Automatically send a voucher for the ticket when a grant is accepted

[marcoacierno]

Like we do for speakers, when a user accepts a grant, we want to automatically create and send them a voucher for their free ticket

[marcoacierno]

@claude work on this

[claude]

Claude finished @marcoacierno's task in 5m 32s —— View job • claude/issue-4572-20260209-1808 • Create PR ➔

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Completed: Grant Voucher Auto-Send Feature

• Gather context on existing grant and voucher systems
• Understand speaker voucher implementation as reference
• Implement voucher creation for accepted grants
  • Add Celery task create_and_send_grant_voucher in grants/tasks.py
  • Trigger task when grant status changes to confirmed in the GraphQL mutation
• Add tests for the new functionality
• Commit and push changes

Summary

Implemented automatic voucher creation and email sending when a user accepts a grant. When a grantee confirms their grant via the send_grant_reply GraphQL mutation, the system now:

1. Creates a voucher for the free ticket via the Pretix integration
2. Sends an email with the voucher code to the grantee

The implementation follows the same pattern as the speaker voucher system:

• grants/tasks.py: Added create_and_send_grant_voucher Celery task that:

  • Checks if user already has a voucher (skips if speaker voucher exists)
  • Upgrades co-speaker voucher to grant voucher if applicable
  • Creates new voucher via create_conference_voucher() with Pretix sync
  • Sends voucher email via send_conference_voucher_email.delay()

• api/grants/mutations.py: Modified send_grant_reply mutation to call the voucher task when status changes to confirmed

• Tests added for:

  • Basic voucher creation and email sending
  • Case where user already has a speaker voucher (should skip)
  • Case where user has co-speaker voucher (should upgrade to grant voucher)
  • Mutation tests for confirmed/refused status handling

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