Hello,
I want to calculate age of the user in a template, I tried to use:
<%= Date.diff(Date.utc_today(), user.birth) %>
But in that case user.birth returns nill, but when I put in a bracket like that
<%= Date.diff(Date.utc_today(), {user.birth}) %>
It gives me an error but the date is visible (in a bracket).
How can I solve it?
Please add the error you’re seeing as well.
no function clause matching in Date.diff/2
# FunctionClauseError at GET /users
Exception:
** (FunctionClauseError) no function clause matching in Date.diff/2
(elixir 1.12.2) lib/calendar/date.ex:685: Date.diff(~D[2023-02-03], nil)
(venue 0.1.0) lib/venue_web/templates/users/index.html.heex:10: anonymous fn/3 in VenueWeb.UsersView."index.html"/1
(elixir 1.12.2) lib/enum.ex:2385: Enum."-reduce/3-lists^foldl/2-0-"/3
(venue 0.1.0) lib/venue_web/templates/users/index.html.heex:2: anonymous fn/2 in VenueWeb.UsersView."index.html"/1
(phoenix_live_view 0.17.12) lib/phoenix_live_view/engine.ex:124: Phoenix.HTML.Safe.Phoenix.LiveView.Rendered.to_iodata/1
(phoenix_live_view 0.17.12) lib/phoenix_live_view/engine.ex:140: Phoenix.HTML.Safe.Phoenix.LiveView.Rendered.to_iodata/3
(phoenix 1.6.15) lib/phoenix/controller.ex:772: Phoenix.Controller.render_and_send/4
(venue 0.1.0) lib/venue_web/controllers/users_controller.ex:1: VenueWeb.UsersController.action/2
(venue 0.1.0) lib/venue_web/controllers/users_controller.ex:1: VenueWeb.UsersController.phoenix_controller_pipeline/2
(phoenix 1.6.15) lib/phoenix/router.ex:354: Phoenix.Router.__call__/2
(venue 0.1.0) lib/venue_web/endpoint.ex:1: VenueWeb.Endpoint.plug_builder_call/2
(venue 0.1.0) lib/plug/debugger.ex:136: VenueWeb.Endpoint."call (overridable 3)"/2
(venue 0.1.0) lib/venue_web/endpoint.ex:1: VenueWeb.Endpoint.call/2
(phoenix 1.6.15) lib/phoenix/endpoint/cowboy2_handler.ex:54: Phoenix.Endpoint.Cowboy2Handler.init/4
(cowboy 2.9.0) /home/zervis/Dokumenty/GitHub/venue/deps/cowboy/src/cowboy_handler.erl:37: :cowboy_handler.execute/2
(cowboy 2.9.0) /home/zervis/Dokumenty/GitHub/venue/deps/cowboy/src/cowboy_stream_h.erl:306: :cowboy_stream_h.execute/3
(cowboy 2.9.0) /home/zervis/Dokumenty/GitHub/venue/deps/cowboy/src/cowboy_stream_h.erl:295: :cowboy_stream_h.request_process/3
(stdlib 3.17) proc_lib.erl:226: :proc_lib.init_p_do_apply/3
Code:
`lib/calendar/date.ex`
No code available.
Called with 2 arguments
* `~D[2023-02-03]`
* `nil`
Attempted function clauses (showing 2 out of 2)
def diff(%{calendar: Calendar.ISO} = date1, %{calendar: Calendar.ISO} = date2)
def diff(%{calendar: calendar1} = date1, %{calendar: calendar2} = date2)
`lib/venue_web/templates/users/index.html.heex`
5 <%= user.email %>
6 <% end %>
7
8 <%= img_tag Venue.Avatar.url({user.avatar, user}, :thumb, signed: true) %>
9
10> <%= Date.diff(Date.utc_today(), user.birth) %>
11 <%= user.birth %>
12 <%= user.desc %>
13
14 <%= trunc(Geocalc.distance_between(user.geom.coordinates, @current_user.geom.coordinates) / 1000) %> km <br>
15
`lib/enum.ex`
No code available.
