Improve scheduler visual run handling of return value from update method

[damianhxy]

Description

Check whether return value of update method has a to_str method (used for implicit conversions), rather than just if it's non-nil.

Motivation and Context

The scheduler visual run output feature introduced in #1916 expects that users either return a string or nil from the update method.

However, if an existing user was not aware of the change, they may not have an explicit return. As a result of Ruby's implicit returns, they might return a value that is non-nil yet can not be converted to a string, leading to an error.

How Has This Been Tested?

(Follow the steps in #1916 if unsure how to set up a scheduler)

returning a string

module Updater
    def self.update(course)
        out = ""
        out << "my output\n"

        out
    end
end

returning nil

module Updater
    def self.update(course)
        nil
    end
end

returning non-nil value that can't be converted to a string

module Updater
    def self.update(course)
        true
    end
end

Note: true has a to_s method but NOT a to_str method. So implicit conversions fail.
(same picture as above)

Updated documentation

Types of changes

• 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:

• 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

Other issues / help required

If unsure, feel free to submit first and we'll help you along.

[coderabbitai]

Walkthrough

Walkthrough

The recent changes focus on enhancing the robustness and clarity of the visual_run method in the SchedulersController. Specifically, the method now checks if output can be converted to a string using respond_to?(:to_str) instead of merely checking its truthiness. Additionally, documentation has been updated to stress the importance of explicitly returning nil in the update method of a scheduler to avoid unintended implicit returns in Ruby.

Changes

File Path	Change Summary
app/controllers/schedulers_controller.rb	Updated the visual_run method to check if output responds to to_str instead of checking its truthiness.
docs/features/schedulers.md	Clarified the behavior of returning values in the update method, emphasizing the need to explicitly return nil.

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Recent Review Details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 604ad14 and 5b7c0c9.

Files selected for processing (2)

• app/controllers/schedulers_controller.rb (1 hunks)
• docs/features/schedulers.md (1 hunks)

Additional Context Used

LanguageTool (1)

docs/features/schedulers.md (1)

Near line 50: Using many exclamation marks might seem excessive (in this case: 7 exclamation marks for a text that’s 1029 characters long)
Context: ...t end end ``` Visual Run Output ![Scheduler Visual Run](/images/scheduler...

Markdownlint (13)

docs/features/schedulers.md (13)

29: Expected: 0 or 2; Actual: 1
Trailing spaces

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8: Expected: 1; Actual: 0; Below
Headings should be surrounded by blank lines

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28: Expected: 1; Actual: 0; Below
Headings should be surrounded by blank lines

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12: null
Fenced code blocks should be surrounded by blank lines

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18: null
Fenced code blocks should be surrounded by blank lines

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20: null
Fenced code blocks should be surrounded by blank lines

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40: null
Fenced code blocks should be surrounded by blank lines

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49: null
Fenced code blocks should be surrounded by blank lines

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11: null
Emphasis used instead of a heading

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19: null
Emphasis used instead of a heading

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39: null
Emphasis used instead of a heading

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37: Expected: fenced; Actual: indented
Code block style

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51: null
Files should end with a single newline character

Additional comments not posted (2)

docs/features/schedulers.md (1)

32-37: Clarify the behavior of the update method to prevent unexpected outputs.

app/controllers/schedulers_controller.rb (1)

59-59: Ensure the output can be converted to a string to prevent errors.

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[20wildmanj]

worked locally, lgtm