alexcastano
Get field names of a struct
Hello,
Is there a way to get the list of fields with only the struct module?
iex> something(Date)
[:calendar, :year, :day, :month]
I tried this, but it doesn’t work if @enforce_keys are defined:
iex(4)> Map.keys(%Date{})
** (ArgumentError) the following keys must also be given when building struct Date: [:year, :month, :day]
(elixir) expanding struct: Date.__struct__/1
iex:4: (file)
At first glance it does not seem that any function is created for this either:
Marked As Solved
LostKobrakai
This seems to work:
iex(2)> Date.__struct__() |> Map.keys()
[:__struct__, :calendar, :day, :month, :year]
5
Also Liked
krisleech
This seems to work for any struct:
struct(Foo, %{}) |> Map.from_struct() |> Map.keys()
2
Popular in Questions
Hello, can anybody help here..? I have a list of players and I what to delete an element, but every for loop the list is reverting to ori...
New
I have an umbrella app.
Some of the apps inside depend on other apps in the umbrella, unsurprisingly.
I’m writing a test for one of the...
New
can someone please explain to me how Enum.reduce works with maps
New
What is the difference between System.get_env and Application.get_env? For example, what are best practices to use one versus another.
New
Could someone help me? I’m making my first elixir program, number guessing game. I can’t figure out how to convert the user’s guess from ...
New
Hello, I have map which I want to convert it to string like this:
the map:
%{last_name: "tavakkoli", name: "shahryar"}
the string I ne...
New
Using vs code and installed ElixirLS: support and debugger.
And I got an error popped up on start up says
Failed to run ‘elixir’ comma...
New
Okay, I’m having a heck of a time trying to figure out how to best handle the validation of belongs_to associations in Ecto. I’m sure I’...
New
In the Dialyzer docs ( dialyzer — OTP 29.0.2 (dialyzer 6.0.1) ), there is a way to turn off a specific warning for a function:
-dialyzer...
New
Hello!
Sorry for this astonishing simple question, but I’m really stuck. I try to set up the intellij-elixir plugin, but I don’t know ho...
New
Other popular topics
Hi All,
I set a environment variables in dev.exs , like below code.
when i start server, how can i set the ${enable} value?
thanks.
d...
New
Hi,
I am new to Elixir. I am trying to use the DateTime component to insert a date into MySQL however the there seems to be no way to fo...
New
Hello, I have map which I want to convert it to string like this:
the map:
%{last_name: "tavakkoli", name: "shahryar"}
the string I ne...
New
This release brings a number of exciting features, including integration with the new Phoenix LiveDashboard and Phoenix LiveView. There h...
New
I want to highlight html closing tags when i click a html tag. That works in .html files but doesnt work for html.eex templates. How can...
New
Hello everybody,
usually, I use a 29" ultra-wide monitor for VSCode which can easily accomodate explorer (files panel) + file with code ...
New
Using vs code and installed ElixirLS: support and debugger.
And I got an error popped up on start up says
Failed to run ‘elixir’ comma...
New
I tried installing
elixir 1.11.2
erlang 23.3.4
via asdf in my zsh shell. Enabled the versions locally and globally.
When I list them ...
New
Credo is smart enough to check for (something like) this:
assert length(the_list) == 0
with this response:
Checking if an enum is empt...
New
In the code below, if the create action is not set to accept “extra_key” as an input, it errors out with a message shown above. Is there ...
New
Latest on Elixir Forum
Sponsor Spotlight
Build Elixir applications with speed and confidence.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #deployment
- #library
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #channels
- #elixirconf
- #exunit
- #discussion
- #code-sync
- #javascript
- #podcasts
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #elixir-ls
- #phoenix_html
- #iex
- #blog-post
- #graphql
- #genstage
- #ai
- #websockets
- #supervisor
- #advent-of-code
- #elixirconf-us
- #distillery
- #processes
- #forms
- #api
- #metaprogramming
- #security
- #performance
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Real-time error tracking, performance insights, and observability for devs.
Producing high quality Elixir screencasts since 2017.
Enabling companies to succeed by building software people love.
The deployment platform built for Elixir: PaaS ease, VPS control.
Courses that'll move you from confusion to "Aha, now I get it!"