Core data: making object related to another object when a property changes

ok, say with core data I have object1 and it has a to-many relationship with object2
and when property1 if object1 changes then the number of/contents of the related object2 changes as well
think of a box of chocolate... object1 is the box and object2 is the chocolate... object1 has a string property that is the colour of the chocolate and when it changes the chocolate objects need to change accordingly
maybe not the best example but you guys should get the idea
I'm not sure how to do this without causing errors
what I did initially was this:
-(NSString*)words {
printf("retrieving words
[self willAccessValueForKey: @"words"];
NSString* s = words;
[self didAccessValueForKey: @"words"];
return s;
-(void)setWords: (NSString*)newWords {
printf("setting words
[self willChangeValueForKey: @"words"];
words = newWords;
[self didChangeValueForKey: @"words"];
- (void)setNilValueForKey:(NSString *)key {
printf("in nil value
if ([key isEqualToString:@"words"]) {
self.words = @"";
else {
[super setNilValueForKey:key];
which has broken the redo
I went ahead anyway and redone the setWords
-(void)setWords: (NSString*)newWords {
[self willChangeValueForKey: @"words"];
words = newWords;
[self didChangeValueForKey: @"words"];
// NSManagedObjectContext *managedObjectContext = [self managedObjectContext];
// [[managedObjectContext undoManager] disableUndoRegistration];
NSArray* linesWords = [newWords componentsSeparatedByString: @" "];
NSSet* newContainsWords = [NSSet set];
[self removeContainsWords: self.containsWords];
for(unsigned int i = 0; i < [linesWords count]; i++) {
NSEntityDescription* entity = [NSEntityDescription insertNewObjectForEntityForName: @"AtomWord"
inManagedObjectContext: managedObjectContext];
AtomWord* wordEntity = (AtomWord*)entity;
wordEntity.word = [linesWords objectAtIndex: i];
newContainsWords = [newContainsWords setByAddingObject: wordEntity];
[self addContainsWords: newContainsWords];
// [managedObjectContext processPendingChanges];
// [[managedObjectContext undoManager] enableUndoRegistration];
this too also broke the redo
I uncommented the undo manager stuff to see what would happen, thinking it would group everything together for the undo-redo
but instead it made two copies of object1...
what's the best way to do this?

I don't see an option to upload images so I'm going to assume you can see this ascii representation of it
|----------------| |----------------|
| Line | | Word |
|----------------| |----------------|
|v Attributes | |v Attributes |
|lineOfWords | |theWord |
|----------------| |----------------|
|v RelationShips | |v RelationShips |
|madeUpOf |<----->>|containedIn |
|----------------| |----------------|
lineOfWords and theWord are string properties
when lineOfWords changes I need the set of Words it contains to change to reflect the change in lineOfWords
The reason I need words to be an entity itself is because each word has attributes (not shown there) that are specific to each word
This is how I made the schema, I'm not sure how or if you can reflect the relationship between the property and list or if there is a better way to do it...

