feat: Add permanently delete

[sy-records]

close #1205

[LinkinStars]

Thanks for your contributions.

This feat we need more time to test. For example, I tried permanently deleting users, without deleting content. It can lead to some unpredictable panic.

ERROR   runtime/panic.go:785    http: panic serving 127.0.0.1:60872: runtime error: invalid memory address or nil pointer dereference

/incubator-answer/internal/service/question_common/question.go:451 +0xb88
github.com/apache/incubator-answer/internal/service/content.(*QuestionService).GetQuestionPage(0x14004ebdb00, {0x1066f3af0, 0x14008140a00}, 0x14007003698)

It turns out that some Operator and Revision queries may need to add some checks for permanently deleted users.

[sy-records]

@LinkinStars I have now added delete content after deleting users.

Do we still need to delete Operator and Revision?

[LinkinStars]

@LinkinStars I have now added delete content after deleting users.

Do we still need to delete Operator and Revision?

If an administrator deletes a user by checking the box to also delete the content, then the related questions and answers should be deleted. If the administrator does not check this option, the related content will be retained.

[LinkinStars]

We are almost done. We have tested various scenarios of what might happen. So far, only the following two locations are potentially problematic.

Add default Operator

 runtime/panic.go:785    http: panic serving 127.0.0.1:57957: runtime error: invalid memory address or nil pointer dereference
goroutine 39 [running]:
net/http.(*conn).serve.func1()
        go/pkg/mod/golang.org/[email protected]/src/net/http/server.go:1947 +0x118
panic({0x107a03860?, 0x108dd5e50?})
        go/pkg/mod/golang.org/[email protected]/src/runtime/panic.go:785 +0xf0
github.com/apache/incubator-answer/internal/service/question_common.(*QuestionCommon).FormatQuestionsPage

We can try to add a default operator to solve it.

incubator-answer/internal/service/question_common/question.go

Line 385 in f7731bc

Show: questionInfo.Show,

Operator:         &schema.QuestionPageRespOperator{ID: questionInfo.UserID},

Checking the ActivityUser

http: panic serving 127.0.0.1:58701: runtime error: invalid memory address or nil pointer dereference
goroutine 777 [running]:
net/http.(*conn).serve.func1()
        go/pkg/mod/golang.org/[email protected]/src/net/http/server.go:1947 +0xb0
panic({0x102990920?, 0x103d85cb0?})
        go/pkg/mod/golang.org/[email protected]/src/runtime/panic.go:785 +0x124
github.com/apache/incubator-answer/internal/repo/activity.(*VoteRepo).setActivityRankToZeroIfUserReachLimit(
incubator-answer/internal/repo/activity/vote_repo.go:256 

incubator-answer/internal/repo/activity/vote_repo.go

Line 242 in f7731bc

for _, activity := range op.Activities {

Maybe we can add a checking here, such like

for _, activity := range op.Activities {
		if userInfoMapping[activity.ActivityUserID] == nil {
			continue
		}

[sy-records]

@LinkinStars Thank you for testing! ❤️