From 999332ef77196cdfedd7e1af03dc89010b5ec787 Mon Sep 17 00:00:00 2001
From: Eric Masseran <rico.masseran@gmail.com>
Date: Tue, 18 Mar 2025 00:30:50 +0100
Subject: [PATCH] Dataclass transform change init False

---
 jedi/inference/value/klass.py         | 25 ++++++++++++++++++++++++-
 jedi/plugins/stdlib.py                | 12 ++++++++++--
 test/test_inference/test_signature.py | 27 +++++++++++++++++++++++++++
 3 files changed, 61 insertions(+), 3 deletions(-)

diff --git a/jedi/inference/value/klass.py b/jedi/inference/value/klass.py
index e6750614..7158eee4 100644
--- a/jedi/inference/value/klass.py
+++ b/jedi/inference/value/klass.py
@@ -296,7 +296,9 @@ class ClassMixin:
                 continue
 
             # All inherited behave like dataclass
-            if is_dataclass_transform_with_init:
+            if is_dataclass_transform_with_init and (
+                isinstance(cls, ClassValue) and not cls._has_init_false()
+            ):
                 param_names.extend(
                     get_dataclass_param_names(cls)
                 )
@@ -557,6 +559,27 @@ class ClassValue(ClassMixin, FunctionAndClassBase, metaclass=CachedMetaClass):
                         return values
         return NO_VALUES
 
+    def _has_init_false(self) -> bool:
+        """
+        It returns ``True`` if ``class X(init=False):`` else ``False``.
+        """
+        bases_arguments = self._get_bases_arguments()
+
+        if bases_arguments.argument_node.type != "arglist":
+            # If it is not inheriting from the base model and having
+            # extra parameters, then init behavior is not changed.
+            return False
+
+        for arg in bases_arguments.argument_node.children:
+            if (
+                arg.type == "argument"
+                and arg.children[0].value == "init"
+                and arg.children[2].value == "False"
+            ):
+                return True
+
+        return False
+
     @plugin_manager.decorate()
     def get_metaclass_signatures(self, metaclasses):
         return []
diff --git a/jedi/plugins/stdlib.py b/jedi/plugins/stdlib.py
index 491a3b61..618965ca 100644
--- a/jedi/plugins/stdlib.py
+++ b/jedi/plugins/stdlib.py
@@ -625,9 +625,17 @@ def _dataclass(value, arguments, callback):
                 ]
             )
         elif c.is_function():
-            # dataclass_transform on a decorator equivalent of @dataclass
+            # @dataclass_transform
+            # def create_model(): pass
             return ValueSet([value])
-        elif value.name.string_name != "dataclass_transform":
+        elif (
+            # @dataclass(...)
+            value.name.string_name != "dataclass_transform"
+            # @dataclass_transform
+            # def create_model(): pass
+            # @create_model(...)
+            or isinstance(value, Decoratee)
+        ):
             # dataclass (or like) decorator customization
             return ValueSet(
                 [
diff --git a/test/test_inference/test_signature.py b/test/test_inference/test_signature.py
index 47c9f032..b31b277d 100644
--- a/test/test_inference/test_signature.py
+++ b/test/test_inference/test_signature.py
@@ -482,6 +482,30 @@ dataclass_transform_cases = [
         def __init__(self, toto: str):
             pass
         '''), ["toto"], False],
+    # Class based init=false
+    [dedent('''
+        @dataclass_transform
+        class Y():
+            y: int
+            z = 5
+        class X(Y, init=False):'''), [], False],
+    # Decorator based init=false
+    [dedent('''
+        @dataclass_transform
+        def create_model():
+            pass
+        @create_model(init=False)
+        class X:'''), [], False],
+    # Metaclass based init=false
+    [dedent('''
+        @dataclass_transform
+        class ModelMeta():
+            y: int
+            z = 5
+        class ModelBase(metaclass=ModelMeta):
+            t: int
+            p = 5
+        class X(ModelBase, init=False):'''), [], False],
 ]
 
 ids = [
@@ -493,6 +517,9 @@ ids = [
     "decorator_transformed",
     "metaclass_transformed",
     "custom_init",
+    "base_transformed_init_false",
+    "decorator_transformed_init_false",
+    "metaclass_transformed_init_false",
 ]