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etresoft wrote:
DavidMan wrote:
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When I run the above on the simulator I get the following output (which looks reasonable to me):
2011-06-06 09:50:28.123 renniksoft[937:207] INITIAL FREEMEM: 14782464
2011-06-06 09:50:28.128 renniksoft[937:207] FREEMEM: 14807040
2011-06-06 09:50:28.135 renniksoft[937:207] FREEMEM: 14831616
2011-06-06 09:50:28.139 renniksoft[937:207] FREEMEM: 14852096
2011-06-06 09:50:28.142 renniksoft[937:207] FREEMEM: 14872576
2011-06-06 09:50:28.146 renniksoft[937:207] FREEMEM: 14897152
2011-06-06 09:50:28.149 renniksoft[937:207] FREEMEM: 14917632
2011-06-06 09:50:28.153 renniksoft[937:207] FREEMEM: 14938112
2011-06-06 09:50:28.158 renniksoft[937:207] FREEMEM: 14962688
2011-06-06 09:50:28.161 renniksoft[937:207] FREEMEM: 14983168
2011-06-06 09:50:28.165 renniksoft[937:207] FREEMEM: 14741504
2011-06-06 09:50:28.168 renniksoft[937:207] FREEMEM: 14770176
2011-06-06 09:50:28.174 renniksoft[937:207] FREEMEM: 14790656
2011-06-06 09:50:28.177 renniksoft[937:207] FREEMEM: 14811136
2011-06-06 09:50:28.182 renniksoft[937:207] FREEMEM: 14831616
2011-06-06 09:50:28.186 renniksoft[937:207] FREEMEM: 14589952
2011-06-06 09:50:28.189 renniksoft[937:207] FREEMEM: 14610432
2011-06-06 09:50:28.192 renniksoft[937:207] FREEMEM: 14630912
2011-06-06 09:50:28.194 renniksoft[937:207] FREEMEM: 14651392
2011-06-06 09:50:28.197 renniksoft[937:207] FREEMEM: 14671872
2011-06-06 09:50:28.200 renniksoft[937:207] FREEMEM: 14692352
2011-06-06 09:50:28.203 renniksoft[937:207] FINAL FREEMEM: 14716928
However, when I run it on an actual iPhone 4 (4.3.3) I get the following result:
2011-06-06 09:55:54.341 renniksoft[4727:707] INITIAL FREEMEM: 267927552
2011-06-06 09:55:54.348 renniksoft[4727:707] FREEMEM: 267952128
2011-06-06 09:55:54.702 renniksoft[4727:707] FREEMEM: 265818112
2011-06-06 09:55:55.214 renniksoft[4727:707] FREEMEM: 265355264
2011-06-06 09:55:55.714 renniksoft[4727:707] FREEMEM: 264892416
2011-06-06 09:55:56.215 renniksoft[4727:707] FREEMEM: 264441856
2011-06-06 09:55:56.713 renniksoft[4727:707] FREEMEM: 263979008
2011-06-06 09:55:57.226 renniksoft[4727:707] FREEMEM: 264089600
2011-06-06 09:55:57.721 renniksoft[4727:707] FREEMEM: 263630848
2011-06-06 09:55:58.226 renniksoft[4727:707] FREEMEM: 263168000
2011-06-06 09:55:58.726 renniksoft[4727:707] FREEMEM: 262705152
2011-06-06 09:55:59.242 renniksoft[4727:707] FREEMEM: 262852608
2011-06-06 09:55:59.737 renniksoft[4727:707] FREEMEM: 262389760
2011-06-06 09:56:00.243 renniksoft[4727:707] FREEMEM: 261931008
2011-06-06 09:56:00.751 renniksoft[4727:707] FREEMEM: 261992448
2011-06-06 09:56:01.280 renniksoft[4727:707] FREEMEM: 261574656
2011-06-06 09:56:01.774 renniksoft[4727:707] FREEMEM: 261148672
2011-06-06 09:56:02.290 renniksoft[4727:707] FREEMEM: 260755456
2011-06-06 09:56:02.820 renniksoft[4727:707] FREEMEM: 260837376
2011-06-06 09:56:03.334 renniksoft[4727:707] FREEMEM: 260395008
2011-06-06 09:56:03.825 renniksoft[4727:707] FREEMEM: 259932160
2011-06-06 09:56:04.346 renniksoft[4727:707] FINAL FREEMEM: 259555328
The amount of free memory reduces each time round the loop in proportion to the managed objects I fetch e.g. if I fetch twice as many objects then the free memory reduces twice as quickly - so I'm pretty confident it is the managed objects that are not being released. Note that the entities that are being fetched are very basic, just two attributes, a string and a 16 bit integer. There are 1000 of them being fetched in the examples above. The code I used to generate them is as follows:
// Create test entities
for(int i=0; i<1000; i++) {
    id entity = [NSEntityDescription insertNewObjectForEntityForName:@"TestEntity" inManagedObjectContext:context];
    [entity setValue:[NSString stringWithFormat:@"%d",i] forKey:@"name"];
    [entity setValue:[NSNumber numberWithInt:i] forKey:@"value"];
if (![context save:nil]) {
    NSLog(@"Couldn't save");
If anyone can explain to me what is going on I'd be very grateful! This issue is the only only one holding up the release of my app. It works beautifully on the simulator!!
Please let me know if there's any more info I can supply.

Update: I modified the above code so that the fetch (and looppool etc.) take place when a timer fires. This means that the fetches aren't blocked in viewDidLoad.
The result of this is that the issue happens exactly as before, but the applicationDidReceiveMemoryWarning is fired as expected:
2011-06-08 09:54:21.024 renniksoft[5993:707] FREEMEM: 6131712
2011-06-08 09:54:22.922 renniksoft[5993:707] Received memory warning. Level=2
2011-06-08 09:54:22.926 renniksoft[5993:707] applicationDidReceiveMemoryWarning
2011-06-08 09:54:22.929 renniksoft[5993:707] FREEMEM: 5615616
2011-06-08 09:54:22.932 renniksoft[5993:707] didReceiveMemoryWarning
2011-06-08 09:54:22.935 renniksoft[5993:707] FREEMEM: 5656576

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Does anyone know how the DAO pattern looks like when it is used for a data warehouse rather than a normal transactional database?
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Shreyas,
[For those not familiar with our Data Access Object Pattern, the
beta version of the pattern is available on JDC (needs JDC login) at:
http://developer.java.sun.com/developer/restricted/patterns/DataAccessObject.html]
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Now using DAOs with Entity beans is applicable only in bean-managed
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entity bean class bloated and difficult to manage when changes
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by employing the DAO factory strategy as described in the DAO pattern
in our catalog.
Coming back to you point about making the data access transparent
to the clients; it is possible to achieve this by using DAO and
DAO factory strategy. In the current version of the pattern,
included in the book, we provide sample code to show how
to design DAO classes and to apply DAO factory strategy.
On your last point about using java classes instead of entity beans, this
is not the intention of the DAO pattern. Entity beans serve a different
purpose in the architecture as coarse-grained transactional components.
entity beans use DAOs in BMP implementations, but are not replaced
by DAOs. However, DAO classes are reusable. The same DAO that is
used by an entity bean to retrieve some data in one application scenario,
can be reused by a servlet in another application scenario
that needs the same data, but does not use entity beans.
So bottom line is that DAOs address the need to data access and
manipulation and work together with entity beans in BMP implementations.
thanks,
-deepak

