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elmlang | general | I'm seeing the same feedback (maybe it was already in debug mode because I'm in development mode). | 2019-02-15T11:19:17.470100 | Antonette |
elmlang | general | debug should only impact whether `elm` receives the `--debug` flag (enabling the time traveling debugger) | 2019-02-15T11:20:12.470300 | Huong |
elmlang | general | (I've never worked with webpack, so I'm sorry I can't be of more help!) | 2019-02-15T11:20:58.470500 | Huong |
elmlang | general | Wait... arf. Ok. Got it. I needed to reload the webpack server every time I changed the config apparently... | 2019-02-15T11:21:00.470700 | Antonette |
elmlang | general | does anyone write elm in an idiomatic Haskell way? | 2019-02-15T11:21:30.471300 | Modesto |
elmlang | general | trying to use typeclasses? | 2019-02-15T11:21:42.471500 | Modesto |
elmlang | general | Haha | 2019-02-15T11:21:49.471600 | Huong |
elmlang | general | Don't feel bad, I guess I'm paying for my team and my inexperience at the time we started working with Elm. | 2019-02-15T11:22:00.471800 | Antonette |
elmlang | general | Yeah, it doesn't reload that, I've noticed :sweat_smile: | 2019-02-15T11:22:04.472000 | Huong |
elmlang | general | elm does not have typeclasses. Do you mean it the other way around? | 2019-02-15T11:22:34.472500 | Virgie |
elmlang | general | like this packages | 2019-02-15T11:22:55.473100 | Modesto |
elmlang | general | <https://package.elm-lang.org/packages/arowM/elm-monoid/latest/Monoid> | 2019-02-15T11:22:56.473300 | Modesto |
elmlang | general | Well, at least I know why what I was doing didn't seem to have any effect on the results whatsoever :sweat_smile: | 2019-02-15T11:23:14.473700 | Antonette |
elmlang | general | that doesn't really work for the more interesting typeclasses, because in elm a type parameter has to be of kind Type (also written as *) | 2019-02-15T11:23:33.474300 | Virgie |
elmlang | general | Thanks for the serendipitous influence :wink: | 2019-02-15T11:24:03.474900 | Antonette |
elmlang | general | so while that approach works for Monoid, and would for Semigroup, it doesn't work for Monad, Functor, Applicative, Foldable, Traversable, ect. | 2019-02-15T11:24:05.475100 | Virgie |
elmlang | general | Well, you know what it f-ing works! | 2019-02-15T11:25:00.476100 | Antonette |
elmlang | general | because those all take a type parameter `f`, like in `Functor f => ` then the `f` is applied to another type. Elm does not currently support that | 2019-02-15T11:25:05.476400 | Virgie |
elmlang | general | (at least I can one-require the modules) | 2019-02-15T11:25:18.476500 | Antonette |
elmlang | general | Thanks a bunch for all of that y'all :wink: | 2019-02-15T11:25:32.476700 | Antonette |
elmlang | general | ok | 2019-02-15T11:25:48.477100 | Modesto |
elmlang | general | thank you | 2019-02-15T11:25:54.477400 | Modesto |
elmlang | general | I was planning to make a Complex Numbers package | 2019-02-15T11:26:07.477800 | Modesto |
elmlang | general | and wanted the type to implement Monoid | 2019-02-15T11:26:19.478200 | Modesto |
elmlang | general | off the top of my head I don't know how relavent the other typeclasses are | 2019-02-15T11:26:55.479400 | Modesto |
elmlang | general | monoid for numbers is extra weird because there are two sensible instances. Having an explicit name for both operations will be much nicer I think | 2019-02-15T11:27:02.479600 | Virgie |
elmlang | general | general tip: look at the elm-geometry api. It takes some really abstract concepts and tries to give good names to the operations you might want to do. | 2019-02-15T11:27:55.480500 | Virgie |
elmlang | general | Now the real question is whether a change that should only impact one `main` module will recompile them all or not! | 2019-02-15T11:28:43.480600 | Huong |
elmlang | general | Yep ; and that's what I've started to investigate :wink: | 2019-02-15T11:29:13.481100 | Antonette |
elmlang | general | But already not compiling X times the file is a big deal. | 2019-02-15T11:29:36.481500 | Antonette |
elmlang | general | so the Monoid typeclasses doesn't require a higher kind of type | 2019-02-15T11:29:56.481900 | Modesto |
elmlang | general | thank you for another perspective on it | 2019-02-15T11:30:21.482300 | Modesto |
elmlang | general | hey,
wanted to talk/ask about one thing. Recently in my project I encountered rather peculiar situation. We had a model for the user that may have the role and permissions against resources. You know, sth along `role: "admin", permissions: []`. So the domain of the problem suggested that admin does not need to have any permissions because he can do anything he likes while user can have certain permissions. That's why I modeled the user along this:
```
type alias User = {name: String, permissions: Permissions}
type Permissions
= AdminPerm
| UserPerm (Dict Key Permission)
```
don't mind the argument for UserPerm. The point is that I discarded the `role` from the data model in favor of union type with permissions. I wanted to avoid a danger that someone sets the permissions for the admin, which was not suppose to be possible in the light of requirements.
