How to cast Any which can be Realm List or String to a Realm List when applicable
0
In input we have var value: Any which we don't control.
value can represent a String (or anything) as well as a List<MyRealmObject>. And it's in this Realm case that I have a question.
How can I cast the value (Any) to a RealmList?
My end goal is to convert this Realm List to an Array.
When I do value as? List<Object> I get nil.
Or in other words, I would like to avoid this non-generic code:
func foo(value: Any) {
if let val = value as? List<RealmTag> {
myArray = Array(val)
} else if let val = value as? List<RealmUser> {
myArray = Array(val)
} else if let val = value as? List<RealmService> {
myArray = Array(val)
} etc...
}
arrays swift generics realm
asked Nov 12 at 11:48
Kalzem
4,84753968
add a comment |
0
In input we have var value: Any which we don't control.
value can represent a String (or anything) as well as a List<MyRealmObject>. And it's in this Realm case that I have a question.
How can I cast the value (Any) to a RealmList?
My end goal is to convert this Realm List to an Array.
When I do value as? List<Object> I get nil.
Or in other words, I would like to avoid this non-generic code:
func foo(value: Any) {
if let val = value as? List<RealmTag> {
myArray = Array(val)
} else if let val = value as? List<RealmUser> {
myArray = Array(val)
} else if let val = value as? List<RealmService> {
myArray = Array(val)
} etc...
}
arrays swift generics realm
asked Nov 12 at 11:48
Kalzem
4,84753968
Did you try value as? List<MyRealmObject>
– Robert Dresler
Nov 12 at 11:53
@RobertDresler Edited my question to make it clearer, I would like to avoid cast-check the value to all the existing RealmObject I have.
– Kalzem
Nov 12 at 11:56
I'm afraid, the only non-generic type you can cast it safely isRLMListBase.
– user28434
Nov 12 at 11:59
@user28434 That won't help because ListBase isn't a Sequence, so I lose the information of the elements of the list and I can't convert it to an Array afterwards.
– Kalzem
Nov 12 at 12:05
Well, it was the thing I've discovered myself too, no other type in Hierarchy will do, exceptRLMListBase. And you can convert it toArray, or rather copy element to new array, becauseRLMListBasesupportsFastEnumeration.
– user28434
Nov 12 at 12:10
add a comment |
0
0
0
In input we have var value: Any which we don't control.
value can represent a String (or anything) as well as a List<MyRealmObject>. And it's in this Realm case that I have a question.
How can I cast the value (Any) to a RealmList?
My end goal is to convert this Realm List to an Array.
When I do value as? List<Object> I get nil.
Or in other words, I would like to avoid this non-generic code:
func foo(value: Any) {
if let val = value as? List<RealmTag> {
myArray = Array(val)
} else if let val = value as? List<RealmUser> {
myArray = Array(val)
} else if let val = value as? List<RealmService> {
myArray = Array(val)
} etc...
}
arrays swift generics realm
asked Nov 12 at 11:48
Kalzem
4,84753968
In input we have var value: Any which we don't control.
value can represent a String (or anything) as well as a List<MyRealmObject>. And it's in this Realm case that I have a question.
How can I cast the value (Any) to a RealmList?
My end goal is to convert this Realm List to an Array.
When I do value as? List<Object> I get nil.
Or in other words, I would like to avoid this non-generic code:
func foo(value: Any) {
if let val = value as? List<RealmTag> {
myArray = Array(val)
} else if let val = value as? List<RealmUser> {
myArray = Array(val)
} else if let val = value as? List<RealmService> {
myArray = Array(val)
} etc...
}
arrays swift generics realm
arrays swift generics realm
asked Nov 12 at 11:48
Kalzem
4,84753968
asked Nov 12 at 11:48
Kalzem
4,84753968
edited Nov 12 at 11:55
asked Nov 12 at 11:48
Kalzem
4,84753968
asked Nov 12 at 11:48
Kalzem
4,84753968
asked Nov 12 at 11:48
Kalzem
4,84753968
4,84753968
Did you try value as? List<MyRealmObject>
– Robert Dresler
Nov 12 at 11:53
@RobertDresler Edited my question to make it clearer, I would like to avoid cast-check the value to all the existing RealmObject I have.