`lib/venue_web/templates/users/index.html.heex`
1 <%= if @current_user do %>
2> <%= for user <- @users do %>
3
4 <%= link to: Routes.users_path(@conn, :show, user.id) do %>
5 <%= user.email %>
6 <% end %>
7
`lib/phoenix_live_view/engine.ex`
119 root: nil | true | false
120 }
121
122 defimpl Phoenix.HTML.Safe do
123 def to_iodata(%Phoenix.LiveView.Rendered{static: static, dynamic: dynamic}) do
124> to_iodata(static, dynamic.(false), [])
125 end
126
127 def to_iodata(%_{} = struct) do
128 Phoenix.HTML.Safe.to_iodata(struct)
129 end
`lib/phoenix_live_view/engine.ex`
135 def to_iodata(other) do
136 other
137 end
138
139 defp to_iodata([static_head | static_tail], [dynamic_head | dynamic_tail], acc) do
140> to_iodata(static_tail, dynamic_tail, [to_iodata(dynamic_head), static_head | acc])
141 end
142
143 defp to_iodata([static_head], [], acc) do
144 Enum.reverse([static_head | acc])
145 end
`lib/phoenix/controller.ex`
767 Map.get(conn.private, :phoenix_view) ||
768 raise "a view module was not specified, set one with put_view/2"
769
770 layout_format? = format in layout_formats(conn)
771 conn = prepare_assigns(conn, assigns, template, format, layout_format?)
772> data = render_with_layouts(conn, view, template, format, layout_format?)
773
774 conn
775 |> ensure_resp_content_type(MIME.type(format))
776 |> send_resp(conn.status || 200, data)
777 end
`lib/venue_web/controllers/users_controller.ex`
1> defmodule VenueWeb.UsersController do
2 use VenueWeb, :controller
3
4 alias Venue.Users
5 alias VenueWeb.UserAuth
6 alias Venue.Events
`lib/venue_web/controllers/users_controller.ex`
1> defmodule VenueWeb.UsersController do
2 use VenueWeb, :controller
3
4 alias Venue.Users
5 alias VenueWeb.UserAuth
6 alias Venue.Events
`lib/phoenix/router.ex`
349 metadata = %{metadata | conn: halted_conn}
350 :telemetry.execute([:phoenix, :router_dispatch, :stop], measurements, metadata)
351 halted_conn
352 %Plug.Conn{} = piped_conn ->
353 try do
354> plug.call(piped_conn, plug.init(opts))
355 else
356 conn ->
357 measurements = %{duration: System.monotonic_time() - start}
358 metadata = %{metadata | conn: conn}
359 :telemetry.execute([:phoenix, :router_dispatch, :stop], measurements, metadata)
`lib/venue_web/endpoint.ex`
1> defmodule VenueWeb.Endpoint do
2 use Phoenix.Endpoint, otp_app: :venue
3
4 # The session will be stored in the cookie and signed,
5 # this means its contents can be read but not tampered with.
6 # Set :encryption_salt if you would also like to encrypt it.
`lib/plug/debugger.ex`
No code available.
`lib/venue_web/endpoint.ex`
1> defmodule VenueWeb.Endpoint do
2 use Phoenix.Endpoint, otp_app: :venue
3
4 # The session will be stored in the cookie and signed,
5 # this means its contents can be read but not tampered with.
6 # Set :encryption_salt if you would also like to encrypt it.
`lib/phoenix/endpoint/cowboy2_handler.ex`
49 end
50
51 {:plug, conn, handler, opts} ->
52 %{adapter: {@connection, req}} =
53 conn
54> |> handler.call(opts)
55 |> maybe_send(handler)
56
57 {:ok, req, {handler, opts}}
58 end
59 catch
`/home/zervis/Dokumenty/GitHub/venue/deps/cowboy/src/cowboy_handler.erl`
32 -optional_callbacks([terminate/3]).