One problem down, another pops up. In view I gotta support changing the user role as well as changing permissions. For the ease of my mind, for now, I had created `type Role = Admin | User` which are only possible to be created manually in the view or derived from existing `User` with a function. However I still feel like I am lacking sth or doing one thing in two places even though you cannot use `Role` directly in the User record.
My question, therefore, is perhaps not related to Elm strictly, more to data modeling with types which, as far as I can tell, is encouraged in Elm.
I am just trying to get ahold of some ideas I might have missed. Wonder if someone had to model user related models in quite a safe way to avoid any weird modifications or states a user can end up. My goal is to make it somehow harder to operate on volatile data behind User model. | 2019-02-15T11:56:22.489300 | Floy |
elmlang | general | I'm putting thread here, in case someone wants to share some experiences :slightly_smiling_face: | 2019-02-15T11:57:57.489600 | Floy |
elmlang | general | and as usual, thank you for any feedback :+1: | 2019-02-15T11:59:56.489900 | Floy |
elmlang | general | I'm more used to seeing permissions assigned to roles, and then roles to users who get the union of permissions of their roles. Is there a reason an entity needs both? | 2019-02-15T12:05:43.490100 | Dede |
elmlang | general | E.g. I'm used to seeing more like this:
```type Permission = Create | Read | ...;
type Role = Role { name: String, permissions: List Permission};
type User = User {name: String, roles: List Role};
``` | 2019-02-15T12:07:02.490300 | Dede |
elmlang | general | You can put Resource in at the Permission or Role level, if you need per-resource control. | 2019-02-15T12:07:56.490500 | Dede |
elmlang | general | I think it's not that uncommon to have a system with just permissions and no roles, except an Admin Boolean | 2019-02-15T12:12:44.491500 | Nana |
elmlang | general | I'd probably model it like this:
```
type alias User = {name: String, role: Role}
type Role
= Admin
| NonAdmin (Dict Key Permission)
``` | 2019-02-15T12:14:11.491700 | Nana |
elmlang | general | Yeah, that's also perfectly reasonable. It's just seems unusual to me to try to have both. | 2019-02-15T12:17:15.492300 | Dede |
elmlang | general | But maybe I misunderstood the original intent. | 2019-02-15T12:17:22.492500 | Dede |
elmlang | general | our case defines two roles (admin, user (non admin)) where regular users may have defined permissions (READ, WRITE, DELETE) against resources of specific type identified via ID | 2019-02-15T12:27:21.492700 | Floy |
elmlang | general | are there any good examples for using the config pipeline pattern? especially with configs that have multiple mutually exclusive options? | 2019-02-15T12:36:05.493700 | Emilee |
elmlang | general | ```type Permission = Read | Write | Delete
type Resource = ...
