Examples of er.extensions.eof.ERXKeyFilter

er.extensions.eof.ERXKeyFilter
ERXKeyFilter provides a way to specify hierarchical rules for including and excluding ERXKeys. This is useful if you need to perform operations on a set of EO's and optional relationships and attributes within those EO's. As an example, ERXRest uses ERXKeyFilter to programmatically specify which attributes and relationships will be rendered for a particular root EO.

ERXKeyFilter is a hierarchical mapping between ERXKeys (single key, not keypaths), whether an include or exclude rule should be applied for that key, and if it's an include, the next set of filter rules to apply to the destination object.
```
 ERXKeyFilter companyFilter = ERXKeyFilter.filterWithAttribtues(); ERXKeyFilter remindersFilter = companyFilter.include(Company.REMINDERS); remindersFilter.include(Reminder.SUMMARY); ERXKeyFilter reminderAuthorFilter = remindersFilter.include(Reminder.AUTHOR); reminderAuthorFilter.includeAll(); reminderAuthorFilter.exclude(Author.HUGE_RELATIONSHIP); 
```
For keys representing to-many relationships you can set a distinct flag if you want to filter that relationship to return only distinct objects. For this you can either pass in a key with the unique operator of ERXArrayUtilities or explicitly set the flag:
```
 ERXKeyFilter companyFilter = ERXKeyFilter.filterWithAttribtues(); companyFilter.include(ERXKey.unique(Company.EMPLOYEES)); companyFilter.include(Company.CLIENTS).setDistinct(true); 
```
more method comments to come ... @author mschrag

  public CompanyController(WORequest request) {
    super(request);
  }


  public static ERXKeyFilter queryFilter() {
    ERXKeyFilter filter = ERXKeyFilter.filterWithAllRecursive();
    return filter;
  }

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    ERXKeyFilter filter = ERXKeyFilter.filterWithAllRecursive();
    return filter;
  }


  public static ERXKeyFilter showFilter() {
    ERXKeyFilter filter = ERXKeyFilter.filterWithAttributes();
    return filter;
  }

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    ERXKeyFilter filter = ERXKeyFilter.filterWithAttributes();
    return filter;
  }


  public static ERXKeyFilter updateFilter() {
    ERXKeyFilter filter = ERXKeyFilter.filterWithAttributes();
    return filter;
  }

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   * @return
   */
  @GET
  @Path("/company/{company:Company}/employees")
  public WOActionResults employeesAction(@PathParam("company") Company company) {
    ERXKeyFilter personFilter = PersonController.showFilter();
    personFilter.exclude(Person.COMPANY);
    personFilter.include(Person.PETS).includeNone();
    return response(company.employees(), personFilter);
  }

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  }


  @Override
  public WOActionResults createAction() throws Throwable {
    checkPassword();
    ERXKeyFilter filter = ERXKeyFilter.filterWithAttributes();
    MApplication application = create(filter);
    siteConfig().addApplication_M(application);
    if (siteConfig().hostArray().count() != 0) {
      handler().sendAddApplicationToWotaskds(application, siteConfig().hostArray());
    }

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    ERXRestRequestNode toManyRelationshipNode = new ERXRestRequestNode(keyFilter.keyMap(key).key(), false);
    toManyRelationshipNode.setArray(true);
    toManyRelationshipNode.setType(destinationEntity.entityName());


    List childrenObjects = (List) key.valueInObject(obj);
    ERXKeyFilter childFilter = keyFilter._filterForKey(key);
    if (childFilter.isDistinct()) {
      if (childrenObjects instanceof NSArray) {
        childrenObjects = ERXArrayUtilities.distinct((NSArray<?>) childrenObjects);
      } else {
        childrenObjects = new ArrayList(new HashSet(childrenObjects));
      }
    }
        NSArray<EOSortOrdering> sortOrderings = childFilter.sortOrderings();
        if (sortOrderings != null && sortOrderings.count() > 0) {
                if (childrenObjects instanceof NSArray) {
                        childrenObjects = EOSortOrdering.sortedArrayUsingKeyOrderArray((NSArray<?>)childrenObjects, sortOrderings);
                }
                else {

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            }
          }
          else {
            Object id = childNode.id();


            ERXKeyFilter childKeyFilter = keyFilter._filterForKey(key);
            Object childObj;


            if (childNode.type() != null) {
              destinationClassDescription = ERXRestClassDescriptionFactory.classDescriptionForEntityName(childNode.type());
            }


            if (id == null) {
              if (lockedRelationship) {
                childObj = null;
              }
              else if (childKeyFilter.isAnonymousUpdateEnabled()) {
                childObj = NSKeyValueCoding.DefaultImplementation.valueForKey(obj, keyName);
                if (childObj == null) {
                  childObj = IERXRestDelegate.Factory.delegateForClassDescription(destinationClassDescription).createObjectOfEntityWithID(destinationClassDescription, null, context);
                }
              }

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    T obj = (T) routeObjectForKey(ERXStringUtilities.uncapitalize(entityName()));
    return obj;
  }


  protected ERXKeyFilter queryFilter() {
    ERXKeyFilter filter = ERXKeyFilter.filterWithAllRecursive();
    return filter;
  }

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    ERXKeyFilter filter = ERXKeyFilter.filterWithAllRecursive();
    return filter;
  }


  protected ERXKeyFilter showFilter() {
    ERXKeyFilter filter = ERXKeyFilter.filterWithAttributesAndToOneRelationships();
    return filter;
  }

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    ERXKeyFilter filter = ERXKeyFilter.filterWithAttributesAndToOneRelationships();
    return filter;
  }


  protected ERXKeyFilter updateFilter() {
    ERXKeyFilter filter = ERXKeyFilter.filterWithAttributesAndToOneRelationships();
    return filter;
  }

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