Parsing JIRA, Now parsing JSON with dynamic using Newtonsoft fails

xaade

Agreed, but there's pretty much no way to do that with a generic library is what I'm saying, object implementation is still up to you. I guess you could make something that creates a class with generic getters and setters, but that's as far an off-the shelf solution could go.

This is supposed to be possible, but just didn't work.
Again, officially supported, but didn't work at all.

PleegWat

Huh? You nest them.

Have a generic object that can be an object, array, string, number, boolean, or null. Store each of those as appropriate, and recurse. Took me about a day and 1kloc in C from scratch.

blakeyrat

Here, use this:

https://dl.dropboxusercontent.com/u/14815279/JSON.cs

Onyx

@PleegWat said:

Huh? You nest them.

Have a generic object that can be an object, array, string, number, boolean, or null. Store each of those as appropriate, and recurse. Took me about a day and 1kloc in C from scratch.

Oh, sorry, we're talking about different things. Yes, that works out of the box: Objects get converted to QMap<QString, QVariant>, arrays get converted to QList<QVariant>, where QVariant is a generic container that can store primitives and other containers.

I was talking about automatic mapping to custom classes as being out of scope of generic libraries. In my case, I grab notifications JSON from Discourse and map it to my own notification class.

PleegWat

Ah, yeah. You pretty much end up having to do that mapping one way or another. I've got a couple of nested/recursive functions that send it straight back to string. As mentioned, rules engine, we barely use the stuff direct.

dkf

@Onyx said:

I was talking about automatic mapping to custom classes as being out of scope of generic libraries.

There are some libraries that can do that sort of thing in Java (guided by standard JAXB annotations). I don't really recommend them. The pain is rather less if you just accept that JSON doesn't fit very well with very strongly typed languages, and use a data format that matches what is in the JSON itself.

xaade

@dkf said:

data format that matches what is in the JSON itself.

Hmm... looks like it's all strings.
Strings should work.

Onyx

@dkf said:

The pain is rather less if you just accept that JSON doesn't fit very well with very strongly typed languages, and use a data format that matches what is in the JSON itself.

Tell me about it... I have this idiocy:

// QJson will convert all numbers into doubles. Cast them to ints if possible
// This is needed to cast to enums properly, attempting to use a double in enum WRITE function
// will always result in a 0 value
if(i.value().type() == QVariant::Double)
{
    if(i.value().toInt(&conversionOk) == i.value().toDouble(&conversionOk))
    {
        this->setProperty(key.toStdString().c_str(), i.value().toInt(&conversionOk));
        continue;
    }
}

// Let QVariant automatically cast any other types
if(!this->setProperty(key.toStdString().c_str(), i.value()))
{
    qDebug() << "Couldn't set property" << key << "to value" << i.value();
}

Which is... hacky and very error prone. But it works for the limited usecase it's intended to cover. For now. I can always just override it other classes. Or maybe scrap it altogether, I'll see, didn't test with enough different input values yet

Jaime

@blakeyrat said:

You're supposed to serialize into a predefined object, but that assumes a single party owns both server and client and I've never worked in a place where that was the case.

@Onyx said:

Agreed, but there's pretty much no way to do that with a generic library is what I'm saying, object implementation is still up to you. I guess you could make something that creates a class with generic getters and setters, but that's as far an off-the shelf solution could go.

You can do strongly-typed deserialization without control of both sides. Your program will depend on the JSON message being in a certain format. Just because you deserialize into a map doesn't mean that the message can change and your code will figure out what to do.

There is not much difference between

var jsonmsg = JSONLibrary.DeserializeAsMap(jsonstring);
DoSomething(jsonmsg["FirstName"], jsonmsg["LastName"]);

... and ...

class SomeJSONMessage
{
  public string FirstName {get; set;}
  public string LastName {get; set;}
}

var jsonmsg = JSONLibrary.DeserializeAsClass<SomeJSONMessage>(jsonstring);
DoSomething(jsonmsg.FirstName, jsonmsg.LastName);

Both are equally fragile if the other party changes the message. I would argue that the second form is better if the message changes. Once you figure out the new format and fix the class, the strong typing will tell you all of the down-stream implications.

Jaime

@Onyx said:

Tell me about it... I have this idiocy:

That's horrible. It looks to me like you can't depend on the data type you will get back from it. You could get ints for the first six months of production because by some freak chance, a field always has whole integer amounts in it, even though it could have a decimal in it. At some point in the future, your code may stop working.

