CheckColumns Constraint (#730)

* feat: add check columns class

* feat: write document of check columns part

* test: write a test for check columns constraints

* fix: debuging test exception raise mysql

* fix: set pragma no cover to ignore cov

* fix: ignore pytest raise in python 3.x not 10

* feat: set constraint name for check columns

* refactor: support index and check overwrites

* fix: debuging check constraint arguments

* fix: debug coverage all code tests

* fix: pass the map of type constraint to counter

* refactor: edit check name replace sapce underline

* refactor: write new function copy constraints

* test: write test for invalid constraint type

* fix: debug text cluase replaced names

* fix: set pragma no cover for result returned

* refactor: no coverage for main if statement

* perf: change get constraint copy func code

* fix: fix bug in mypy typing check

ormar/models/helpers/sqlalchemy.py

@@ -298,7 +298,7 @@ def populate_meta_sqlalchemy_table_if_required(meta: "ModelMeta") -> None:
 
 def set_constraint_names(meta: "ModelMeta") -> None:
     """
-    Populates the names on IndexColumn and UniqueColumns constraints.
+    Populates the names on IndexColumns and UniqueColumns and CheckColumns constraints.
 
     :param meta: Meta class of the Model without sqlalchemy table constructed
     :type meta: Model class Meta
@@ -317,6 +317,9 @@ def set_constraint_names(meta: "ModelMeta") -> None:
                 f"ix_{meta.tablename}_"
                 f'{"_".join([col for col in constraint._pending_colargs])}'
             )
+        elif isinstance(constraint, sqlalchemy.CheckConstraint) and not constraint.name:
+            sql_condition: str = str(constraint.sqltext).replace(" ", "_")
+            constraint.name = f"check_{meta.tablename}_{sql_condition}"
 
 
 def update_column_definition(