[cli] added with-copy-enums flag to cli and conditional derive

sea-orm-cli/src/cli.rs

@@ -163,10 +163,22 @@ pub enum GenerateSubcommands {
             value_parser,
             long,
             default_value = "none",
-            help = "Automatically derive serde Serialize / Deserialize traits for the entity (none, serialize, deserialize, both)"
+            help = "Automatically derive serde Serialize / Deserialize traits for the entity (none,\
+                serialize, deserialize, both)"
         )]
         with_serde: String,
 
+        #[clap(
+            action,
+            long,
+            default_value = "false",
+            long_help = "Automatically derive the Copy trait on generated enums.\n\
+            Enums generated from a database don't have associated data by default, and as such can\
+            derive Copy.
+            "
+        )]
+        with_copy_enums: bool,
+
         #[clap(
             arg_enum,
             value_parser,

sea-orm-cli/src/commands/generate.rs

@@ -24,6 +24,7 @@ pub async fn run_generate_command(
             database_schema,
             database_url,
             with_serde,
+            with_copy_enums,
             date_time_crate,
         } => {
             if verbose {
@@ -167,6 +168,7 @@ pub async fn run_generate_command(
             let writer_context = EntityWriterContext::new(
                 expanded_format,
                 WithSerde::from_str(&with_serde).unwrap(),
+                with_copy_enums,
                 date_time_crate.into(),
                 schema_name,
             );

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

@@ -10,7 +10,7 @@ pub struct ActiveEnum {
 }
 
 impl ActiveEnum {
-    pub fn impl_active_enum(&self, with_serde: &WithSerde) -> TokenStream {
+    pub fn impl_active_enum(&self, with_serde: &WithSerde, with_copy_enums: bool) -> TokenStream {
         let enum_name = &self.enum_name;
         let enum_iden = format_ident!("{}", enum_name.to_camel_case());
         let values = &self.values;
@@ -23,9 +23,14 @@ impl ActiveEnum {
         });
 
         let extra_derive = with_serde.extra_derive();
+        let copy_derive = if with_copy_enums {
+            quote! { , Copy }
+        } else {
+            quote! {}
+        };
 
         quote! {
-            #[derive(Debug, Clone, PartialEq, EnumIter, DeriveActiveEnum #extra_derive)]
+            #[derive(Debug, Clone, PartialEq, EnumIter, DeriveActiveEnum #copy_derive #extra_derive)]
             #[sea_orm(rs_type = "String", db_type = "Enum", enum_name = #enum_name)]
             pub enum #enum_iden {
                 #(

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

@@ -39,6 +39,7 @@ pub enum DateTimeCrate {
 pub struct EntityWriterContext {
     pub(crate) expanded_format: bool,
     pub(crate) with_serde: WithSerde,
+    pub(crate) with_copy_enums: bool,
     pub(crate) date_time_crate: DateTimeCrate,
     pub(crate) schema_name: Option<String>,
 }
@@ -97,12 +98,14 @@ impl EntityWriterContext {
     pub fn new(
         expanded_format: bool,
         with_serde: WithSerde,
+        with_copy_enums: bool,
         date_time_crate: DateTimeCrate,
         schema_name: Option<String>,
     ) -> Self {
         Self {
             expanded_format,
             with_serde,
+            with_copy_enums,
             date_time_crate,
             schema_name,
         }
@@ -116,7 +119,9 @@ impl EntityWriter {
         files.push(self.write_mod());
         files.push(self.write_prelude());
         if !self.enums.is_empty() {
-            files.push(self.write_sea_orm_active_enums(&context.with_serde));
+            files.push(
+                self.write_sea_orm_active_enums(&context.with_serde, context.with_copy_enums),
+            );
         }
         WriterOutput { files }
     }
@@ -200,7 +205,11 @@ impl EntityWriter {
         }
     }
 
-    pub fn write_sea_orm_active_enums(&self, with_serde: &WithSerde) -> OutputFile {
+    pub fn write_sea_orm_active_enums(
+        &self,
+        with_serde: &WithSerde,
+        with_copy_enums: bool,
+    ) -> OutputFile {
         let mut lines = Vec::new();
         Self::write_doc_comment(&mut lines);
         Self::write(&mut lines, vec![Self::gen_import(with_serde)]);
@@ -208,7 +217,7 @@ impl EntityWriter {
         let code_blocks = self
             .enums
             .iter()
-            .map(|(_, active_enum)| active_enum.impl_active_enum(with_serde))
+            .map(|(_, active_enum)| active_enum.impl_active_enum(with_serde, with_copy_enums))
             .collect();
         Self::write(&mut lines, code_blocks);
         OutputFile {