diff --git a/entity/src/candidate.rs b/entity/src/candidate.rs
index 221a80e..f020e71 100644
--- a/entity/src/candidate.rs
+++ b/entity/src/candidate.rs
@@ -35,10 +35,18 @@ pub struct Model {
 
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
 pub enum Relation {
+    #[sea_orm(has_one = "super::parent::Entity")]
+    Parent,
     #[sea_orm(has_many = "super::session::Entity")]
     Session,
 }
 
+impl Related<super::parent::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Parent.def()
+    }
+}
+
 impl Related<super::session::Entity> for Entity {
     fn to() -> RelationDef {
         Relation::Session.def()
diff --git a/entity/src/parent.rs b/entity/src/parent.rs
index 7e1b00c..4d107af 100644
--- a/entity/src/parent.rs
+++ b/entity/src/parent.rs
@@ -14,6 +14,19 @@ pub struct Model {
 }
 
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
-pub enum Relation {}
+pub enum Relation {
+    #[sea_orm(
+        belongs_to = "super::candidate::Entity",
+        from = "Column::Application",
+        to = "super::candidate::Column::Application"
+    )]
+    Candidate,
+}
+
+impl Related<super::candidate::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Candidate.def()
+    }
+}
 
 impl ActiveModelBehavior for ActiveModel {}