Changeset 5314 for main/waeup.sirp/branches

Timestamp:

26 Jul 2010, 12:33:05 (14 years ago)

Author:

uli

Message:

Add tests for date converter.

File:

• main/waeup.sirp/branches/ulif-fasttables/src/waeup/sirp/utils/converters.txt (modified) (3 diffs)

main/waeup.sirp/branches/ulif-fasttables/src/waeup/sirp/utils/converters.txt

@@ -267 +267 @@
        validation checks are disabled with this converter. This speeds
        up things as expensive lookups are avoided.
+
+
+:class:`DateConverter`
+----------------------
+
+.. autoclass:: waeup.sirp.utils.converters.DateConverter
+   :members:
+   :inherited-members:
 
 
@@ -682 +690 @@
 
 A more complex (but still realistic example) for conversion of
-:mode:`zope.schema.Choice` fields follows. Here we have a special kind
+:mod:`zope.schema.Choice` fields follows. Here we have a special kind
 of object, the `Cave` class, and get their `name` attribute as token.
 
@@ -739 +747 @@
     >>> converter.toString(obj2)
     'Fred'
+
+Date field converters
+---------------------
+
+We create a field that also implements ``IDate``, a regular
+``Date`` field:
+
+    >>> from zope.schema import Date
+    >>> from datetime import date
+    >>> field = Date(title=u'Some date',
+    ...             default=date(2010, 4, 1),
+    ...             required=True)
+
+Now we can get a converter for this field by explicitly creating a
+:class:`IntConverter` instance:
+
+    >>> from waeup.sirp.utils.converters import DateConverter
+    >>> converter = DateConverter(field)
+
+Or we can just grab a registered adapter:
+
+    >>> from waeup.sirp.interfaces import ISchemaTypeConverter
+    >>> converter = ISchemaTypeConverter(field)
+
+This will select the correct converter for us automatically.
+
+    >>> converter
+    <waeup.sirp.utils.converters.DateConverter object at 0x...>
+
+Now we can convert strings to this type:
+
+    >>> converter.fromString('2007-04-23')
+    datetime.date(2007, 4, 23)
+
+And back:
+
+    >>> converter.toString(date(2007,4,23))
+    '2007-04-23'
+
+As string input we also accept 'DD/MM/YYYY':
+
+    >>> converter.fromString('13/05/1945')
+    datetime.date(1945, 5, 13)
+
+and some more bizarre formats:
+
+    >>> converter.fromString('1945/05/13')
+    datetime.date(1945, 5, 13)
+
+    >>> converter.fromString('1945/05/13 12:12:34 GMT+1')
+    datetime.date(1945, 5, 13)
+
+    >>> converter.fromString('1945/5/6')
+    datetime.date(1945, 5, 6)
+
+    >>> converter.fromString('06.05.1945')
+    datetime.date(1945, 5, 6)
+
+    >>> converter.fromString('6.5.1945')
+    datetime.date(1945, 5, 6)
+
+while other date formats will mean trouble:
+
+    >>> converter.fromString('first of July 1960')
+    Traceback (most recent call last):
+    ...
+    ValueError: Cannot convert to date: first of July 1960. Use YYYY-MM-DD.
+
+Okay, not very surprising. But the field definitions can help also
+deliver values, if the given value is missing:
+
+    >>> converter.fromString(None)
+    datetime.date(2010, 4, 1)
+
+``None`` is not an acceptable value for fields which are required but
+provide no default:
+
+    >>> field = Date(title=u'Some Title',
+    ...             required=True)
+    >>> converter = ISchemaTypeConverter(field)
+    >>> converter.fromString(None)
+    Traceback (most recent call last):
+    ...
+    RequiredMissing
+
+If we want to avoid this type of exception (and risk non-applicable
+data to be stored), we can use the ``strict`` parameter of
+``fromString()``:
+
+    >>> converter.fromString(None, strict=False) is None
+    True
+
+The same for the inverse operation:
+
+    >>> converter.toString(None)
+    Traceback (most recent call last):
+    ...
+    RequiredMissing
+    >>> converter.toString(None, strict=False) is None
+    True
+
+
+If a field is not required, we will get the ``missing_value`` type in
+same case:
+
+    >>> field = Date(title=u'Some Title',
+    ...             required=False)
+    >>> converter = ISchemaTypeConverter(field)
+    >>> converter.fromString(None) is None
+    True
+
+    >>> converter.toString(None) is None
+    True