provide preset concept lists (via type option qualifier:assign) for create and edit dialog

git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@1616 fd906abe-77d9-0310-91a1-e0d9ade77398

README.txt

@@ -608,6 +608,45 @@ Creating an object
   >>> from loops.browser.form import CreateObjectForm, CreateObject
   >>> form = CreateObjectForm(m112, TestRequest())
 
+The form provides a set of data entry fields derived from the interface
+associated with the new object's resource (or concept) type.
+
+In addition it allows to assign concepts as parents to the object. Beside
+an integrated free search for concepts to assign there may be a list of
+preset concepts, e.g. depending on the target of the current node:
+
+  >>> form.assignments
+  ()
+  >>> m112.target = cc1
+  >>> form = CreateObjectForm(m112, TestRequest())
+  >>> form.assignments
+  (<...ConceptRelationView object ...>,)
+
+There also may be preset concept types that directly provide lists of
+concepts to select from.
+
+To show this let's start with a new type, the customer type.
+
+  >>> customer = concepts['customer'] = Concept('Customer')
+  >>> customer.conceptType = concepts.getTypeConcept()
+  >>> from loops.type import ConceptType, TypeConcept
+  >>> custType = TypeConcept(customer)
+  >>> custType.options
+  []
+  >>> cust1 = concepts['cust1'] = Concept(u'Zope Corporation')
+  >>> cust2 = concepts['cust2'] = Concept(u'cyberconcepts')
+  >>> for c in (cust1, cust2): c.conceptType = customer
+  >>> custType.options = ('qualifier:assign',)
+  >>> ConceptType(cust1).qualifiers
+  ('concept', 'assign')
+
+  >>> form = CreateObjectForm(m112, TestRequest())
+  >>> form.presetTypesForAssignment
+  [{'token': 'loops:concept:customer', 'title': 'Customer'}]
+
+OK, so much about the form - now we want to create a new object based
+on data provided in this form:
+
   >>> from loops.interfaces import INote, ITypeConcept
   >>> from loops.type import TypeConcept
   >>> from loops.resource import NoteAdapter
@@ -708,7 +747,7 @@ target object's view here:
   [<loops.browser.common.Action object ...>]
   >>> action = view.virtualTarget.getActions()[0]
   >>> action.url
-  'http://127.0.0.1/loops/views/m1/m11/m111/.target16'
+  'http://127.0.0.1/loops/views/m1/m11/m111/.target19'
 
 
 Import/Export

browser/form.py

@@ -40,12 +40,13 @@ from zope.security.proxy import isinstance
 
 from cybertools.ajax import innerHtml
 from cybertools.browser.form import FormController
-from cybertools.typology.interfaces import IType
+from cybertools.typology.interfaces import IType, ITypeManager
 from loops.concept import ResourceRelation
 from loops.interfaces import IConcept, IResourceManager, IDocument
 from loops.interfaces import IFile, IExternalFile, INote
 from loops.browser.node import NodeView
 from loops.browser.concept import ConceptRelationView
+from loops.query import ConceptQuery
 from loops.resource import Resource
 from loops.type import ITypeConcept
 from loops import util
@@ -98,8 +99,27 @@ class ObjectForm(NodeView):
 
     @Lazy
     def defaultPredicate(self):
-        return util.getUidForObject(
-                self.loopsRoot.getConceptManager().getDefaultPredicate())
+        return self.loopsRoot.getConceptManager().getDefaultPredicate()
+
+    @Lazy
+    def typeManager(self):
+        return ITypeManager(self.context)
+
+    @Lazy
+    def presetTypesForAssignment(self):
+        types = list(self.typeManager.listTypes(include=('assign',)))
+        assigned = [r.context.conceptType for r in self.assignments]
+        types = [t for t in types if t.typeProvider not in assigned]
+        return [dict(title=t.title, token=t.tokenForSearch) for t in types]
+
+    def conceptsForType(self, token):
+        noSelection = dict(token='none', title=u'not selected')
+        result = sorted(ConceptQuery(self).query(type=token), key=lambda x: x.title)
+        predicateUid = util.getUidForObject(self.defaultPredicate)
+        return ([noSelection] +
+                [dict(title=o.title,
+                      token='%s:%s' % (util.getUidForObject(o), predicateUid))
+                 for o in result])
 
 
 class WidgetController(object):
@@ -241,6 +261,9 @@ class EditObject(FormController):
                 if fn.startswith(self.conceptPrefix) and value:
                     self.collectConcepts(fn[len(self.conceptPrefix):], value)
                 else:
+                    if not value and fn == 'data' and IFile.providedBy(adapted):
+                        # empty file data - don' change
+                        continue
                     if isinstance(value, FileUpload):
                         filename = getattr(value, 'filename', '')
                         value = value.read()
@@ -273,7 +296,7 @@ class EditObject(FormController):
                 predicate = util.getObjectForUid(p)
                 obj.deassignConcept(concept, [predicate])
         for v in self.selected:
-            if v not in self.old:
+            if v != 'none' and v not in self.old:
                 c, p = v.split(':')
                 concept = util.getObjectForUid(c)
                 predicate = util.getObjectForUid(p)

browser/form_macros.pt

@@ -105,6 +105,19 @@
 
 <metal:assignments define-macro="assignments">
     <tbody id="form.assignments">
+      <tr tal:repeat="type view/presetTypesForAssignment">
+        <td><span i18n:translate="">Type: </span></td>
+        <td><b tal:content="type/title" /></td>
+        <td><span i18n:translate="">Select value: </span></td>
+        <td colspan="2">
+          <select name="form.assignments.selected:list">
+            <tal:concepts repeat="concept python: view.conceptsForType(type['token'])">
+              <option tal:attributes="value concept/token"
+                      tal:content="concept/title">Zope Corp</option>
+            </tal:concepts>
+          </select>
+        </td>
+      </tr>
       <tr tal:repeat="relation view/assignments">
         <td colspan="5">
           <input type="hidden" name="form.assignments.old:list"