diff --git a/models/issue.go b/models/issue.go
index cee9b0ca5c6..c982931c0fd 100644
--- a/models/issue.go
+++ b/models/issue.go
@@ -1402,7 +1402,7 @@ func UpdateIssueMentions(e Engine, issueID int64, mentions []string) error {
 		}
 
 		memberIDs := make([]int64, 0, user.NumMembers)
-		orgUsers, err := GetOrgUsersByOrgID(user.ID)
+		orgUsers, err := getOrgUsersByOrgID(e, user.ID)
 		if err != nil {
 			return fmt.Errorf("GetOrgUsersByOrgID [%d]: %v", user.ID, err)
 		}
diff --git a/models/issue_assignees.go b/models/issue_assignees.go
index 753396e39b4..0fff2dfad55 100644
--- a/models/issue_assignees.go
+++ b/models/issue_assignees.go
@@ -44,7 +44,11 @@ func (issue *Issue) loadAssignees(e Engine) (err error) {
 
 // GetAssigneesByIssue returns everyone assigned to that issue
 func GetAssigneesByIssue(issue *Issue) (assignees []*User, err error) {
-	err = issue.loadAssignees(x)
+	return getAssigneesByIssue(x, issue)
+}
+
+func getAssigneesByIssue(e Engine, issue *Issue) (assignees []*User, err error) {
+	err = issue.loadAssignees(e)
 	if err != nil {
 		return assignees, err
 	}
@@ -173,7 +177,7 @@ func (issue *Issue) changeAssignee(sess *xorm.Session, doer *User, assigneeID in
 		issue.PullRequest.Issue = issue
 		apiPullRequest := &api.PullRequestPayload{
 			Index:       issue.Index,
-			PullRequest: issue.PullRequest.APIFormat(),
+			PullRequest: issue.PullRequest.apiFormat(sess),
 			Repository:  issue.Repo.innerAPIFormat(sess, mode, false),
 			Sender:      doer.APIFormat(),
 		}
diff --git a/models/issue_mail.go b/models/issue_mail.go
index 7f780e667e7..78dbd13def0 100644
--- a/models/issue_mail.go
+++ b/models/issue_mail.go
@@ -48,7 +48,7 @@ func mailIssueCommentToParticipants(e Engine, issue *Issue, doer *User, content
 	}
 
 	// Assignees must receive any communications
-	assignees, err := GetAssigneesByIssue(issue)
+	assignees, err := getAssigneesByIssue(e, issue)
 	if err != nil {
 		return err
 	}
diff --git a/models/issue_user.go b/models/issue_user.go
index 733c35df1f3..58eb5117f81 100644
--- a/models/issue_user.go
+++ b/models/issue_user.go
@@ -54,7 +54,7 @@ func newIssueUsers(e Engine, repo *Repository, issue *Issue) error {
 func updateIssueAssignee(e *xorm.Session, issue *Issue, assigneeID int64) (removed bool, err error) {
 
 	// Check if the user exists
-	assignee, err := GetUserByID(assigneeID)
+	assignee, err := getUserByID(e, assigneeID)
 	if err != nil {
 		return false, err
 	}
diff --git a/models/org.go b/models/org.go
index bba5e22a212..81542f0e606 100644
--- a/models/org.go
+++ b/models/org.go
@@ -393,8 +393,12 @@ func GetOrgUsersByUserID(uid int64, all bool) ([]*OrgUser, error) {
 
 // GetOrgUsersByOrgID returns all organization-user relations by organization ID.
 func GetOrgUsersByOrgID(orgID int64) ([]*OrgUser, error) {
+	return getOrgUsersByOrgID(x, orgID)
+}
+
+func getOrgUsersByOrgID(e Engine, orgID int64) ([]*OrgUser, error) {
 	ous := make([]*OrgUser, 0, 10)
-	err := x.
+	err := e.
 		Where("org_id=?", orgID).
 		Find(&ous)
 	return ous, err
diff --git a/models/repo_watch.go b/models/repo_watch.go
index 95c7e44e938..53a34efdafe 100644
--- a/models/repo_watch.go
+++ b/models/repo_watch.go
@@ -113,15 +113,15 @@ func notifyWatchers(e Engine, act *Action) error {
 
 		switch act.OpType {
 		case ActionCommitRepo, ActionPushTag, ActionDeleteTag, ActionDeleteBranch:
-			if !act.Repo.CheckUnitUser(act.UserID, false, UnitTypeCode) {
+			if !act.Repo.checkUnitUser(e, act.UserID, false, UnitTypeCode) {
 				continue
 			}
 		case ActionCreateIssue, ActionCommentIssue, ActionCloseIssue, ActionReopenIssue:
-			if !act.Repo.CheckUnitUser(act.UserID, false, UnitTypeIssues) {
+			if !act.Repo.checkUnitUser(e, act.UserID, false, UnitTypeIssues) {
 				continue
 			}
 		case ActionCreatePullRequest, ActionMergePullRequest, ActionClosePullRequest, ActionReopenPullRequest:
-			if !act.Repo.CheckUnitUser(act.UserID, false, UnitTypePullRequests) {
+			if !act.Repo.checkUnitUser(e, act.UserID, false, UnitTypePullRequests) {
 				continue
 			}
 		}