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Version 7.1 by David Avendasora on 2008/01/28 19:07
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1 If you want to count the number of objects off a to-many, but without fetching all of them into memory, then add this to your //Entity.java templates inside the to-many section~://
2
3 {{code}}
4
5 public Number count${relationship.capitalizedName}() {
6 return countForRelationship("${relationship.name}");
7 }
8
9 public Number qualifierFor${relationship.capitalizedName}() {
10 return qualifierForRelationshipWithKey("${relationship.name}");
11 }
12
13
14 {{/code}}
15
16 Then either add this to //Entity.java (lame), or to a generic superclass that you use for all of your EO objects (preferred), add this~://
17
18 {{code}}
19
20 public EOQualifier qualifierForRelationshipWithKey(String aKey)
21 {
22 this.willRead();
23
24 if ((aKey != null))
25 {
26 String anEntityName = this.entityName();
27 EOEntity anEntity = EOModelGroup.defaultGroup().entityNamed(anEntityName);
28 EORelationship aRelationship = anEntity.relationshipNamed(aKey);
29
30 if (aRelationship != null)
31 {
32 EOEditingContext anEditingContext = this.editingContext();
33 EOGlobalID aGlobalID = anEditingContext.globalIDForObject(this);
34 String aModelName = anEntity.model().name();
35 EODatabaseContext aDatabaseContext = EOUtilities.databaseContextForModelNamed(anEditingContext,
36 aModelName);
37 aDatabaseContext.lock();
38 NSDictionary aRow = aDatabaseContext.snapshotForGlobalID(aGlobalID);
39 aDatabaseContext.unlock();
40 EOQualifier aQualifier = aRelationship.qualifierWithSourceRow(aRow);
41
42 return aQualifier;
43 }
44 }
45
46 return null;
47 }
48
49 /**
50 * Return count for the given relationship.
51 */
52 public Number countForRelationship(String key)
53 {
54 EOQualifier qual = qualifierForRelationshipWithKey(this, key);
55 if (qual != null)
56 {
57 String anEntityName = this.entityName();
58 EOEntity anEntity = EOModelGroup.defaultGroup().entityNamed(anEntityName);
59 EORelationship aRelationship = anEntity.relationshipNamed(key);
60 return ERXEOControlUtilities.objectCountWithQualifier(this.editingContext(), aRelationship
61 .destinationEntity().name(), qual);
62 }
63 return null;
64
65 }
66
67 {{/code}}