Changeset 4817 for waeup/branches/ulif-importers

Timestamp:

15 Jan 2010, 12:02:14 (15 years ago)

Author:

uli

Message:

Add tests for BoolConverter?.

File:

• waeup/branches/ulif-importers/src/waeup/utils/converters.txt (modified) (2 diffs)

waeup/branches/ulif-importers/src/waeup/utils/converters.txt

@@ -294 +294 @@
     True
 
+Bool field converters
+---------------------
+
+We create a field that also implements ``IBool``, a regular
+``Bool`` field:
+
+    >>> from zope.schema import Bool
+    >>> field = Bool(title=u'Some truth',
+    ...             default=True,
+    ...             required=True)
+
+Now we can get a converter for this field by explicitly creating a
+:class:`BoolConverter` instance:
+
+    >>> from waeup.utils.converters import BoolConverter
+    >>> converter = BoolConverter(field)
+
+Or we can just grab a registered adapter:
+
+    >>> from waeup.interfaces import ISchemaTypeConverter
+    >>> converter = ISchemaTypeConverter(field)
+
+This will select the correct converter for us automatically.
+
+    >>> converter
+    <waeup.utils.converters.BoolConverter object at 0x...>
+
+Now we can convert strings to this type:
+
+    >>> converter.fromString('yes')
+    True
+
+    >>> converter.fromString('Yes')
+    True
+
+    >>> converter.fromString('yEs')
+    True
+
+    >>> converter.fromString('1')
+    True
+
+    >>> converter.fromString('True')
+    True
+
+    >>> converter.fromString('0')
+    False
+
+    >>> converter.fromString('no')
+    False
+
+    >>> converter.fromString('false')
+    False
+
+
+And back:
+
+    >>> converter.toString(True)
+    '1'
+
+    >>> converter.toString(False)
+    '0'
+
+Okay, not very surprising. But the field definitions can help also
+deliver values, if the given value is missing:
+
+    >>> converter.fromString(None)
+    True
+
+``None`` is not an acceptable value for fields which are required but
+provide no default:
+
+    >>> field = Bool(title=u'Some Truth',
+    ...             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 = Bool(title=u'Some Title',
+    ...             required=False)
+
+    >>> converter = ISchemaTypeConverter(field)
+    >>> converter.fromString(None) is None
+    True
+
+    >>> converter.toString(None) is None
+    True
+
 
 Int field converters
@@ -307 +418 @@
 
 Now we can get a converter for this field by explicitly creating a
-:class:`TextConverter` instance:
+:class:`IntConverter` instance:
 
     >>> from waeup.utils.converters import IntConverter