formdata: add live view of item field linked card data (#45094)

tests/test_formdata.py

@@ -16,6 +16,7 @@ from wcs.qommon.form import PicklableUpload
 from wcs.qommon.http_request import HTTPRequest
 from wcs import fields, formdef
 from wcs.blocks import BlockDef
+from wcs.carddef import CardDef
 from wcs.categories import Category
 from wcs.conditions import Condition
 from wcs.formdef import FormDef
@@ -783,6 +784,52 @@ def test_lazy_formdata_duplicated_varname(pub, variable_test_data):
     assert lazy_formdata.var.foo_foo == 'baz'  # 2nd value
 
 
+def test_lazy_formdata_live_item(pub):
+    CardDef.wipe()
+    carddef = CardDef()
+    carddef.name = 'items'
+    carddef.digest_template = '{{form_var_name}}'
+    carddef.fields = [
+        fields.StringField(id='0', label='string', varname='name'),
+        fields.StringField(id='1', label='string', varname='attr'),
+    ]
+    carddef.store()
+    for i, value in enumerate(['foo', 'bar', 'baz']):
+        carddata = carddef.data_class()()
+        carddata.data = {
+            '0': value,
+            '1': 'attr%s' % i,
+        }
+        carddata.just_created()
+        carddata.store()
+
+    ds = {'type': 'carddef:%s' % carddef.url_name}
+    formdef = FormDef()
+    formdef.name = 'foobar'
+    formdef.fields = [fields.ItemField(id='0', label='string', type='item',
+        varname='foo', data_source=ds, display_disabled_items=True)]
+    formdef.store()
+
+    formdata = formdef.data_class()()
+    formdata.data = {
+        '0': str(carddata.id),
+    }
+    pub.substitutions.feed(pub)
+    pub.substitutions.feed(formdef)
+    pub.substitutions.feed(formdata)
+
+    context = pub.substitutions.get_context_variables(mode='lazy')
+    assert context['form_var_foo_live_name'] == 'items'
+    assert context['form_var_foo_live_number'] == carddata.get_display_id()
+    assert context['form_var_foo_live_var_name'] == 'baz'
+    assert context['form_var_foo_live_var_attr'] == 'attr2'
+
+    CardDef.wipe()
+    context = pub.substitutions.get_context_variables(mode='lazy')
+    with pytest.raises(KeyError):
+        context['form_var_foo_live_name']
+
+
 def test_lazy_formdata_queryset(pub, variable_test_data):
     lazy_formdata = variable_test_data
     data_class = lazy_formdata._formdef.data_class()

wcs/variables.py

@@ -642,6 +642,8 @@ class LazyFieldVarStructured(LazyFieldVar):
             return ['raw']
 
         keys = ['raw', 'structured']
+        if self._field.data_source and self._field.data_source.get('type', '').startswith('carddef:'):
+            keys.append('live')
 
         def walk(base, value):
             if isinstance(value, dict):
@@ -667,6 +669,18 @@ class LazyFieldVarStructured(LazyFieldVar):
     def structured(self):
         return self._field.get_structured_value(self._data)
 
+    @property
+    def live(self):
+        if not (self._field.data_source and self._field.data_source.get('type', '').startswith('carddef:')):
+            raise AttributeError('live')
+        from wcs.carddef import CardDef
+        try:
+            carddef = CardDef.get_by_urlname(self._field.data_source['type'][8:])
+            carddata = carddef.data_class().get(self.raw)
+        except KeyError:
+            raise AttributeError('live')
+        return LazyFormData(carddata)
+
     def __getitem__(self, key):
         try:
             return super(LazyFieldVarStructured, self).__getitem__(key)