What is the Proper way to create new to-many relationship in CoreData?

Assuming the relationship is bi-directional (i.e. The inverse relationship is defined from both sides), then there is no functional difference between the examples you present. Use whichever makes most sense in your code.

If you are focussed on the Property use Property setClient: Similarly, use Client addPropertiesObject: if your code feels focussed on the Client For completeness, you can also use Client *client = ... Property *property = ... client mutableSetValueForKey:@"properties" addObject:property which makes use of the mutable proxy for the to-many relationship, used in Key-Value Coding. This last option should probably be avoided in favor of the explicit methods above, as Core Data might optimize those methods (an implementation detail; I don't know if this is the case).

Assuming the relationship is bi-directional (i.e. The inverse relationship is defined from both sides), then there is no functional difference between the examples you present. Use whichever makes most sense in your code.

If you are focussed on the Property, use -Property setClient:. Similarly, use -Client addPropertiesObject: if your code feels focussed on the Client. For completeness, you can also use Client *client = ... Property *property = ... client mutableSetValueForKey:@"properties" addObject:property; which makes use of the mutable proxy for the to-many relationship, used in Key-Value Coding.

This last option should probably be avoided in favor of the explicit methods above, as Core Data might optimize those methods (an implementation detail; I don't know if this is the case).

Thanks! I'll stick with what I had then; newProperty. Client = self.

CurrentClient, because it feels simpler, and it's not a response to something within a Client class or view. – GendoIkari Oct 14 '10 at 20:08.

When you have finished adding tables and queries to the Relationships window, click Close. Drag a field (typically the primary key) from one table to the common field (the foreign key) in the other table. To drag multiple fields, press the CTRL key, click each field, and then drag them.

The Edit Relationships dialog box appears. Verify that the field names shown are the common fields for the relationship. If a field name is incorrect, click the field name and select a new field from the list.

To enforce referential integrity for this relationship, select the Enforce Referential Integrity check box. For more information about referential integrity, see the Understanding Referential Integrity and the Enforce Referential Integrity sections. The relationship line is drawn between the two tables.

If you selected the Enforce Referential Integrity check box, the line appears thicker at each end. In addition, again only if you selected the Enforce Referential Integrity check box, the number 1 appears over the thick portion of the line on one side of the relationship, and the infinity symbol (?) appears over the thick portion of the line on the other side. To create a one-to-one relationship Both of the common fields (usually the primary key and foreign key fields) must have a unique index.

This means the Indexed property for these fields should be set to Yes (No Duplicates). If both fields have a unique index, Access creates a one-to-one relationship. To create a one-to-many relationship The field on the "one" side (typically the primary key) of the relationship must have a unique index.

This means the Indexed property for this field should be set to Yes (No Duplicates). The field on the "many" side should not have a unique index. It can have an index, but it must allow duplicates.

This means the Indexed property for this field should be set to either No, or Yes (Duplicates OK). When one field has a unique index and the other does not, Access creates a one-to-many relationship. In Office Access 2007, you can add a field to an existing table that is open in Datasheet view by dragging it from the Field List pane.

The Field List pane shows fields available in related tables and also fields available in other tables. When you drag a field from an "other" (unrelated) table and then complete the Lookup Wizard, a new one-to-many relationship is automatically created between the table in the Field List pane and the table to which you dragged the field. This relationship, created by Access, does not enforce referential integrity by default.

To enforce referential integrity, you must edit the relationship. See the section Change a table relationship for more information. Click the Microsoft Office Button , and then click Open.

In the Open dialog box, select and open the database. In the Navigation pane, right-click the table to which you want to add the field and create the relationship, and click Datasheet View on the shortcut menu. On the Datasheet tab, in the Fields & Columns group, click Add Existing Fields.

The Field List pane appears.

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