– Kalzem
Nov 12 at 11:56
I'm afraid, the only non-generic type you can cast it safely isRLMListBase.
– user28434
Nov 12 at 11:59
@user28434 That won't help because ListBase isn't a Sequence, so I lose the information of the elements of the list and I can't convert it to an Array afterwards.
– Kalzem
Nov 12 at 12:05
Well, it was the thing I've discovered myself too, no other type in Hierarchy will do, exceptRLMListBase. And you can convert it toArray, or rather copy element to new array, becauseRLMListBasesupportsFastEnumeration.
– user28434
Nov 12 at 12:10
add a comment |
Did you try value as? List<MyRealmObject>
– Robert Dresler
Nov 12 at 11:53
@RobertDresler Edited my question to make it clearer, I would like to avoid cast-check the value to all the existing RealmObject I have.
– Kalzem
Nov 12 at 11:56
I'm afraid, the only non-generic type you can cast it safely isRLMListBase.
– user28434
Nov 12 at 11:59
@user28434 That won't help because ListBase isn't a Sequence, so I lose the information of the elements of the list and I can't convert it to an Array afterwards.
– Kalzem
Nov 12 at 12:05
Well, it was the thing I've discovered myself too, no other type in Hierarchy will do, exceptRLMListBase. And you can convert it toArray, or rather copy element to new array, becauseRLMListBasesupportsFastEnumeration.
– user28434
Nov 12 at 12:10
Did you try value as? List<MyRealmObject>
– Robert Dresler
Nov 12 at 11:53
Did you try value as? List<MyRealmObject>
– Robert Dresler
Nov 12 at 11:53
@RobertDresler Edited my question to make it clearer, I would like to avoid cast-check the value to all the existing RealmObject I have.
– Kalzem
Nov 12 at 11:56
@RobertDresler Edited my question to make it clearer, I would like to avoid cast-check the value to all the existing RealmObject I have.
– Kalzem
Nov 12 at 11:56
I'm afraid, the only non-generic type you can cast it safely is
RLMListBase.– user28434
Nov 12 at 11:59
I'm afraid, the only non-generic type you can cast it safely is
RLMListBase.– user28434
Nov 12 at 11:59
@user28434 That won't help because ListBase isn't a Sequence, so I lose the information of the elements of the list and I can't convert it to an Array afterwards.
– Kalzem
Nov 12 at 12:05
@user28434 That won't help because ListBase isn't a Sequence, so I lose the information of the elements of the list and I can't convert it to an Array afterwards.
– Kalzem
Nov 12 at 12:05
Well, it was the thing I've discovered myself too, no other type in Hierarchy will do, except
RLMListBase. And you can convert it to Array, or rather copy element to new array, because RLMListBase supports FastEnumeration.– user28434
Nov 12 at 12:10
Well, it was the thing I've discovered myself too, no other type in Hierarchy will do, except
RLMListBase. And you can convert it to Array, or rather copy element to new array, because RLMListBase supports FastEnumeration.– user28434
Nov 12 at 12:10
add a comment |
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53261540%2fhow-to-cast-any-which-can-be-realm-list-or-string-to-a-realm-list-when-applicabl%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
active
oldest
votes
active
oldest
votes
active
oldest
votes
active
oldest
votes
draft saved
draft discarded
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53261540%2fhow-to-cast-any-which-can-be-realm-list-or-string-to-a-realm-list-when-applicabl%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Did you try value as? List<MyRealmObject>
– Robert Dresler
Nov 12 at 11:53
@RobertDresler Edited my question to make it clearer, I would like to avoid cast-check the value to all the existing RealmObject I have.
– Kalzem
Nov 12 at 11:56
I'm afraid, the only non-generic type you can cast it safely is
RLMListBase.– user28434
Nov 12 at 11:59
@user28434 That won't help because ListBase isn't a Sequence, so I lose the information of the elements of the list and I can't convert it to an Array afterwards.
– Kalzem
Nov 12 at 12:05
Well, it was the thing I've discovered myself too, no other type in Hierarchy will do, except
RLMListBase. And you can convert it toArray, or rather copy element to new array, becauseRLMListBasesupportsFastEnumeration.– user28434
Nov 12 at 12:10