In most software development projects, code is stored in Git, and code reviews can be easily conducted in a lightweight fashion using GitHub pull requests.
With Appian there is no easy or intuitive way to do this. The only way to review code (that we have found) is to review the object in its totality. For expressions and interfaces you can manually comb through the Version history, pick out the prior definition, and run it through a text diff tool locally, but this is tedious, and doesn't allow collaboration as easily. For process models, it is impossible, which is another reason we try to make our models as small as possible and do everything in SAIL.
Has anyone built a tool for enabling efficient and collaborative code reviews, or is this just generally accepted as a limitation of the Appian product and an impediment to generating high quality code?
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Per Ashok and Christine, there are two levels of reviews - code structure and best practices/design review.
For the former, there is no easy way to do it - SAIL could be maintained in git and potentially diffed. From there, things will get progressively more challenging all the way to process models which at this point have to reviewed visually. As Christine noted, change logs with peer review are the best way in this situation.
As for design reviews, we have best practices checklists for each stage of a project. Additionally, I always start my review with teams running Appian Health Check, which checks for many items on the best practices lists and focusing on the flagged risks. It is incredibly useful - at some point teams include it into the delivery cycle and only escalate items that they are having a hard time resolving.