Core Data on iOS 5 Tutorial: How To Work with Relations and Predicates | kultnet.info
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The book also investigates other comparable theories and practices in software science, including emerging technologies, from their computational foundations in terms of models, methodologies, and tools. Again, there is a commented-out section of code for this, but instead of using it, replace that code with the following: Build and run, add a few banks, and swipe one of the cells to show the delete button.
Also make sure that a XIB is generated. The view will be pushed by a view controller, so you might want to visualize the space taken by a navigation bar. This will be displayed when necessary via code to edit dates.
For the moment, place the picker outside of the visible area of the view.
ios - Core Data NSPredicate fetch on entity relationship using in clause - Stack Overflow
The Y of the picker should be set to With the picker selected, switch to the Size Inspector tab on the right sidebar and set its position as follows: Add it below the existing initWithNibName: The operation in this case is easy: Add the code for it to the end of the file but before the final end: Add it to the end of the file: Add the necessary code again to the end of the file: Add the following code below viewDidLoad: Add the code for those to the end of the file: Before showing the date picker, the first responder for all text fields is resigned, thus effectively dismissing the keyboard if it was visible.
To test your new view, you need to push it onto the navigation stack when a cell is tapped. Run the app and create a few instances of banks.
- Core Data on iOS 5 Tutorial: How To Work with Relations and Predicates
Each bank record is editable, including the close date. To save data, hit the save button; to discard changes, just tap the back button. Notice that the date picker and the keyboard never obstruct each other. Changes are reflected in the list of banks with no need to refresh the table view. Think of the classic example of employees and departments — an employee is said to belong to a department, and a department has employees.
In database modeling, relationships can be of three types: This property is usually referred to as cardinality.
In the example from the previous section, there is already a relation modeled in Core Data: This is a one-to-one relationship: The graphical view stresses this point by connecting the two entities with one single arrow line. In other words, these two only have eyes for each other. This is just a string identifying the name of the relation.
This is the target or the destination class of the relation. The answer to the question: Is the destination a single object or not?
If yes, the relation is of type to-one, otherwise it is a to-many. The definition of the inverse function. It is pretty rare to find a domain where this is not needed. It is also a sort of logical necessity: In your example, a department can have more than one employee, so this is a to-many relation. As a general rule, a one-to-many relation has a many-to-one inverse.
In case you want to define a many-to-many relationship, you simply define one relation as to-many and its inverse as a to-many as well. Make sure you define an inverse for each relationship, since Core Data exploits this information to check the consistency of the object graph whenever a change is made.
This defines the behavior of the application when the source object of a relationship is deleted.
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For the delete rule in 5 above, there are four possible values: Nullify is the simplest option. They just keep thinking they have not been fired: If you select cascade as the delete rule, then when you delete the source object it also deletes the destination object s. Such a rule is appropriate only if you want to close a department and fire all of its employees as well.
In this case it is enough to set the delete rule for department to cascade and delete that department record.
Deny, on the other hand, prevents accidental deletions. Delete rules have to be specified for both sides of a relationship, from employee to department and vice versa. Each domain implements its own business logic, so there is no general recipe for setting delete rules. Just remember to pay attention when using the cascade rule, since it could result in unexpected consequences.
To maximize the performance of your application, remember this when you devise your data model and try to use relationships only if necessary. The first step is to add a new entity. The delete rule is the default, nullify 4. As above, this is a to-many relationship 3 with a delete rule of nullify. A new class, named Tag, will pop up in your project tree. Sometimes, quite often, in fact: If this happens to you, select one set of instances and delete them, but choose to remove references rather than to trash the files.
At this point, you have changed the Core Data model, so your app will not be compatible with the old model on your device.56. Core Data Relationships (iOS Application Development with Swift 3.0)
This new view controller will facilitate the creation of new tags and associating them to a bank details object.
Remember to check the box to create the accompanying XIB file. Finally, you add a method to initialize the component with an instance of details.
Core Data Relationships
Add the code for it as follows to the end of the file but before the final end: Replace the existing viewDidLoad with the following: You need this to show a tag as picked by means of a tick in the table view. You also set up a navigation item to add new tags. Add the following below viewDidLoad: Now add the following code to the end of the file: The code above will display an alert asking the user to insert a new tag: In such a case, instead of implementing the change protocols to the table, you fetch the result again and reload the table view for the sake of simplicity.
YES]; if [pickedTags containsObject: Next implement this callback: At the bottom of the method implementation, add this code: