From 6cf72d26b56fc09384960aa2e4ef177f8e3b652f Mon Sep 17 00:00:00 2001
From: sergey <sergey@sm8255082.ru>
Date: Thu, 11 Jul 2024 21:26:30 +0300
Subject: [PATCH] =?UTF-8?q?=D0=B4=D0=BE=D0=B1=D0=B0=D0=B2=D0=BB=D0=B5?=
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---
 sipi-app/core/models/__init__.py |  4 +++-
 sipi-app/core/models/base.py     | 14 ++++++++++++++
 sipi-app/main.py                 |  1 +
 sipi-app/utils/__init__.py       |  5 +++++
 sipi-app/utils/case_converter.py | 29 +++++++++++++++++++++++++++++
 5 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100644 sipi-app/core/models/base.py
 create mode 100644 sipi-app/utils/__init__.py
 create mode 100644 sipi-app/utils/case_converter.py

diff --git a/sipi-app/core/models/__init__.py b/sipi-app/core/models/__init__.py
index 59f11d9..5ba00c7 100644
--- a/sipi-app/core/models/__init__.py
+++ b/sipi-app/core/models/__init__.py
@@ -1,5 +1,7 @@
 __all__ = (
-    'db_helper'
+    'db_helper',
+    'Base'
 )
 
 from .db_helper import db_helper
+from .base import Base
\ No newline at end of file
diff --git a/sipi-app/core/models/base.py b/sipi-app/core/models/base.py
new file mode 100644
index 0000000..7611949
--- /dev/null
+++ b/sipi-app/core/models/base.py
@@ -0,0 +1,14 @@
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, declared_attr
+
+from utils import camel_case_to_snake_case
+
+
+
+class Base(DeclarativeBase):
+    __abstract__ = True
+
+    @declared_attr.directive
+    def __tablename__(cls) -> str:
+        return f'{camel_case_to_snake_case(cls.__name__)}s'
+
+    id: Mapped[int] = mapped_column(primary_key=True)
\ No newline at end of file
diff --git a/sipi-app/main.py b/sipi-app/main.py
index b677f2c..7f8522c 100644
--- a/sipi-app/main.py
+++ b/sipi-app/main.py
@@ -16,6 +16,7 @@ async def lifespan(app: FastAPI):
 main_app = FastAPI(
     lifespan=lifespan,
 )
+
 main_app.include_router(api_router,
                    prefix=settings.api.prefix)
 
diff --git a/sipi-app/utils/__init__.py b/sipi-app/utils/__init__.py
new file mode 100644
index 0000000..72b34ef
--- /dev/null
+++ b/sipi-app/utils/__init__.py
@@ -0,0 +1,5 @@
+__all__ = (
+    'camel_case_to_snake_case',
+)
+
+from .case_converter import camel_case_to_snake_case
diff --git a/sipi-app/utils/case_converter.py b/sipi-app/utils/case_converter.py
new file mode 100644
index 0000000..203e9a8
--- /dev/null
+++ b/sipi-app/utils/case_converter.py
@@ -0,0 +1,29 @@
+"""
+Taken from
+https://github.com/mahenzon/ri-sdk-python-wrapper/blob/master/ri_sdk_codegen/utils/case_converter.py
+"""
+
+
+def camel_case_to_snake_case(input_str: str) -> str:
+    """
+    >>> camel_case_to_snake_case("SomeSDK")
+    'some_sdk'
+    >>> camel_case_to_snake_case("RServoDrive")
+    'r_servo_drive'
+    >>> camel_case_to_snake_case("SDKDemo")
+    'sdk_demo'
+    """
+    chars = []
+    for c_idx, char in enumerate(input_str):
+        if c_idx and char.isupper():
+            nxt_idx = c_idx + 1
+            # idea of the flag is to separate abbreviations
+            # as new words, show them in lower case
+            flag = nxt_idx >= len(input_str) or input_str[nxt_idx].isupper()
+            prev_char = input_str[c_idx - 1]
+            if prev_char.isupper() and flag:
+                pass
+            else:
+                chars.append("_")
+        chars.append(char.lower())
+    return "".join(chars)