diff --git a/src/flow.rs b/src/flow.rs
index 1b420b7..c44134d 100644
--- a/src/flow.rs
+++ b/src/flow.rs
@@ -4,8 +4,10 @@ use mongod::{assert_reference_of, reference_of, Reference, Validate};
 
 #[derive(Debug, Clone, Serialize, Deserialize, Model, Referencable)]
 pub struct FlowInfo {
+    #[serde(default)]
     pub _id: String,
     pub name: String,
+    #[serde(default)]
     pub depends: Vec<String>,
     pub next: Option<String>,
     pub produces: Option<Vec<String>>,