add comment function from field

pony/orm/core.py

@@ -2015,7 +2015,7 @@ class Attribute(object):
                 'lazy', 'lazy_sql_cache', 'args', 'auto', 'default', 'reverse', 'composite_keys', \
                 'column', 'columns', 'col_paths', '_columns_checked', 'converters', 'kwargs', \
                 'cascade_delete', 'index', 'reverse_index', 'original_default', 'sql_default', 'py_check', 'hidden', \
-                'optimistic', 'fk_name', 'type_has_empty_value', 'interleave'
+                'optimistic', 'fk_name', 'type_has_empty_value', 'interleave', 'comment'
     def __deepcopy__(attr, memo):
         return attr  # Attribute cannot be cloned by deepcopy()
     @cut_traceback
@@ -2046,6 +2046,7 @@ def __init__(attr, py_type, *args, **kwargs):
         attr.is_relation = isinstance(attr.py_type, (EntityMeta, str, types.FunctionType))
         attr.is_basic = not attr.is_collection and not attr.is_relation
         attr.sql_type = kwargs.pop('sql_type', None)
+        attr.comment = kwargs.pop('comment', None)
         attr.entity = attr.name = None
         attr.args = args
         attr.auto = kwargs.pop('auto', False)

pony/orm/dbapiprovider.py

@@ -459,6 +459,7 @@ def init(converter, kwargs):
         converter.max_len = max_len
         converter.db_encoding = kwargs.pop('db_encoding', None)
         converter.autostrip = kwargs.pop('autostrip', True)
+        converter.comment = kwargs.pop('comment', None)
     def validate(converter, val, obj=None):
         if not isinstance(val, str): throw(TypeError,
             'Value type for attribute %s must be str. Got: %r' % (converter.attr, type(val)))

pony/orm/dbschema.py

@@ -237,12 +237,21 @@ def add_default():
                 append(case('DEFAULT'))
                 append(column.sql_default)
 
+        def add_comment():
+            comment = column.converter.attr.comment
+            if comment != None:
+                append(case('COMMENT'))
+                append('\'%s\''%comment)            
+
         if column.is_pk == 'auto' and column.auto_template and column.converter.py_type in int_types:
             append(case(column.auto_template % dict(type=column.sql_type)))
             add_default()
+            add_comment()
         else:
             append(case(column.sql_type))
             add_default()
+            add_comment()
+
             if column.is_pk:
                 if schema.dialect == 'SQLite': append(case('NOT NULL'))
                 append(case('PRIMARY KEY'))