add additional properties support

generator/src/main.rs

@@ -738,6 +738,14 @@ fn create_struct_for_definition(
         }
     }
 
+    if let Some(additonal_schema) = &schema.additional_properties {
+        let prop_ty = schema_ref_type_name(spec, additonal_schema)?;
+        fields.push_str("#[serde(flatten)]\n");
+        fields.push_str("pub additional: std::collections::BTreeMap<String, ");
+        fields.push_str(&prop_ty);
+        fields.push_str(">,\n");
+    }
+
     let out = format!("{docs}#[derive(Debug, Clone, PartialEq, serde::Serialize, serde::Deserialize)]\npub struct {name} {{\n{fields}}}\n\n");
     Ok(out)
 }

generator/src/openapi.rs

@@ -249,6 +249,7 @@ pub struct Schema {
     #[serde(rename = "type")]
     pub _type: Option<SchemaType>,
     pub properties: Option<BTreeMap<String, MaybeRef<Schema>>>,
+    pub additional_properties: Option<Box<MaybeRef<Schema>>>,
     pub items: Option<Box<MaybeRef<Schema>>>,
 
     pub discriminator: Option<String>,

src/generated.rs

@@ -7870,7 +7870,10 @@ pub mod structs {
     /// required are "content_type" and "url" Required
     ///
     #[derive(Debug, Clone, PartialEq, serde::Serialize, serde::Deserialize)]
-    pub struct CreateHookOptionConfig {}
+    pub struct CreateHookOptionConfig {
+        #[serde(flatten)]
+        pub additional: std::collections::BTreeMap<String, String>,
+    }
 
     /// CreateIssueCommentOption options for creating a comment on an issue
     ///