();
$file_name = 'Review - '.date('Y_m_d').'.xlsx';
return (new FastExcel($reviews))->download($file_name,function($review){
$unit_lists = '';
if($review->multiple_units != NULL){
$unit_ids = json_decode($review->multiple_units, true);
foreach($unit_ids as $uk => $uv){
return [
'Name' => $review->name,
'Units' => $uv
];
}
}
});
}
It export to excel file like as:
Name Units
name1 80
name2 30
However, I want to export with each unit being in a single row. For instance,
Name Units
name1 80
name1 103
name1 126
name1 7
name1 10
name1 13
...
...
...
...

Answer 1

As far as I can see, Fast Excel does not allow changing the number of rows in the callback function.
The solution is to manipulate the data before passing it to Fast Excel:
public function exportTest()
{
$reviews = DB::table('test_db')->get()->flatMap(function ($review) {
$items = [];
if ($review->multiple_units != NULL) {
$unit_ids = json_decode($review->multiple_units, true);
foreach ($unit_ids as $uk => $uv) {
$items[] = [
'Name' => $review->name,
'Units' => $uv
];
}
}
return $items;
});
$file_name = 'Review - '.date('Y_m_d').'.xlsx';
return (new FastExcel($reviews))->download($file_name);
}
This will map over each review return an array containing name and units for each unit. Then the array is flattened and passed to Fast Excel.
Note: This will ignore any reviews where review->multiple_units == NULL (which includes an empty string)

Answer 2

public function exportTest() {
$reviews = DB::table('test_db')->orderBy('name')->get();
$file_name = 'Review - '.date('Y_m_d').'.xlsx';
return (new FastExcel($reviews))->download($file_name,function($reviews) {
foreach ($reviews as $review) {
# code...
if(!empty($review->multiple_units)) {
$unit_ids = json_decode($review->multiple_units, true);
foreach($unit_ids as $uk => $uv){
return [
'Name' => $review->name,
'Units' => $uv
];
}
}
}
});
}