Metadata for compatible SQLAlchemy version

Author: dahlia

docs/changes.rst

@@ -26,6 +26,8 @@ To be released.
   :meth:`~sqlalchemy_imageattach.entity.BaseImageSet.from_blob()` can take
   ``extra_args``/``extra_kwargs`` to be passed to entity model's constructor.
   [:issue:`32`, :issue:`33` by Vahid]
+- Added :const:`sqlalchemy_imageattach.version.SQLA_COMPAT_VERSION` and
+  :const:`sqlalchemy_imageattach.version.SQLA_COMPAT_VERSION_INFO` constants.
 
 
 Version 0.9.0

sqlalchemy_imageattach/version.py

@@ -4,12 +4,28 @@
 """
 from __future__ import print_function
 
+__all__ = ('SQLA_COMPAT_VERSION', 'SQLA_COMPAT_VERSION_INFO',
+           'VERSION', 'VERSION_INFO')
+
+
 #: (:class:`tuple`) The triple of version numbers e.g. ``(1, 2, 3)``.
-VERSION_INFO = (0, 9, 0)
+VERSION_INFO = (1, 0, 0)
 
 #: (:class:`str`) The version string e.g. ``'1.2.3'``.
 VERSION = '{0}.{1}.{2}'.format(*VERSION_INFO)
 
+#: (:class:`tuple`) The triple of minimum compatible SQLAlchemy version
+#: e.g. ``(0, 8, 0)``.
+#:
+#: .. versionadded:: 1.0.0
+SQLA_COMPAT_VERSION_INFO = (0, 8, 0)
+
+#: (:class:`str`) The minimum compatible SQLAlchemy version string
+#: e.g. ``'0.8.0'``.
+#:
+#: .. versionadded:: 1.0.0
+SQLA_COMPAT_VERSION = '{0}.{1}.{2}'.format(*SQLA_COMPAT_VERSION_INFO)
+
 
 if __name__ == '__main__':
     print(VERSION)

tests/version_test.py

@@ -3,7 +3,9 @@
 import os
 
 from sqlalchemy import __version__
-from sqlalchemy_imageattach.version import VERSION, VERSION_INFO
+from sqlalchemy_imageattach.version import (SQLA_COMPAT_VERSION,
+                                            SQLA_COMPAT_VERSION_INFO,
+                                            VERSION, VERSION_INFO)
 
 
 def test_version_info():
@@ -15,9 +17,14 @@ def test_version_info():
 
 
 def test_sqlalchemy_version():
-    sqla_version_info = list(map(int, __version__.split('.')[:2]))
-    assert sqla_version_info >= list(VERSION_INFO[:2])
-    assert __version__.split('.')[:2] >= VERSION.split('.')[:2]
+    def parse_int(s):
+        try:
+            return int(s)
+        except ValueError:
+            return -1
+    sqla_version_info = tuple(map(parse_int, __version__.split('.')[:3]))
+    assert sqla_version_info >= SQLA_COMPAT_VERSION_INFO
+    assert __version__.split('.')[:3] >= SQLA_COMPAT_VERSION.split('.')[:2]
 
 
 def test_version():