I can't imagine what you would lose by always returning a Double when the value is unquoted. The auto-detection it's doing doesn't seem to be a good thing.

dkf

@Jaime said:

I would argue that the second form is better if the message changes. Once you figure out the new format and fix the class, the strong typing will tell you all of the down-stream implications.

Two words: JSON Schema. Another word: Bleugh.

Onyx

@Jaime said:

That's horrible. It looks to me like you can't depend on the data type you will get back from it.

It's from Discourse. Of course I can't depend on it. Really, I think I'll have more problems with shit breaking all around than data type.

@Jaime said:

I can't imagine what you would lose by always returning a Double when the value is unquoted. The auto-detection it's doing doesn't seem to be a good thing.

Because I have this silly notion that this:

enum QDiscourseNotificationType { 
    Invalid,
    Mentioned,
    Replied,
    Quoted,
    Edited,
    Liked,
    PrivateMessage,
    InvitedToPrivateMessage,
    InviteeAccepted,
    Posted,
    MovedPost,
    Linked
    GrantedBadg
 };

Makes more sense than having a bunch of hardcoded ints. And, unfortunately, setProperty is not smart enough to cast from double to enum automatically.

Filed under: Fucking hell, why can't Discourse highlight enums?

dkf

@Onyx said:

GrantedBadger

FTFY

Onyx

Change approved for the special "TDWTF edition" of the library.

boomzilla

@dkf said:

JSON Schema.

http://what.thedailywtf.com/t/ibms-jsonx-or-how-to-represent-json-in-xml/3972

Onyx

@Onyx said:

No, don't post links, I really don't want to know. Running out of brain bleach.

CAN'T YOU PEOPLE READ?

accalia

@Onyx said:

No, don't post links, I really don't want to know. Running out of brain bleach.

more is on the way!

Jaime

@Onyx said:

Because I have this silly notion that this:

enum QDiscourseNotificationType {
Invalid,
Mentioned,
Replied,
Quoted,
Edited,
Liked,
PrivateMessage,
InvitedToPrivateMessage,
InviteeAccepted,
Posted,
MovedPost,
Linked
GrantedBadg
};

Makes more sense than having a bunch of hardcoded ints. And, unfortunately, setProperty is not smart enough to cast from double to enum automatically.

But, you know it's an int. Why make a library guess that it's an int rather than a double that just happens to be a whole number (maybe a price field, but everything is whole dollar amounts like a fancy restaurant).

Jaime

@dkf said:

Two words: JSON Schema. Another word: Bleugh.

I know JSON Schema exists. But, if used properly, it will simply be used to build a custom deserializer, just like the code I posted.

blakeyrat

@Onyx said:

Makes more sense than having a bunch of hardcoded ints.

The problem is that the enum is defined by the API owner, and if they change the numbering (say by inserting a new item in between Edited and Liked), you're gonna have a cascade of brokenness. You really ought to number that enum.

BTW the one-pager JSON parser will prefer ints and longs over doubles. So if the API sends an int, your C# code will indeed see an int.

Onyx

@Jaime said:

Why make a library guess that it's an int rather than a double that just happens to be a whole number (maybe a price field, but everything is whole dollar amounts like a fancy restaurant).

@Onyx said:

Which is... hacky and very error prone. But it works for the limited usecase it's intended to cover.

I'm not writing a general purpose library. It will interface with Discourse and nothing else. All other properties are typed and will get automatlcally cast back to whatever type the property is if needed. As I said, I may scrap it all, but for now it's ok and I don't have to manually cast stuff for every single enum I have. If it turns out to be broken in the future I'll throw that bit away.

@blakeyrat said:

The problem is that the enum is defined by the API owner, and if they change the numbering (say by inserting a new item in between Edited and Liked), you're gonna have a cascade of brokenness. You really ought to number that enum.

Good point, I'll do that. I doubt they will insert stuff in many places tbh since most of the numbering is in the DB (and they would break half the posts if they did), but hey, Discourse!

@blakeyrat said:

BTW the one-pager JSON parser will prefer ints and longs over doubles. So if the API sends an int, your C# code will indeed see an int.

Yeah, can't use it since this is C++. Though I have no idea why the hell they decided to cast everything numeric to double without even checking if it has, you know, a decimal separator.

