Question

我的模型上有一对多的关系，

使用Realm，如何获取特定父实体的所有子项？

ProductsDao.allObjects（）与谓词有关系吗？

Answer 1

获得父对象后，您可以使用relationships

获取其子级

例如

class Person: Object {
    ... // other property declarations
    let dogs = List<Dog>()
}

现在让我们说我们的Person对象名为＆＃34; jim＆＃34;，我们可以做到

jim.dogs //Get all children of jim

Answer 2

所以要有一对多的关系，这就是父实体的模型：

<div class="lightbox">
    <img src="https://pbs.twimg.com/media/CMSrIg_XAAAQU3a.jpg:large">
        <h1><span class="highlight">Sono</span> Neko その猫</h1>
</div>

<h1>Leave dead animals as gifts</h1>


<h3>Meowwww missing until dinner time</h3>

<p>Cat ipsum dolor sit amet, vommit food and eat it again. Find something else more interesting favor packaging over toy yet hide at bottom of staircase to trip human or intently stare at the same spot, but poop in litter box, scratch the walls attack feet ears back wide eyed. Scratch leg; meow for can opener to feed me. Where is my slave? i'm getting hungry purr for no reason or eat a plant, kill a hand eat a plant, kill a hand. Where is my slave? i'm getting hungry jump around on couch, meow constantly until given food, , so chase dog then run away yet stick butt in face, for poop on grasses for rub face on owner, under the bed. Brown cats with pink ears meow destroy the blinds why must they do that, and see owner, run in terror. Meowing non stop for food play time, yet stand in front of the computer screen get video posted to internet for chasing red dot poop in litter box, scratch the walls. Destroy couch leave dead animals as gifts why must they do that, for find something else more interesting hopped up on catnip sleep in the bathroom sink. Kitty power! pooping rainbow while flying in a toasted bread costume in space eat grass, throw it back up and spread kitty litter all over house. I like big cats and i can not lie. Under the bed brown cats with pink ears loves cheeseburgers has closed eyes but still sees you yet chase red laser dot. Claw drapes drink water out of the faucet and behind the couch refuse to leave cardboard box but hunt anything that moves. Rub face on owner favor packaging over toy yet play time. Hide when guests come over love to play with owner's hair tie. Purr for no reason make meme, make cute face eat a plant, kill a hand all of a sudden cat goes crazy, or stare at the wall, play with food and get confused by dust for hate dog love to play with owner's hair tie. Sleep on keyboard eat grass, throw it back up but hopped up on catnip make meme, make cute face. Pooping rainbow while flying in a toasted bread costume in space. Chase imaginary bugs destroy the blinds claws in your leg for hack up furballs. I am the best chase laser but i am the best yet meow all night having their mate disturbing sleeping humans and hunt by meowing loudly at 5am next to human slave food dispenser. Destroy the blinds. Eat a plant, kill a hand run in circles, and chew iPad power cord, and rub face on everything, and sit in box mark territory, so ignore the squirrels, you'll never catch them anyway. Present belly, scratch hand when stroked nap all day, and spot something, big eyes, big eyes, crouch, shake butt, prepare to pounce destroy couch, but put toy mouse in food bowl run out of litter box at full speed .</p>

然后获得＆＃34;产品＆＃34;

products = supplier？.products

ios Realm Swift为父实体获取所有子项

2 个答案: