Codegen mod.rs include prelude

sea-orm-codegen/src/entity/writer.rs

@@ -44,11 +44,18 @@ impl EntityWriter {
     pub fn write_mod(&self) -> OutputFile {
         let mut lines = Vec::new();
         Self::write_doc_comment(&mut lines);
-        let code_blocks = self
+        let code_blocks: Vec<TokenStream> = self
             .entities
             .iter()
             .map(|entity| Self::gen_mod(entity))
             .collect();
+        Self::write(
+            &mut lines,
+            vec![quote! {
+                pub mod prelude;
+            }],
+        );
+        lines.push("".to_owned());
         Self::write(&mut lines, code_blocks);
         OutputFile {
             name: "mod.rs".to_owned(),

sea-orm-codegen/tests/entity/mod.rs

@@ -1,5 +1,7 @@
 //! SeaORM Entity. Generated by sea-orm-codegen 0.1.0
 
+pub mod prelude;
+
 pub mod cake;
 pub mod cake_filling;
 pub mod filling;