Add container.FilterSlice function (#30339)

Many places have the following logic:
```go
func (jobs ActionJobList) GetRunIDs() []int64 {
	ids := make(container.Set[int64], len(jobs))
	for _, j := range jobs {
		if j.RunID == 0 {
			continue
		}
		ids.Add(j.RunID)
	}
	return ids.Values()
}
```

this introduces a `container.FilterMapUnique` function, which reduces
the code above to:
```go
func (jobs ActionJobList) GetRunIDs() []int64 {
	return container.FilterMapUnique(jobs, func(j *ActionRunJob) (int64, bool) {
		return j.RunID, j.RunID != 0
	})
}
```

5 files changed, 46 insertions, 93 deletions

diff --git a/models/issues/comment.go b/models/issues/comment.go
index 6f65a5dbbc..353163ebd6 100644
--- a/models/issues/comment.go
+++ b/models/issues/comment.go
@@ -1272,10 +1272,9 @@ func InsertIssueComments(ctx context.Context, comments []*Comment) error {
 		return nil
 	}
 
-	issueIDs := make(container.Set[int64])
-	for _, comment := range comments {
-		issueIDs.Add(comment.IssueID)
-	}
+	issueIDs := container.FilterSlice(comments, func(comment *Comment) (int64, bool) {
+		return comment.IssueID, true
+	})
 
 	ctx, committer, err := db.TxContext(ctx)
 	if err != nil {
@@ -1298,7 +1297,7 @@ func InsertIssueComments(ctx context.Context, comments []*Comment) error {
 		}
 	}
 
-	for issueID := range issueIDs {
+	for _, issueID := range issueIDs {
 		if _, err := db.Exec(ctx, "UPDATE issue set num_comments = (SELECT count(*) FROM comment WHERE issue_id = ? AND `type`=?) WHERE id = ?",
 			issueID, CommentTypeComment, issueID); err != nil {
 			return err
diff --git a/models/issues/comment_list.go b/models/issues/comment_list.go
index 0047b054ba..370b5396e0 100644
--- a/models/issues/comment_list.go
+++ b/models/issues/comment_list.go
@@ -17,13 +17,9 @@ import (
 type CommentList []*Comment
 
 func (comments CommentList) getPosterIDs() []int64 {
-	posterIDs := make(container.Set[int64], len(comments))
-	for _, comment := range comments {
-		if comment.PosterID > 0 {
-			posterIDs.Add(comment.PosterID)
-		}
-	}
-	return posterIDs.Values()
+	return container.FilterSlice(comments, func(c *Comment) (int64, bool) {
+		return c.PosterID, c.PosterID > 0
+	})
 }
 
 // LoadPosters loads posters
@@ -44,13 +40,9 @@ func (comments CommentList) LoadPosters(ctx context.Context) error {
 }
 
 func (comments CommentList) getLabelIDs() []int64 {
-	ids := make(container.Set[int64], len(comments))
-	for _, comment := range comments {
-		if comment.LabelID > 0 {
-			ids.Add(comment.LabelID)
-		}
-	}
-	return ids.Values()
+	return container.FilterSlice(comments, func(comment *Comment) (int64, bool) {
+		return comment.LabelID, comment.LabelID > 0
+	})
 }
 
 func (comments CommentList) loadLabels(ctx context.Context) error {
@@ -94,13 +86,9 @@ func (comments CommentList) loadLabels(ctx context.Context) error {
 }
 
 func (comments CommentList) getMilestoneIDs() []int64 {
-	ids := make(container.Set[int64], len(comments))
-	for _, comment := range comments {
-		if comment.MilestoneID > 0 {
-			ids.Add(comment.MilestoneID)
-		}
-	}
-	return ids.Values()
+	return container.FilterSlice(comments, func(comment *Comment) (int64, bool) {
+		return comment.MilestoneID, comment.MilestoneID > 0
+	})
 }
 
 func (comments CommentList) loadMilestones(ctx context.Context) error {
@@ -137,13 +125,9 @@ func (comments CommentList) loadMilestones(ctx context.Context) error {
 }
 
 func (comments CommentList) getOldMilestoneIDs() []int64 {
-	ids := make(container.Set[int64], len(comments))
-	for _, comment := range comments {
-		if comment.OldMilestoneID > 0 {
-			ids.Add(comment.OldMilestoneID)
-		}
-	}
-	return ids.Values()
+	return container.FilterSlice(comments, func(comment *Comment) (int64, bool) {
+		return comment.OldMilestoneID, comment.OldMilestoneID > 0
+	})
 }
 
 func (comments CommentList) loadOldMilestones(ctx context.Context) error {
@@ -180,13 +164,9 @@ func (comments CommentList) loadOldMilestones(ctx context.Context) error {
 }
 
 func (comments CommentList) getAssigneeIDs() []int64 {
-	ids := make(container.Set[int64], len(comments))
-	for _, comment := range comments {
-		if comment.AssigneeID > 0 {
-			ids.Add(comment.AssigneeID)
-		}
-	}
-	return ids.Values()
+	return container.FilterSlice(comments, func(comment *Comment) (int64, bool) {
+		return comment.AssigneeID, comment.AssigneeID > 0
+	})
 }
 
 func (comments CommentList) loadAssignees(ctx context.Context) error {
@@ -237,14 +217,9 @@ func (comments CommentList) loadAssignees(ctx context.Context) error {
 
