Use instance variables instead of flash to display duplicates during roster import

[damianhxy]

Description

Use instance variables instead of flash to properly render roster import errors with large numbers of duplicates.

Motivation and Context

Currently, roster errors are propagated to the view using a flash. However, this results in a cookie overflow error when there are too many duplicates. By using instance variables, we can avoid this problem.

Closes #906

How Has This Been Tested?

roster_duplicates.csv roster_noduplicates.csv

Before PR - duplicates

After PR - duplicates

Also check that uploading rosters with no errors (roster_noduplicates.csv) works as expected.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have run rubocop and erblint for style check. If you haven't, run overcommit --install && overcommit --sign to use pre-commit hook for linting
• [ ] My change requires a change to the documentation, which is located at Autolab Docs
• [ ] I have updated the documentation accordingly, included in this PR

[coderabbitai[bot]]

Walkthrough

## Walkthrough The recent changes focus on improving the roster import process by handling errors more gracefully, specifically addressing issues with duplicate email addresses. Modifications include shifting from a flash-based error message to an instance variable for errors, refining exception handling during CSV parsing, standardizing key access in views, and simplifying flash message rendering. These adjustments aim to provide clearer feedback to the user and avoid import failure due to duplicates, aligning with the objective to make the roster import process more robust and user-friendly. ## Changes | Files | Summary | |-------|---------| | `app/controllers/courses_controller.rb` | Changed the assignment of `flash[:roster_error]` to `@roster_error` and improved exception handling in `parse_roster_csv` method. | | `app/views/courses/upload_roster.html.erb`
`app/views/layouts/application.html.erb` | Standardized key access to use symbols, added conditional error message display, and simplified flash message rendering logic. | ## Assessment against linked issues | Objective | Addressed | Explanation | |-----------|-----------|-------------| | Roster import should not fail on duplicate email addresses (#906) | ✅ | The changes made to the error handling and messaging indicate an approach to allow users to identify and resolve issues with duplicate emails without causing the import process to fail outright. However, without explicit mention of handling duplicates in the provided summaries, the direct approach to cherry-picking duplicates as described in the issue cannot be confirmed. |

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