autolab / Autolab

Course management service that enables auto-graded programming assignments.
http://www.autolabproject.com/
Apache License 2.0
757 stars 215 forks source link

Improve scheduler visual run handling of return value from update method #2165

Closed damianhxy closed 4 months ago

damianhxy commented 4 months ago

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
Screenshot 2024-05-23 at 08 17 19

returning nil

module Updater
    def self.update(course)
        nil
    end
end
Screenshot 2024-05-23 at 08 17 00

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

Screenshot 2024-05-23 at 08 16 50

Types of changes

Checklist:

Other issues / help required

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

coderabbitai[bot] commented 4 months ago
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`. |

Recent Review Details **Configuration used: CodeRabbit UI** **Review profile: CHILL**
Commits Files that changed from the base of the PR and between 604ad14de7bee02f4ed6651505203e4ddddecc10 and 5b7c0c9e2851de03861f1f8d9122c9080340afea.
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 --- 8: Expected: 1; Actual: 0; Below Headings should be surrounded by blank lines --- 28: Expected: 1; Actual: 0; Below Headings should be surrounded by blank lines --- 12: null Fenced code blocks should be surrounded by blank lines --- 18: null Fenced code blocks should be surrounded by blank lines --- 20: null Fenced code blocks should be surrounded by blank lines --- 40: null Fenced code blocks should be surrounded by blank lines --- 49: null Fenced code blocks should be surrounded by blank lines --- 11: null Emphasis used instead of a heading --- 19: null Emphasis used instead of a heading --- 39: null Emphasis used instead of a heading --- 37: Expected: fenced; Actual: indented Code block style --- 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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