type Role = AdminRole | UserRole { permissions: List Permission, resources: List Resource}
type User = User { name: String, role: Role}
``` | 2019-02-15T12:37:06.493800 | Dede |
elmlang | general | <@Dede> that wouldn't allow a user to have different permissions for different resources though | 2019-02-15T12:38:21.494000 | Nana |
elmlang | general | Sure. I read <@Floy> as asking for this structure. | 2019-02-15T12:38:41.494200 | Dede |
elmlang | general | If it's per-resource, then it's a minor change: | 2019-02-15T12:38:49.494400 | Dede |
elmlang | general | ```type ResourceAuth = ResourceAuth Resource (List Permission)
tuple Role = AdminRole | UserRole {auths: List ResourceAuth}
``` | 2019-02-15T12:40:14.494600 | Dede |
elmlang | general | You could use a record with named fields for ResourceAuth. | 2019-02-15T12:40:37.494800 | Dede |
elmlang | general | You could replace Lists with a set implementation that can handle these types (they're not comparable so stock `set` won't do it.) | 2019-02-15T12:40:52.495000 | Dede |
elmlang | general | etc. | 2019-02-15T12:40:56.495200 | Dede |
elmlang | general | we've been using `Dict.Any` library and actually filled in quite nice | 2019-02-15T12:47:31.496400 | Floy |
elmlang | general | `Nothing` returned from there mean for us that user has no permissions against the resource | 2019-02-15T12:47:46.496600 | Floy |
elmlang | general | which is quite nice to have by default | 2019-02-15T12:47:53.496800 | Floy |
elmlang | general | anyway, you're both recommending to actually play around with renaming but also to keep just one type that suggest if user is an admin or not | 2019-02-15T12:48:31.497000 | Floy |
elmlang | general | that's quite ok, unless I have to change the user role in the view | 2019-02-15T12:49:16.497200 | Floy |
elmlang | general | while it works nice for the admin, for user it requires me to create an empty dict inside the view and pass it along the update's msg | 2019-02-15T12:49:41.497400 | Floy |
elmlang | general | or to have a auxilary type, pure view related, to handle that | 2019-02-15T12:49:51.497600 | Floy |
elmlang | general | unless, maybe I can write down changing the role as sort of a toggle, therefore I don't have to pass permissions inside the update's msg, I just change the role to the opposite one | 2019-02-15T12:50:49.497800 | Floy |
elmlang | general | that sort of makes sense I guess | 2019-02-15T12:51:03.498000 | Floy |
elmlang | general | does it? <@Dede> <@Nana>? | 2019-02-15T12:51:19.498200 | Floy |
elmlang | general | `UserRole` requires the additional data of what are the resources and what are the permissions. | 2019-02-15T12:55:05.498400 | Dede |
elmlang | general | Presumably you have a bunch of checkboxes or something onscreen that provide that info. | 2019-02-15T12:55:18.498600 | Dede |
elmlang | general | Anyhow, however you're denoting it, it's ultimately on your model. | 2019-02-15T12:55:38.498800 | Dede |
elmlang | general | So when you go from AdminRole -> UserRole, you just send a small message from view, and then in your update bit handling the message, you look at the model to pick off the matrix of permissions and resources. | 2019-02-15T12:56:10.499000 | Dede |
elmlang | general | `view = ... button [onClick = SetUserRoleClicked]` | 2019-02-15T12:56:33.499200 | Dede |
elmlang | general | `update = ... case SetUserRoleClicked -> ({model | user = {model.user | role = UserRole (computePermissionsFromModel model)...` | 2019-02-15T12:57:19.499400 | Dede |
elmlang | general | ok, guess I will have to make another go on that | 2019-02-15T13:04:43.499600 | Floy |
elmlang | general | thanks for time that you spent with me :+1: | 2019-02-15T13:04:58.499800 | Floy |
elmlang | general | Hi all! I'm having a problem with the newUrl function in the deprecated Navigation module. I need to navigate to an external url and it doesn't work. I tried the sample from <https://github.com/sircharleswatson/elm-navigation-example> which is perfectly working, changed the url parameter of the newUrl function to "<http://google.com>" in the update.elm file and the links are now not working. What am I doing wrong? | 2019-02-15T14:02:12.504700 | Zaida |
elmlang | general | Yes, I have package `elm-tar`. Does tar without compression. There are two functions, `createArchive` and `extractArchive`. There is a bug in the latter which hope to have fixed in the next day or two. (It sometimes leaves trailing null bytes_. | 2019-02-15T21:10:53.505800 | Jana |
elmlang | general | Hi all, is there an editable tree view library available in Elm on Github? I mean a way to add or delete nodes to a tree via UI. | 2019-02-16T03:57:17.506200 | Stormy |
elmlang | general | Hi all,
a question about `Browser.Event.on`
As we are living in the virtual dom, creating a load event is not possible. Am I right?
I have this custom event:
```
onLoad : msg -> Attribute msg
onLoad message =
on "load" (Decode.succeed message)
```
and run it in my renderer:
```
section
[ class "hscroller"
, onLoad (Init identifier)
]
```
and have properly set up the message in my update function.
