Fixed usage of Self in a model's fields

Fixes #66

rorm-macro/Cargo.toml

@@ -16,7 +16,7 @@ proc-macro = true
 
 [dependencies]
 # syn builds rust syntax trees from strings or tokenstream
-syn = { version = "~1" }
+syn = { version = "~1", features = ["full", "visit-mut"] }
 # quote provides a macro to write rust code with template variables which then produces a tokenstream
 quote = { version = "~1" }
 # a higher level wrapper for rust's proc-macro which is used by syn and quote
@@ -28,8 +28,5 @@ darling = { version = "~0.14" }
 rustc_version = "0.4.0"
 
 [features]
-default = [
-    "syn/full"
-]
 # requires nightly rust
 unstable = []

rorm-macro/src/analyze/model.rs

@@ -1,5 +1,6 @@
 use proc_macro2::Ident;
 use quote::format_ident;
+use syn::visit_mut::VisitMut;
 use syn::{LitInt, LitStr, Type, Visibility};
 
 use crate::analyze::vis_to_display;
@@ -39,7 +40,7 @@ pub fn analyze_model(parsed: ParsedModel) -> darling::Result<AnalyzedModel> {
         let ParsedField {
             vis,
             ident,
-            ty,
+            mut ty,
             annos:
                 ModelFieldAnnotations {
                     auto_create_time,
@@ -86,6 +87,17 @@ pub fn analyze_model(parsed: ParsedModel) -> darling::Result<AnalyzedModel> {
             auto_increment = true;
         }
 
+        // Replace `Self` in the field's type to the model's identifier
+        struct ReplaceSelf<'a>(&'a Ident);
+        impl<'a> VisitMut for ReplaceSelf<'a> {
+            fn visit_ident_mut(&mut self, i: &mut Ident) {
+                if i == "Self" {
+                    *i = self.0.clone();
+                }
+            }
+        }
+        ReplaceSelf(model_ident).visit_type_mut(&mut ty);
+
         analyzed_fields.push(AnalyzedField {
             vis,
             unit: format_ident!("__{}_{}", model_ident, ident),