Refactor Campground Controller for Better Documentation and Code Quality

[Sumanth077s]

The current implementation of the Campground controller has several areas that could benefit from improved documentation, code structure, and error handling. While the existing functionality appears to be working correctly, enhancing readability and maintainability will aid future developers (including myself) when making updates or debugging.

Proposed Changes:

Documentation:

Improve existing JSDoc comments to include more details about the parameters, return types, and any potential exceptions for each exported function. Include a brief description of the module at the top, explaining its purpose and functionality. Code Structure:

Extract repeated code segments (e.g., calculating average ratings) into utility functions to adhere to the DRY (Don't Repeat Yourself) principle. Consider creating separate modules for handling geocoding, image processing, and error handling to improve separation of concerns. Error Handling:

Ensure consistent error handling across all functions. Use ExpressError or similar to manage different types of errors more gracefully, providing clearer feedback to the client. Add checks for the existence of required request body parameters in the createCampground and updateCampground methods. Variable Naming:

Ensure that variable names are descriptive enough to convey their purpose. For instance, rename q in the search method to query for clarity. Performance Improvements:

Optimize database queries by limiting the fields returned (using .select()) to reduce the amount of data being transferred when not needed. Testing:

Implement unit tests for the utility functions to ensure their correctness.

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