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Hi,
I have big problem.I am working on j2ee application(using jsp & servlets).I am using Jboss App Server. The server is placed in India.
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Hi,
I have big problem.I am working on j2ee application(using jsp & servlets).I am using Jboss App Server. The server is placed in India.
But there is two offices, one is in India ,another one is in USA.
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Help appreciated!
P.Saravanan

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Thanks

Bobby,
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Regards,
Nagesh Ganisetti.

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Hi,
In pl/sql I am building and executing a query dynamically. How can I stored the output of the query in object type. I have defined the following object type and need to store the
output of the query in it. Here is the Object Type I have
CREATE OR REPLACE TYPE DEMO.FIRST_RECORDTYPE AS OBJECT(
pkid NUMBER,
pkname VARCHAR2(100);
pkcity VARCHAR2(100);
pkcounty VARCHAR2(100)
CREATE OR REPLACE TYPE DEMO.FIRST_RECORDTYPETAB AS TABLE OF FIRST_RECORDTYPE;Here is the query generated at runtime and is inside a LOOP
--I initialize my Object Type*
data := new FIRST_RECORDTYPETAB();
FOR some_cursor IN c_get_ids (username)
LOOP
x_context_count := x_context_count + 1;
-- here I build the query dynamically and the same query generated is
sql_query := 'SELECT pkid as pid ,pkname as pname,pkcity as pcity, pkcounty as pcounty FROM cities WHERE passed = <this value changes on every iteration of the cursor>'
-- and now I need to execute the above query but need to store the output
EXECUTE IMMEDIATE sql_query
INTO *<I need to save the out put in the Type I defined>*
END LOOP;
How can I save the output of the dynamically built query in the Object Type. As I am looping so the type can have several records.
Any help is appreciated.
Thanks

hai ,
solution for Dynamically built query on execution How to save the data in Object Type.
Step 1:(Object creation)
SQL> ED
Wrote file afiedt.buf
1 Create Or Replace Type contract_details As Object(
2 contract_number Varchar2(15),
3 contrcat_branch Varchar2(15)
4* );
SQL> /
Type created.
Step 2:(table creation with object)
SQL> Create Table contract_dtls(Id Number,contract contract_details)
2 /
Table created.
Step 3:(execution Of procedure to insert the dynamic ouput into object types):
Declare
LV_V_SQL_QUERY Varchar2(4000);
LV_N_CURSOR Integer;
LV_N_EXECUTE_CURSOR Integer;
LV_V_CONTRACT_BR Varchar2(15) := 'TNW'; -- change the branch name by making this as input parameter for a procedure or function
OV_V_CONTRACT_NUMBER Varchar2(15);
LV_V_CONTRACT_BRANCH Varchar2(15);
Begin
LV_V_SQL_QUERY := 'SELECT CONTRACT_NUMBER,CONTRACT_BRANCH FROM CC_CONTRACT_MASTER WHERE CONTRACT_BRANCH = '''||LV_V_CONTRACT_BR||'''';
LV_N_CURSOR := Dbms_Sql.open_Cursor;
Dbms_Sql.parse(LV_N_CURSOR,LV_V_SQL_QUERY,2);
Dbms_Sql.define_Column(LV_N_CURSOR,1,OV_V_CONTRACT_NUMBER,15);
Dbms_Sql.define_Column(LV_N_CURSOR,2,LV_V_CONTRACT_BRANCH,15);
LV_N_EXECUTE_CURSOR := Dbms_Sql.Execute(LV_N_CURSOR);
Loop
Exit When Dbms_Sql.fetch_Rows (LV_N_CURSOR)= 0;
Dbms_Sql.column_Value(LV_N_CURSOR,1,OV_V_CONTRACT_NUMBER);
Dbms_Sql.column_Value(LV_N_CURSOR,2,LV_V_CONTRACT_BRANCH);
Dbms_Output.put_Line('CONTRACT_BRANCH--'||LV_V_CONTRACT_BRANCH);
Dbms_Output.put_Line('CONTRACT_NUMBER--'||OV_V_CONTRACT_NUMBER);
INSERT INTO contract_dtls VALUES(1,CONTRACT_DETAILS(OV_V_CONTRACT_NUMBER,LV_V_CONTRACT_BRANCH));
End Loop;
Dbms_Sql.close_Cursor (LV_N_CURSOR);
COMMIT;
Exception
When Others Then
Dbms_Output.put_Line('SQLERRM--'||Sqlerrm);
Dbms_Output.put_Line('SQLERRM--'||Sqlcode);
End;
step 4:check the values are inseted in the object included table
SELECT * FROM contract_dtls;
Regards
C.karukkuvel

Core data: making object related to another object when a property changes

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