我有一个具有一对多关系的 Food 实体：
- (void)addIngredientsObject:(Ingredient *)value;
- (void)removeIngredientsObject:(Ingredient *)value;
- (void)addIngredients:(NSSet *)values;
- (void)removeIngredients:(NSSet *)values;
成分实体具有：
@class Food;
@interface Ingredient : NSManagedObject
@property (nonatomic, strong) NSNumber * quantity;
@property (nonatomic, strong) NSString * recordUUID;
@property (nonatomic, strong) Food *foodItem;
@end
我认为食物就像一个食谱，如果有 Food.ingredients 的项目，它就是一个食谱，否则不是。
现在，当我尝试在我的（食物）食谱中添加配料时：
Ingredient *recipeIngredient = [[Ingredient alloc] init];
recipeIngredient.foodItem = ingredient;
NSLog(@"ingredient: %@", ingredient.name);
recipeIngredient.quantity = q;
[addRecipeController.items addObject:recipeIngredient];
和
recipe = [[Food alloc] init];
// Controllare che il nome sia univoco
recipe.name = nameTextField.text;
// Compute
for(Ingredient *ingredient in items) {
[recipe addValuesFromFood:ingredient.foodItem withQuantity:ingredient.quantity];
[recipe addIngredientsObject:ingredient];
}
// Defaults
recipe.bookmark = [NSNumber numberWithBool:NO];
recipe.complex = [NSNumber numberWithBool:YES];
recipe.dirty = [NSNumber numberWithBool:NO];
recipe.lookback = [NSNumber numberWithBool:YES];
recipe.userAdd = [NSNumber numberWithBool:YES];
NSLog(@"pro: %f", recipe.pro.floatValue);
NSLog(@"items: %d", [recipe.ingredients count]);
它保存成功。
但是当我进入细节并尝试检查我食谱的成分时......
NSMutableSet *foods = [item mutableSetValueForKey:@"ingredients"];
for(Ingredient *ing in foods) {
NSLog(@"Class: %@", NSStringFromClass([ing.foodItem class]));
NSLog(@"Name: %@", ing.foodItem.name);
}
我知道所有成分的名称都等于配方成分...这是错误的...如果我尝试在此循环中记录名称：
// Compute
for(Ingredient *ingredient in items) {
// NSLOG for food name here
[recipe addValuesFromFood:ingredient.foodItem withQuantity:ingredient.quantity];
[recipe addIngredientsObject:ingredient];
}
一切都是正确的，但是在 [recipe addIngredientsObject:ingredient] 之后出现问题...
这是怎么回事？！无法逃避这个问题！