But the message is not send… so: Am I’m doing something wrong, or not possible at all | 2019-02-16T04:52:48.509800 | Cathey |
elmlang | general | Not all elements dispatch the onload event <https://www.w3schools.com/jsref/event_onload.asp> | 2019-02-16T04:54:02.509900 | Lea |
elmlang | general | These do `<body>, <frame>, <iframe>, <img>, <input type="image">, <link>, <script>, <style>` | 2019-02-16T04:54:16.510200 | Lea |
elmlang | general | oh! crazy… had a look in the MDN documentation and they said: Element… so did not know. that. Thanks for the hint! | 2019-02-16T04:55:18.510400 | Cathey |
elmlang | general | yeah, it only works on element for which 'load' is meaningful. ie. an img tag can load it's src image. | 2019-02-16T04:56:39.510800 | Earlean |
elmlang | general | `<section>` has nothing to load | 2019-02-16T04:56:50.511000 | Earlean |
elmlang | general | hmm… ok then. Well I probably have a more archittectural problem. I want to do some initializationo stuff during runtim of my app. So not on launch. Because the initialization stuff triggers some Dom.getViewportOf, which can only be determined, when it exists… | 2019-02-16T05:00:40.511200 | Cathey |
elmlang | general | You can do that in `init`, the functions in `Browser.Dom` will wait for the next animation frame | 2019-02-16T05:04:16.511400 | Earlean |
elmlang | general | You mean `Browser.application.init`? | 2019-02-16T05:06:48.511600 | Cathey |
elmlang | general | It not possible to do it there, as this is only triggered once on app launnch… i thought…:thinking_face: | 2019-02-16T05:07:50.511900 | Cathey |
elmlang | general | yes, it is. | 2019-02-16T05:08:13.512200 | Earlean |
elmlang | general | if you're not doing it at initialisation then you're doing it in `update` | 2019-02-16T05:08:33.512400 | Earlean |
elmlang | general | yes. I would do it in my update function. But I need a Msg to trigger that update function, right? | 2019-02-16T05:09:46.512600 | Cathey |
elmlang | general | yep, but you need a `Msg` to `update` for the `view` to change at all | 2019-02-16T05:10:37.512800 | Earlean |
elmlang | general | So as soon as it’s rendered, it should throw a message to do stuff … | 2019-02-16T05:10:51.513000 | Cathey |
elmlang | general | since the `view` only represents the `model` and you can't change the `model` except in response to some event | 2019-02-16T05:11:06.513200 | Earlean |
elmlang | general | before any element is rendered in the `view` there was an event that updated to `model` to a state that would result in that element being rendered in the `view`, that is when you do it. | 2019-02-16T05:12:15.513400 | Earlean |
elmlang | general | exactly. So I need an event first. And I thought the `load`would do it, but that is not triggered according to the specs… | 2019-02-16T05:12:26.513600 | Cathey |
elmlang | general | I can make a port and subscribe to that… but thats some kind of ugly… | 2019-02-16T05:13:21.513900 | Cathey |
elmlang | general | what `model` change results in you displaying that `section` element? | 2019-02-16T05:13:51.514200 | Earlean |
elmlang | general | what event results in the `model` being in that state? | 2019-02-16T05:14:38.514400 | Earlean |
elmlang | general | ```
Init id ->
let
_ =
Debug.log "initialized hScroller" id
in
( hScroller
, Cmd.batch
[ Random.generate
NewRandom
(<http://Random.int|Random.int> 0 2)
, Dom.getViewportOf id
|> Task.andThen (\_ -> setViewportToX id hScroller.viewport.viewport.x)
|> Task.attempt (\_ -> NoOp)
]
)
``` | 2019-02-16T05:14:42.514600 | Cathey |
elmlang | general | there are no `model` changes there | 2019-02-16T05:15:25.514800 | Earlean |
elmlang | general | I basically want to check the size of the section. with CMD | 2019-02-16T05:15:38.515000 | Cathey |
elmlang | general | in response to what? | 2019-02-16T05:15:56.515200 | Earlean |
elmlang | general | so no model update. I have to trigger some Cmd’s first, and those responses will update my model then… | 2019-02-16T05:16:06.515400 | Cathey |
elmlang | general | Yes that’s the problem. It should be the response of “that the sectino is now rendered and availlable”… | 2019-02-16T05:17:27.515600 | Cathey |
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