Jaime

@Onyx said:

Though I have no idea why the hell they decided to cast everything numeric to double without even checking if it has, you know, a decimal separator.

The JSON spec. JSON has six types; boolean, null, number, string, array, and object. JavaScript has no int type.

blakeyrat

@Jaime said:

The JSON spec. JSON has six types; boolean, null, number, string, array, and object. JavaScript has no int type.

JavaScript treats its "number" type as ints in certain circumstances and doubles in others. (I don't know the rules off the top of my head. But I do know that 3 + 3 is 6 and not 5.999999999999923 or whatever a double would produce.)

Since that behavior is not very reproducible in other programming languages, there's nothing wrong with interpreting a JavaScript "number" type as whatever type you think is most convenient.

accalia

@blakeyrat said:

JavaScript treats its "number" type as ints in certain circumstances and doubles in others.

actually:

.1 + .2 = 0.30000000000000004
3 + 3 = 6

try that in any language with IEEE floating point numbers.

in JS there are only doubles.

blakeyrat

Oh hey. An "uh, actually" post from Accalia. It's my lucky day.

Jaloopa

@accalia said:

in JS there are only doubles.

That's like the strapline to a new, really boring Games Workshop game

in the grim darkness of the far future, there is only ~~war~~IEEE Floating point specification

Onyx

@accalia said:

in JS there are only doubles.

So Qt devs were right to do what they did, since scripting in JS is supported out of the box, and you'll presumably handle a lot of JSON because of that...

Well, fuck them being right, I'd still prefer the damned thing trying to cast to int if there's no decimal separator in the JSON.

accalia

what? whole numbers have always added losslessly in IEEE so long as both numbers and their result are in the safe representation range (don't require an exponent to move the decimal point to the right)

it's decimals that add weird.

that's just the IEEE floating point number spec.

RaceProUK

@accalia said:

decimal pint

That would be 568 millilitres, yes?

accalia

nein!

it's 568.0000000000000000000000000000001 millilitres!

blakeyrat

@accalia said:

what? whole numbers have always added losslessly in IEEE so long as both numbers and their result are in the safe representation range (don't require an exponent to move the decimal point to the right)

Look. What the fuck ever.

The point is, different programming languages treat numbers differently. As long as the number can be parsed and understood by both, it doesn't fucking matter.

And in cases where the number is mapped to an enum, you need a fucking int in C#. So make it a fucking int.

RaceProUK

@blakeyrat said:

fucking int

Is that how shorts are made?

tar

@blakeyrat said:

The problem is that the enum is defined by the API owner, and if they change the numbering (say by inserting a new item in between Edited and Liked), you're gonna have a cascade of brokenness. You really ought to number that enum.

Is this enum data coming directly from Disrouce JSON?

If not, I'd probably be thinking about serializing/persisting the enum values as strings, at least then you aren't going to be screwed over by renumberings...

If it is, then fuck, why'd they even bother to have an enum there at all?

Onyx

It's integers in JSON. This is notification JSON for a PM I just sent to @QBot:

    {
        "created_at": "2015-02-21T00:19:49.999Z",
        "data": {
            "display_username": "11 replies",
            "original_post_id": 241295,
            "original_username": "Onyx",
            "topic_title": "Test"
        },
        "notification_type": 6,
        "post_number": 21,
        "read": false,
        "slug": "test",
        "topic_id": 7977
    }

Yes, display_username is not a username at all...

Actual meaning is stored in database, this is some of it extracted by @accalia:

notify_types = {
            1: 'mentioned',
            2: 'replied',
            3: 'quoted',
            4: 'edited',
            5: 'liked',
            6: 'private_message',
            7: 'invited_to_private_message',
            8: 'invitee_accepted',
            9: 'posted',
            10: 'moved_post',
            11: 'linked',
            12: 'granted_badge'
        },
        action_types = {
            1: 'bookmark',
            2: 'like',
            3: 'off_topic',
            4: 'inappropriate',
            5: 'vote',
            8: 'spam',
            6: 'notify_user',
            7: 'notify_moderators'
        },

Yes, it's the same for actions.

Now, if they just had strings I'd keep it that way most likely. With integers, I can either map it to an enum, or map it to an array of strings. Enums turn out to be less work, and easier to modify as needed. But given that this shit is in the DB I hope it will be pretty constant.

accalia

@Onyx said:

But given that this shit is in the DB I hope it will be pretty constant.

