Fixes for unreachable project issues when transfer repository from organization (#31770) (#31828)

Backport #31770 by @emrebdr

When transferring repositories that have issues linked to a project
board to another organization, the issues remain associated with the
original project board. This causes the columns in the project board to
become bugged, making it difficult to move other issues in or out of the
affected columns. As a solution, I removed the issue relations since the
other organization does not have this project table.

Fix for #31538

Co-authored-by: Edip Emre Bodur <emrebdr29@gmail.com>
Co-authored-by: Jason Song <i@wolfogre.com>

models/project/issue.go

@@ -141,3 +141,9 @@ func (b *Board) moveIssuesToAnotherColumn(ctx context.Context, newColumn *Board)
 		return nil
 	})
 }
+
+// DeleteAllProjectIssueByIssueIDsAndProjectIDs delete all project's issues by issue's and project's ids
+func DeleteAllProjectIssueByIssueIDsAndProjectIDs(ctx context.Context, issueIDs, projectIDs []int64) error {
+	_, err := db.GetEngine(ctx).In("project_id", projectIDs).In("issue_id", issueIDs).Delete(&ProjectIssue{})
+	return err
+}

models/project/project.go

@@ -319,6 +319,12 @@ func GetProjectForRepoByID(ctx context.Context, repoID, id int64) (*Project, err
 	return p, nil
 }
 
+// GetAllProjectsIDsByOwnerID returns the all projects ids it owns
+func GetAllProjectsIDsByOwnerIDAndType(ctx context.Context, ownerID int64, projectType Type) ([]int64, error) {
+	projects := make([]int64, 0)
+	return projects, db.GetEngine(ctx).Table(&Project{}).Where("owner_id=? AND type=?", ownerID, projectType).Cols("id").Find(&projects)
+}
+
 // UpdateProject updates project properties
 func UpdateProject(ctx context.Context, p *Project) error {
 	if !IsCardTypeValid(p.CardType) {