Conveyor Belt provides all the underlying mechanics necessary to write artisan commands that process lots of data efficiently.

# composer require glhd/conveyor-belt

To use Conveyor Belt, use one of the conveyor belt traits in your Laravel command:

• \Glhd\ConveyorBelt\IteratesIdQuery — use this if your underlying query can be ordered by id (improves performance)
• \Glhd\ConveyorBelt\IteratesQuery — use this if your query is not ordered by id

• \Glhd\ConveyorBelt\IteratesSpreadsheet — use this to read CSV or Excel files
• \Glhd\ConveyorBelt\IteratesJson — use this to read JSON files or JSON API data

• \Glhd\ConveyorBelt\IteratesEnumerable — use this to work with any generic data source

Most commands can be configured by setting public properties on the command itself. For example, if you want to enable exception handling, you would add public $collect_exceptions = true; to your command. Each config option can also be managed by overriding a function (if you need more dynamic control over its value). See the source of each trait to find the appropriate function name.

• $collect_exceptions — set to true to have your command continue to run if an exception is triggered (the exception will be printed at the end of command execution)
• $row_name — set this to customize command output (e.g. if you're operating on User models you could set this to "user")
• $row_name_plural — the plural of $row_name (usually not necessary, as we use Str::plural for you)

• $chunk_size — the number of database records to load at one time
• $use_transaction — whether to run the whole command inside a database transaction (can cause locking issues if your command runs for a long time)

The IteratesIdQuery trait accepts all the options that IteratesQuery does, as well as:

• $id_column — the name of your ID column (if it is not "id")
• $id_alias — the alias to your ID column in your query

• $use_headings — whether to treat the first row of each sheet as headings
• $preserve_empty_rows — whether empty rows should be included
• $format_dates — whether date columns should be formatted (typically you don't need this because Conveyor Belt automatically converts date cells to Carbon instances for you)
• $filename — the file to load (only set if this is not dynamic in any way, which is unusual)
• $excel_temp_directory — set if you need to customize where temp files are stored
• $field_delimiter — change this if you need to import non-standard CSV files (e.g. tab-delimited)
• $field_enclosure — change this if you need to import non-standard CSV files (that don't use the " character)
• $spreadsheet_encoding — change this if you're dealing with non-UTF-8 data
• $heading_format — Change this to any Str:: function to change the format of your array keys ("snake" by default)

• $filename — the file to load (only set if this is not dynamic in any way, which is unusual)
• $json_endpoint — the JSON endpoint to query for data (use getJsonEndpoint to set this dynamically)
• $json_pointer — use this to iterate over nested JSON data (see spec)

class ProcessUnverifiedUsers extends Command
{
  use \Glhd\ConveyorBelt\IteratesIdQuery;
  
  // By setting $collect_exceptions to true, we tell Conveyor Belt to catch
  // and log exceptions for display, rather than aborting execution
  public $collect_exceptions = true;
  
  // First, set up the query for the data that your command will operate on.
  // In this example, we're querying for all users that haven't verified their emails.
  public function query()
  {
    return User::query()
      ->whereNull('email_verified_at')
      ->orderBy('id');
  }
  
  // Then, set up a handler for each row. Our example command is either going to
  // remind users to verify their email (if they signed up recently), or queue
  // a job to prune them from the database.
  public function handleRow(User $user)
  {
    // The `progressMessage()` method updates the progress bar in normal mode,
    // or prints the message in verbose/step mode
    $this->progressMessage("{$user->name} <{$user->email}>");
    
    $days = $user->created_at->diffInDays(now());
    
    // The `progressSubMessage()` method adds additional context. If you're in
    // normal mode, this gets appended to the `progressMessage()`. In verbose or
    // step mode, this gets added as a list item below your `progressMessage()`
    $this->progressSubMessage('Registered '.$days.' '.Str::plural('day', $days).' ago…');
    
    // Sometimes our command trigger exceptions. Conveyor Belt makes it easy
    // to handle them and not have to lose all our progress
    ThirdParty::checkSomethingThatMayFail();
    
    if (1 === $days) {
      $this->progressSubmessage('Sending reminder');
      Mail::send(new EmailVerificationReminderMail($user));
    }
    
    if ($days >= 7) {
      $this->progressSubmessage('Queuing to be pruned');
      PruneUnverifiedUserJob::dispatch($user);
    }
  }
}

class ProcessSignUpSheet extends Command
{
  use \Glhd\ConveyorBelt\IteratesSpreadsheet;
  
  // Conveyor Belt will automatically pick up a "filename" argument. If one
  // is missing you can set a $filename property or implement the getSpreadsheetFilename method
  protected $signature = 'process:sign-up-sheet {filename}';
  
  public function handleRow($item)
  {
    // $item is an object keyed by the spreadsheet headings in snake_case,
    // so for example, the following CSV:
    //
    // Full Name, Sign Up Date, Email
    // Chris Morrell, 2022-01-02, [email protected]
    //
    // Will result in a full_name, sign_up_date, and email property
    // on the $item object. You can change from snake case to any other
    // string helper format by setting $heading_format
  }
}

The IteratesJson trait works exactly the same as the IteratesSpreadsheet trait, just with different configuration options.