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Supermodel export/import of relation fields
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Basic setup

    >>> from zope.component import getUtility
    >>> from plone.schemaeditor.interfaces import IFieldFactory

-------------------------
RelationChoiceField Tests
-------------------------

Our factory utility should exist and show we're addable::

    >>> factory_utility = getUtility(IFieldFactory, name='z3c.relationfield.schema.RelationChoice')
    >>> factory_utility.available()
    True

Import
------

Load a schema with several variations on a relation choice field::

    >>> schema = """\
    ... <?xml version="1.0" encoding="UTF-8"?>
    ... <model xmlns="http://namespaces.plone.org/supermodel/schema">
    ...     <schema>
    ...       <field name="my_rc" type="z3c.relationfield.schema.RelationChoice">
    ...         <description>Test Field</description>
    ...         <title>My RC</title>
    ...         <portal_type>
    ...           <element>Folder</element>
    ...           <element>File</element>
    ...         </portal_type>
    ...       </field>
    ...       <field name="my_rc1" type="z3c.relationfield.schema.RelationChoice">
    ...         <description>Test Field</description>
    ...         <title>My RC 1</title>
    ...       </field>
    ...       <field name="my_rc2" type="z3c.relationfield.schema.RelationChoice">
    ...         <description>Test Field</description>
    ...         <title>My RC 2</title>
    ...         <portal_type>
    ...         </portal_type>
    ...       </field>
    ...     </schema>
    ... </model>
    ... """

    >>> from plone.supermodel import loadString
    >>> model = loadString(schema)
    >>> schema = model.schema

    >>> from zope.schema import getFieldNamesInOrder
    >>> getFieldNamesInOrder(schema)
    ['my_rc', 'my_rc1', 'my_rc2']

The first field has explicit portal types. Make sure it's using
ObjPathSourceBinder::

    >>> schema['my_rc'].source
    <plone.formwidget.contenttree.source.ObjPathSourceBinder object at ...>

The field factory for relation fields should tell us this is editable::

    >>> factory_utility.editable(schema['my_rc'])
    True

And, we should have our specified portal_type spec::

    >>> schema['my_rc'].source.selectable_filter.criteria.get('portal_type')
    [u'Folder', u'File']

The second test field has an empty portal_type stanza. It should look much
like the first example, but with no types.

    >>> schema['my_rc1'].source
    <plone.formwidget.contenttree.source.ObjPathSourceBinder object at ...>

    >>> factory_utility.editable(schema['my_rc1'])
    True

    >>> schema['my_rc1'].source.selectable_filter.criteria.get('portal_type') is None
    True

Same for the third, which has no portal_type stanza::

    >>> schema['my_rc2'].source
    <plone.formwidget.contenttree.source.ObjPathSourceBinder object at ...>

    >>> factory_utility.editable(schema['my_rc2'])
    True

    >>> schema['my_rc2'].source.selectable_filter.criteria.get('portal_type') is None
    True


Export
------

Test export by serializing out. Note that we lose the source detail on the
last field. That's because we are not supporting export of explicit sources.
Serialization::

    >>> from plone.supermodel import serializeModel
    >>> print serializeModel(model)
    <model ...>
      <schema>
        <field name="my_rc" type="z3c.relationfield.schema.RelationChoice">
          <description>Test Field</description>
          <title>My RC</title>
          <portal_type>
            <element>Folder</element>
            <element>File</element>
          </portal_type>
        </field>
        <field name="my_rc1" type="z3c.relationfield.schema.RelationChoice">
          <description>Test Field</description>
          <title>My RC 1</title>
        </field>
        <field name="my_rc2" type="z3c.relationfield.schema.RelationChoice">
          <description>Test Field</description>
          <title>My RC 2</title>
        </field>
      </schema>
    </model>


-------------------------
RelationListField Tests
-------------------------

Check availability for adding::

    >>> factory_utility = getUtility(IFieldFactory, name='z3c.relationfield.schema.RelationList')
    >>> factory_utility.available()
    True

Import
------

Nearly all the testing is already done in testing RelationChoice.
We just need to make sure it's handled in the value_type::

    >>> schema = """\
    ... <?xml version="1.0" encoding="UTF-8"?>
    ... <model xmlns="http://namespaces.plone.org/supermodel/schema">
    ...     <schema>
    ...         <field name="my_rl" type="z3c.relationfield.schema.RelationList">
    ...           <title>My RL</title>
    ...           <value_type type="z3c.relationfield.schema.RelationChoice">
    ...               <portal_type>
    ...                 <element>Folder</element>
    ...                 <element>File</element>
    ...               </portal_type>
    ...           </value_type>
    ...         </field>
    ...     </schema>
    ... </model>
    ... """

    >>> from plone.supermodel import loadString
    >>> model = loadString(schema)
    >>> schema = model.schema

    >>> from zope.schema import getFieldNamesInOrder
    >>> getFieldNamesInOrder(schema)
    ['my_rl']

    >>> schema['my_rl'].value_type.source.selectable_filter.criteria.get('portal_type')
    [u'Folder', u'File']

    >>> factory_utility.editable(schema['my_rl'])
    True

Export
------

    >>> from plone.supermodel import serializeModel
    >>> print serializeModel(model)
    <model ...>
      <schema>
        <field name="my_rl" type="z3c.relationfield.schema.RelationList">
          <title>My RL</title>
          <value_type type="z3c.relationfield.schema.RelationChoice">
            <portal_type>
              <element>Folder</element>
              <element>File</element>
            </portal_type>
          </value_type>
        </field>
      </schema>
    </model>