Added models and views

ref-test/app/tools/forms.py

@@ -0,0 +1,36 @@
+
+from ..modules import db
+
+from wtforms.validators import ValidationError
+
+import json
+from sqlalchemy.ext import mutable
+
+class JsonEncodedDict(db.TypeDecorator):
+    """Enables JSON storage by encoding and decoding on the fly."""
+    impl = db.Text
+
+    def process_bind_param(self, value, dialect):
+        if value is None:
+            return '{}'
+        else:
+            return json.dumps(value)
+
+    def process_result_value(self, value, dialect):
+        if value is None:
+            return {}
+        else:
+            return json.loads(value)
+
+mutable.MutableDict.associate_with(JsonEncodedDict)
+
+def value(min:int=0, max:int=None):
+    if not max:
+        message = f'Value must be greater than {min}.'
+    else:
+        message = f'Value must be between {min} and {max}.'
+    def length(form, field):
+        value = field.data or 0
+        if value < min or max != None and value > max:
+            raise ValidationError(message)
+    return length