Added BeforeSave

models/gencloud.go

@@ -199,3 +199,7 @@ type GCUser struct {
 	Username      string `json:"username"`
 	AcdAutoAnswer bool   `json:"acdAutoAnswer"`
 }
+
+func (GCUser) TableName() string {
+	return "gc_users"
+}

models/participant.go

@@ -2,6 +2,8 @@ package models
 
 import (
 	"time"
+
+	"gorm.io/gorm"
 )
 
 type DBParticipant struct {
@@ -23,8 +25,18 @@ type DBParticipant struct {
 	WrapupRequired                   *bool
 
 	Sessions []DBSession `gorm:"foreignKey:ParticipantId;references:Id"`
+	Calls    []DBCall    `gorm:"foreignKey:ParticipantId;references:Id"`
+	User     *GCUser     `gorm:"foreignKey:UserId;references:Id"`
 }
 
 func (DBParticipant) TableName() string {
 	return "gc_participants"
 }
+
+func (p *DBParticipant) BeforeSave(tx *gorm.DB) error {
+	// Convert empty string to nil
+	if p.UserId != nil && *p.UserId == "" {
+		p.UserId = nil
+	}
+	return nil
+}