Allow specifying join type

angel_orm_generator/lib/src/orm_build_context.dart

@@ -236,6 +236,16 @@ Future<OrmBuildContext> buildOrmContext(
         localKey ??= '${rcc.snakeCase}_$foreignKey';
       }
 
+      // Figure out the join type.
+      var joinType = JoinType.left;
+      var joinTypeRdr = cr.peek('joinType')?.objectValue;
+      if (joinTypeRdr != null) {
+        var idx = joinTypeRdr.getField('index')?.toIntValue();
+        if (idx != null) {
+          joinType = JoinType.values[idx];
+        }
+      }
+
       var relation = RelationshipReader(
         type,
         localKey: localKey,
@@ -245,6 +255,7 @@ Future<OrmBuildContext> buildOrmContext(
         through: through,
         foreign: foreign,
         throughContext: throughContext,
+        joinType: joinType ?? JoinType.left,
       );
 
       // print('Relation on ${buildCtx.originalClassName}.${field.name} => '

angel_orm_generator/lib/src/readers.dart

@@ -34,6 +34,7 @@ class RelationshipReader {
   final DartType through;
   final OrmBuildContext foreign;
   final OrmBuildContext throughContext;
+  final JoinType joinType;
 
   const RelationshipReader(this.type,
       {this.localKey,
@@ -42,11 +43,14 @@ class RelationshipReader {
       this.cascadeOnDelete,
       this.through,
       this.foreign,
-      this.throughContext});
+      this.throughContext,
+      this.joinType = JoinType.left});
 
   bool get isManyToMany =>
       type == RelationshipType.hasMany && throughContext != null;
 
+  String get joinTypeString => joinType.toString().replaceAll('JoinType.', '');
+
   FieldElement findLocalField(OrmBuildContext ctx) {
     return ctx.effectiveFields.firstWhere(
         (f) => ctx.buildContext.resolveFieldName(f.name) == localKey,

angel_orm_test/lib/src/models/book.dart

@@ -9,10 +9,10 @@ part 'book.g.dart';
 @serializable
 @orm
 class _Book extends Model {
-  @belongsTo
+  @BelongsTo(joinType: JoinType.inner)
   _Author author;
 
-  @BelongsTo(localKey: "partner_author_id")
+  @BelongsTo(localKey: "partner_author_id", joinType: JoinType.inner)
   _Author partnerAuthor;
 
   String name;