Provide some default readonly form field renderers

tailbone/forms2/core.py

@@ -286,7 +286,7 @@ class Form(object):
     """
 
     def __init__(self, fields=None, schema=None, request=None, readonly=False, readonly_fields=[],
-                 model_instance=None, model_class=None, nodes={}, enums={}, labels={}, renderers={},
+                 model_instance=None, model_class=None, nodes={}, enums={}, labels={}, renderers=None,
                  widgets={}, defaults={}, validators={}, required={}, helptext={},
                  action_url=None, cancel_url=None):
 
@@ -304,6 +304,9 @@ class Form(object):
         self.nodes = nodes or {}
         self.enums = enums or {}
         self.labels = labels or {}
+        if renderers is None and self.model_class:
+            self.renderers = self.make_renderers()
+        else:
             self.renderers = renderers or {}
         self.widgets = widgets or {}
         self.defaults = defaults or {}
@@ -334,6 +337,31 @@ class Form(object):
 
         return fields
 
+    def make_renderers(self):
+        """
+        Return a default set of field renderers, based on :attr:`model_class`.
+        """
+        if not self.model_class:
+            raise ValueError("Must define model_class to use make_renderers()")
+
+        mapper = orm.class_mapper(self.model_class)
+        renderers = {}
+
+        for field in self.fields:
+            if mapper.has_property(field):
+                prop = mapper.get_property(field)
+                if isinstance(prop, orm.ColumnProperty):
+                    if len(prop.columns) == 1:
+                        column = prop.columns[0]
+
+                        if isinstance(column.type, sa.DateTime):
+                            renderers[field] = self.render_datetime
+
+                        elif isinstance(column.type, sa.Boolean):
+                            renderers[field] = self.render_boolean
+
+        return renderers
+
     def append(self, field):
         self.fields.append(field)