This document discusses filtering data in Direct to Web (D2W) by limiting the visibility of data based on the current user or company. It presents two solutions: 1. Modifying fetch specifications at the editing context level to add relationship qualifiers restricting results to the current company. This works but is low-level. 2. Using query and relationship components in D2W that call business logic to generate the appropriate qualifiers and restricted data sources. This provides a cleaner, more reusable approach compared to the first solution. The document also discusses enhancing relationship components to support restricting fetch specifications to simplify generating qualifiers across different entities and relationships. In summary, it focuses on programmatically filtering data in D2

1. Filtering data with D2W
Philippe Rabier - twitter.com/prabier
Sophiacom

2. What is the problem to solve?

3. Company
EOEntityA
EOEntityB
User
EOEntityC

4. • Use D2W
• Limit the visibility of the data
• Use conventions to name relationships (for example, any toOne
relationship to Company entity, is called company)
• Minimize the code
• Be magic!
The Requirements

5. Feedback fromYou ’N Push

6. First Solution
Working at the editingContext level

7. modified fetchspec
notification
ec factory
ec
company
objectsWithFetch
Specification()
creates
businessFP
fetchspec

8. How the qualifier is modified?
public void alterFetchSpecification(final NSNotification aNotification)
{
EOEditingContext ec = (EOEditingContext) aNotification.object();
if (shouldAddRestrictionQualifier)
{
Company aCompany = (NOClient) ec.userInfoForKey(NBEditingContextFactory.COMPANY_KEY);
final EOFetchSpecification fs = (EOFetchSpecification) aNotification.userInfo().valueForKey(COEditingContext.FETCH_SPEC_KEY);
if (aCompany != null && fs != null)
{
EOEntity aEntity = EOUtilities.entityNamed(ec, fs.entityName());
EOQualifier fsQualifier = fs.qualifier();
if (fsQualifier != null)
{
NSSet<String> keys = fsQualifier.allQualifierKeys();
for (String aKey : keys)
{
if (aKey.contains("company"))
{
shouldAddRestrictionQualifier = false;
break;
}
}
}
if (shouldAddRestrictionQualifier)
{
EOQualifier aRestrictionQualifier = clientRestrictionQualifier(aEntity, aClient);
if (aRestrictionQualifier != null)
{
if (fsQualifier != null)
fsQualifier = new EOAndQualifier(new NSArray<EOQualifier>(new EOQualifier[] {fsQualifier, aRestrictionQualifier}));
else
fsQualifier = aRestrictionQualifier;
fs.setQualifier(fsQualifier);
}
}
}
}
}

9. How the qualifier is modified?
public EOQualifier companyRestrictionQualifier(final EOEntity entity, final Company company)
{
EOQualifier aQualifier = null;
if (entity.name().equals(Company.Keys.ENTITY_NAME))
aQualifier = new EOKeyValueQualifier(Company.Keys.NAME, EOQualifier.QualifierOperatorEqual, company.name());
else if (entity.relationshipNamed("company") != null)
aQualifier = new EOKeyValueQualifier("company", EOQualifier.QualifierOperatorEqual, company);
else if (entity.relationshipNamed("entityB") != null)
aQualifier = new EOKeyValueQualifier("entityB.company", EOQualifier.QualifierOperatorEqual, client);
else if (entity.relationshipNamed("entityC") != null)
...;
if (log.isDebugEnabled())
log.debug("method: qualifier: " + aQualifier);
return aQualifier;
}

10. It works great
but there is a little problem
it’s too low level

11. An Example of Problem
public void validateForSave() throws ValidationException
{
super.validateForSave();
ERXEOControlUtilities.validateUniquenessOf(this, NOUser.Keys.LOGIN);
ERXEOControlUtilities.validateUniquenessOf(this, NOUser.Keys.EMAIL);
}
public void validateForSave() throws ValidationException
{
super.validateForSave();
editingContext().setUserInfoForKey(Boolean.FALSE, NBEditingContextFactory.NO_RESTRICTION_QUAL_KEY);
ERXEOControlUtilities.validateUniquenessOf(this, NOUser.Keys.LOGIN);
ERXEOControlUtilities.validateUniquenessOf(this, NOUser.Keys.EMAIL);
editingContext().setUserInfoForKey(Boolean.TRUE, NBEditingContextFactory.NO_RESTRICTION_QUAL_KEY);
}

12. Second Solution

13. • Displaying a list
• Using a query component
• Using ERD2WEditToManyRelationship component
• Using ERD2WEditToOneRelationship component
When should we filter?

14. • Modify the NavigationController object
• Change the data source
Displaying a list
public WOComponent listPageForEntityName(final String entityName)
{
ListPageInterface newListPageInterface = D2W.factory().listPageForEntityNamed(entityName, session());
EODatabaseDataSource dataSource = new EODatabaseDataSource(ERXEC.newEditingContext(), entityName);
EOEntity entity = ERXEOAccessUtilities.entityNamed(null, entityName);
EOQualifier auxQual = NBBusinessLogicPrincipal.getSharedInstance().clientRestrictionQualifier(entity,
((Session)session()).getCompany());
dataSource.setAuxiliaryQualifier(auxQual);
newListPageInterface.setDataSource(dataSource);
return (WOComponent) newListPageInterface;
}

15. • Use a query delegate
• Override the method queryDataSource(ERD2WQueryPage sender)
Using a query component
{
author = 100;
class = "com.webobjects.directtoweb.Rule";
lhs = {
class = "com.webobjects.eocontrol.EOKeyValueQualifier";
key = pageConfiguration;
selectorName = isEqualTo;
value = QueryMyEntity;
};
rhs = {
class = "er.directtoweb.ERDDelayedObjectCreationAssignment";
keyPath = queryDataSourceDelegate;
value = "ca.wowodc.very.util.pascal.delegate.SomeOneElse";
};
}

16. • Maybe subclass the 2 component is the best solution
• Use restrictingFetchSpecification key. If all fetchspec have the
same name, it’s possible to build a generic rule.
• Need to be modified to add the possibility to set a binding to
the fetchspec
• Maybe a lot of pain to create many fetchspec in the EOModel
EditRelationship components

17. How the qualifier is modified?
public Object restrictedChoiceList() {
String restrictedChoiceKey=(String)d2wContext().valueForKey("restrictedChoiceKey");
if( restrictedChoiceKey!=null && restrictedChoiceKey.length()>0 )
return valueForKeyPath(restrictedChoiceKey);
String fetchSpecName=(String)d2wContext().valueForKey("restrictingFetchSpecification");
if(fetchSpecName != null) {
EORelationship relationship = ERXUtilities.relationshipWithObjectAndKeyPath(object(),
(String)d2wContext().valueForKey("propertyKey"));
if(relationship != null)
return EOUtilities.objectsWithFetchSpecificationAndBindings(object().editingContext(),
relationship.destinationEntity().name(),fetchSpecName,null);
}
return null;
}

18. @prabier
Follow me!

19. Q&A
TBD