From b99c37e3d0f451ab36ca77fc53ca09947faff112 Mon Sep 17 00:00:00 2001
From: Selim Belhaouane <selim.belhaouane@gmail.com>
Date: Thu, 8 Oct 2020 16:07:22 -0400
Subject: [PATCH] Fix #1770 (#1771)

---
 changes/1770-selimb.md               |  1 +
 pydantic/mypy.py                     |  2 +-
 tests/mypy/modules/plugin_success.py | 10 ++++++++++
 3 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 changes/1770-selimb.md

diff --git a/changes/1770-selimb.md b/changes/1770-selimb.md
new file mode 100644
index 0000000..bfd7284
--- /dev/null
+++ b/changes/1770-selimb.md
@@ -0,0 +1 @@
+Fix false positive from mypy plugin when a class nested within a `BaseModel` is named `Model`.
diff --git a/pydantic/mypy.py b/pydantic/mypy.py
index 4881d8d..18d7ef0 100644
--- a/pydantic/mypy.py
+++ b/pydantic/mypy.py
@@ -328,7 +328,7 @@ class PydanticModelTransformer:
         construct_arguments = [fields_set_argument] + construct_arguments
 
         obj_type = ctx.api.named_type('__builtins__.object')
-        self_tvar_name = 'Model'
+        self_tvar_name = '_PydanticBaseModel'  # Make sure it does not conflict with other names in the class
         tvar_fullname = ctx.cls.fullname + '.' + self_tvar_name
         tvd = TypeVarDef(self_tvar_name, tvar_fullname, -1, [], obj_type)
         self_tvar_expr = TypeVarExpr(self_tvar_name, tvar_fullname, [], obj_type)
diff --git a/tests/mypy/modules/plugin_success.py b/tests/mypy/modules/plugin_success.py
index 8b0c6af..af4b8e3 100644
--- a/tests/mypy/modules/plugin_success.py
+++ b/tests/mypy/modules/plugin_success.py
@@ -123,3 +123,13 @@ p = AddProject(name='x', slug='y', description='z')
 
 class TypeAliasAsAttribute(BaseModel):
     __type_alias_attribute__ = Union[str, bytes]
+
+
+class NestedModel(BaseModel):
+    class Model(BaseModel):
+        id: str
+
+    model: Model
+
+
+_ = NestedModel.Model