Offline mode

[vdkdamian]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to an issue.

Issue Description

This adds the possibility to use ParseSwift with offline mode. Objects will be stored on device if needed and can be fetched when internet connection is back.

Closes: #39

Approach

I will add playground examples on how to use it.

TODOs before merging

• Test
• Linting
• Add tests
• Add entry to changelog
• Add changes to documentation (guides, repository pages, in-code descriptions)
• Add playground examples

[vdkdamian]

First 4 commits are not correct, don't know how to get em out

[vdkdamian]

I think I need to change the moment om saving the objects locally.
I would need to save to result from a saveCommand in order to get the correct updatedAt date.

@cbaker6 What do you think about this approach?

[cbaker6]

You will need to resolve the merge conflicts and design the local storage following what I mentioned here, https://github.com/parse-community/Parse-Swift/projects/2#card-53117524 to be considered for this repo.

You also didn't fork from this repo, so this PR won't work as is.

[vdkdamian]

You will need to resolve the merge conflicts and design the local storage following what I mentioned here, https://github.com/parse-community/Parse-Swift/projects/2#card-53117524 to be considered for this repo.

Do you think there is something usefull in my code? I looked at the project you mentioned. Seems like a total different approach. Still would look forward if I can help.
I'm learning a lot from you so any help would be appreciated 🙂

You also didn't fork from this repo, so this PR won't work as is.
I'll fix this as soon as possible!

[cbaker6]

From your posts, you have designed this for the parse-community Parse-Swift with the intent of getting it accepted there. I recommend you reach out to them and ask for a code review. I will not review code that’s intended for that repo.