 // getIssueIDs returns all the issue ids on this comment list which issue hasn't been loaded
 func (comments CommentList) getIssueIDs() []int64 {
-	ids := make(container.Set[int64], len(comments))
-	for _, comment := range comments {
-		if comment.Issue != nil {
-			continue
-		}
-		ids.Add(comment.IssueID)
-	}
-	return ids.Values()
+	return container.FilterSlice(comments, func(comment *Comment) (int64, bool) {
+		return comment.IssueID, comment.Issue == nil
+	})
 }
 
 // Issues returns all the issues of comments
@@ -311,16 +286,12 @@ func (comments CommentList) LoadIssues(ctx context.Context) error {
 }
 
 func (comments CommentList) getDependentIssueIDs() []int64 {
-	ids := make(container.Set[int64], len(comments))
-	for _, comment := range comments {
+	return container.FilterSlice(comments, func(comment *Comment) (int64, bool) {
 		if comment.DependentIssue != nil {
-			continue
-		}
-		if comment.DependentIssueID > 0 {
-			ids.Add(comment.DependentIssueID)
+			return 0, false
 		}
-	}
-	return ids.Values()
+		return comment.DependentIssueID, comment.DependentIssueID > 0
+	})
 }
 
 func (comments CommentList) loadDependentIssues(ctx context.Context) error {
@@ -375,15 +346,9 @@ func (comments CommentList) loadDependentIssues(ctx context.Context) error {
 
 // getAttachmentCommentIDs only return the comment ids which possibly has attachments
 func (comments CommentList) getAttachmentCommentIDs() []int64 {
-	ids := make(container.Set[int64], len(comments))
-	for _, comment := range comments {
-		if comment.Type == CommentTypeComment ||
-			comment.Type == CommentTypeReview ||
-			comment.Type == CommentTypeCode {
-			ids.Add(comment.ID)
-		}
-	}
-	return ids.Values()
+	return container.FilterSlice(comments, func(comment *Comment) (int64, bool) {
+		return comment.ID, comment.Type.HasAttachmentSupport()
+	})
 }
 
 // LoadAttachmentsByIssue loads attachments by issue id
@@ -451,13 +416,9 @@ func (comments CommentList) LoadAttachments(ctx context.Context) (err error) {
 }
 
 func (comments CommentList) getReviewIDs() []int64 {
-	ids := make(container.Set[int64], len(comments))
-	for _, comment := range comments {
-		if comment.ReviewID > 0 {
-			ids.Add(comment.ReviewID)
-		}
-	}
-	return ids.Values()
+	return container.FilterSlice(comments, func(comment *Comment) (int64, bool) {
+		return comment.ReviewID, comment.ReviewID > 0
+	})
 }
 
 func (comments CommentList) loadReviews(ctx context.Context) error {
diff --git a/models/issues/issue_list.go b/models/issues/issue_list.go
index 218891ad35..1b05f0aa35 100644
--- a/models/issues/issue_list.go
+++ b/models/issues/issue_list.go
@@ -74,11 +74,9 @@ func (issues IssueList) LoadRepositories(ctx context.Context) (repo_model.Reposi
 }
 
 func (issues IssueList) getPosterIDs() []int64 {
-	posterIDs := make(container.Set[int64], len(issues))
-	for _, issue := range issues {
-		posterIDs.Add(issue.PosterID)
-	}
-	return posterIDs.Values()
+	return container.FilterSlice(issues, func(issue *Issue) (int64, bool) {
+		return issue.PosterID, true
+	})
 }
 
 func (issues IssueList) loadPosters(ctx context.Context) error {
@@ -193,11 +191,9 @@ func (issues IssueList) loadLabels(ctx context.Context) error {
 }
 
 func (issues IssueList) getMilestoneIDs() []int64 {
-	ids := make(container.Set[int64], len(issues))
-	for _, issue := range issues {
-		ids.Add(issue.MilestoneID)
-	}
-	return ids.Values()
+	return container.FilterSlice(issues, func(issue *Issue) (int64, bool) {
+		return issue.MilestoneID, true
+	})
 }
 
 func (issues IssueList) loadMilestones(ctx context.Context) error {
diff --git a/models/issues/reaction.go b/models/issues/reaction.go
index d5448636fe..eb7faefc79 100644
--- a/models/issues/reaction.go
+++ b/models/issues/reaction.go
@@ -305,14 +305,12 @@ func (list ReactionList) GroupByType() map[string]ReactionList {
 }
 
 func (list ReactionList) getUserIDs() []int64 {
-	userIDs := make(container.Set[int64], len(list))
-	for _, reaction := range list {
+	return container.FilterSlice(list, func(reaction *Reaction) (int64, bool) {
 		if reaction.OriginalAuthor != "" {
-			continue
+			return 0, false
 		}
-		userIDs.Add(reaction.UserID)
-	}
-	return userIDs.Values()
+		return reaction.UserID, true
+	})
 }
 
 func valuesUser(m map[int64]*user_model.User) []*user_model.User {
diff --git a/models/issues/review_list.go b/models/issues/review_list.go
index ec6cb07988..7b8c3d319c 100644
--- a/models/issues/review_list.go
+++ b/models/issues/review_list.go
@@ -38,12 +38,11 @@ func (reviews ReviewList) LoadReviewers(ctx context.Context) error {
 }
 
 func (reviews ReviewList) LoadIssues(ctx context.Context) error {
-	issueIDs := container.Set[int64]{}
-	for i := 0; i < len(reviews); i++ {
-		issueIDs.Add(reviews[i].IssueID)
-	}
+	issueIDs := container.FilterSlice(reviews, func(review *Review) (int64, bool) {
+		return review.IssueID, true
+	})
 
-	issues, err := GetIssuesByIDs(ctx, issueIDs.Values())
+	issues, err := GetIssuesByIDs(ctx, issueIDs)
 	if err != nil {
 		return err
 	}