AFAIK there's no way in /admin to change those values so.... probably?

tar

@Jaime said:

The JSON spec. JSON has six types; boolean, null, number, string, array, and object. JavaScript has no int type

JSON won't even let you store undefined data!

riking

@Onyx said:

What else can you do, really? I can't see a way where you can automatically convert JSON to anything more useful than that.

DisGoBot/discourse/responses.go at master · riking/DisGoBot

Discourse bot in Go. Contribute to riking/DisGoBot development by creating an account on GitHub.

Uses reflection with statically linked RTTI. And I have an easy out if I don't want to figure out what the type actually is: just use interface{} or map[string]interface{}.

@Jaime said:

Both are equally fragile if the other party changes the message

Agreed.

Buddy

@Onyx said:

Actual meaning is stored in database, this is some of it extracted by @accalia:

And in the source of every page (easily extracted with a simple regex):

<script>
        PreloadStore.store("site",{"default_archetype":"regular","notification_types":{"mentioned":1,"replied":2,"quoted":3,"edited":4,"liked":5,"private_message":6,"invited_to_private_message":7,"invitee_accepted":8,"posted":9,"moved_post":10,"linked":11,"granted_badge":12},"post_types":{"regular":1,"moderator_action":2},"groups":[{"id":1,"name":"admins"},{"id":51,"name":"area_bel"},{"id":43,"name":"area_deu"},{"id":42,"name":"area_gbr"},{"id":41,"name":"area_usa"},{"id":50,"name":"bots"},{"id":0,"name":"everyone"},{"id":2,"name":"moderators"},{"id":49,"name":"programmers_testers"},{"id":3,"name":"staff"},{"id":52,"name":"super_sekret_group"},{"id":53,"name":"tl4_plus"},{"id":10,"name":"trust_level_0"},{"id":11,"name":"trust_level_1"},{"id":12,"name":"trust_level_2"},{"id":13,"name":"trust_level_3"},{"id":14,"name":"trust_level_4"}],"filters":["latest","unread","new","read","posted","bookmarks"],"periods":["yearly","monthly","weekly","daily"],"top_menu_items":["latest","unread","new","read","posted","bookmarks","category","categories","top"],"anonymous_top_menu_items":["latest","top","categories","category","categories","top"],"uncategorized_category_id":1,"is_readonly":false,"disabled_plugins":[],"categories":[{"id":13,"name":"General","color":"0E76BD","text_color":"000000","slug":"general","topic_count":474,"post_count":91929,"description":"General: This category is designed for topics that do not fit any other categories.","description_text":"General: This category is designed for topics that do not fit any other categories.","topic_url":"/t/about-the-general-discussion-category/235","read_restricted":false,"permission":1,"notification_level":null,"logo_url":"/uploads/default/3723/50acaa61d431f685.png","background_url":""},{"id":3,"name":"Meta","color":"808281","text_color":"000000","slug":"meta","topic_count":431,"post_count":32238,"description":"Meta: Discussion about this forum, its organization, how it works, and how we can improve it.","description_text":"Meta: Discussion about this forum, its organization, how it works, and how we can improve it.","topic_url":"/t/category-definition-for-meta/2","read_restricted":false,"permission":1,"notification_level":null,"logo_url":"/uploads/default/3732/644a849003f8b73d.png","background_url":""},{"id":16,"name":"Bug","color":"f5f577","text_color":"000000","slug":"bug","topic_count":551,"post_count":9913,"description":"Sandbox to experiment and discuss Discourse bugs. 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@Onyx said:

Now, if they just had strings I'd keep it that way most likely. With integers, I can either map it to an enum, or map it to an array of strings. Enums turn out to be less work, and easier to modify as needed. But given that this shit is in the DB I hope it will be pretty constant.

Covered in http://what.thedailywtf.com/t/may-contain-a-hash-of-options/6830/15:

why bother with the tedious mapping

It's for storing them in the db. Except that they accidentally also used the ints as parameters in several places, making the whole thing an exercise in futility.

Jarry

TL;DR;
but
@Onyx said:

"display_username": "11 replies",

^

tar

Yo, paging @11 replies up in this topic, yo.

riking

Jarry

a little less
i guess calling it label it's too mainstream

riking

@Jarry said:

~~a little less~~
i guess calling it label is too mainstream

ftfy