33
34 -spec execute(Req, Env) -> {ok, Req, Env}
35 when Req::cowboy_req:req(), Env::cowboy_middleware:env().
36 execute(Req, Env=#{handler := Handler, handler_opts := HandlerOpts}) ->
37> try Handler:init(Req, HandlerOpts) of
38 {ok, Req2, State} ->
39 Result = terminate(normal, Req2, State, Handler),
40 {ok, Req2, Env#{result => Result}};
41 {Mod, Req2, State} ->
42 Mod:upgrade(Req2, Env, Handler, State);
`/home/zervis/Dokumenty/GitHub/venue/deps/cowboy/src/cowboy_stream_h.erl`
301 end.
302
303 execute(_, _, []) ->
304 ok;
305 execute(Req, Env, [Middleware|Tail]) ->
306> case Middleware:execute(Req, Env) of
307 {ok, Req2, Env2} ->
308 execute(Req2, Env2, Tail);
309 {suspend, Module, Function, Args} ->
310 proc_lib:hibernate(?MODULE, resume, [Env, Tail, Module, Function, Args]);
311 {stop, _Req2} ->
`/home/zervis/Dokumenty/GitHub/venue/deps/cowboy/src/cowboy_stream_h.erl`
290 %% to simplify the debugging of errors. The proc_lib library
291 %% already adds the stacktrace to other types of exceptions.
292 -spec request_process(cowboy_req:req(), cowboy_middleware:env(), [module()]) -> ok.
293 request_process(Req, Env, Middlewares) ->
294 try
295> execute(Req, Env, Middlewares)
296 catch
297 exit:Reason={shutdown, _}:Stacktrace ->
298 erlang:raise(exit, Reason, Stacktrace);
299 exit:Reason:Stacktrace when Reason =/= normal, Reason =/= shutdown ->
300 erlang:raise(exit, {Reason, Stacktrace}, Stacktrace)
`proc_lib.erl`
No code available.
## Connection details
### Params
%{}
### Request info
* URI: http://localhost:4000/users
* Query string:
### Headers
* accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
* accept-encoding: gzip, deflate, br
* accept-language: pl,en-US;q=0.7,en;q=0.3
* connection: keep-alive
* cookie: _venue_key=SFMyNTY.g3QAAAADbQAAAAtfY3NyZl90b2tlbm0AAAAYTVpENTdrX0NyMWNiRTZvUWhwLTE2NlZObQAAAA5saXZlX3NvY2tldF9pZG0AAAA7dXNlcnNfc2Vzc2lvbnM6VWJPVW5pMXJMZ3JabVJqbUNwSnNFeUk5MGtaOGFLTDRrTmpEU1g5cDNhND1tAAAACnVzZXJfdG9rZW5tAAAAIFGzlJ4tay4K2ZkY5gqSbBMiPdJGfGii-JDYw0l_ad2u.Ywj13HQxgpyztHM1QCUMuKAYCRpf3iZCf-RAGsz0X2w
* host: localhost:4000
* referer: http://localhost:4000/
* sec-fetch-dest: document
* sec-fetch-mode: navigate
* sec-fetch-site: same-origin
* upgrade-insecure-requests: 1
* user-agent: Mozilla/5.0 (X11; Linux x86_64; rv:103.0) Gecko/20100101 Firefox/103.0
### Session
%{"_csrf_token" => "MZD57k_Cr1cbE6oQhp-166VN", "live_socket_id" => "users_sessions:UbOUni1rLgrZmRjmCpJsEyI90kZ8aKL4kNjDSX9p3a4=", "user_token" => <<81, 179, 148, 158, 45, 107, 46, 10, 217, 153, 24, 230, 10, 146, 108, 19, 34, 61, 210, 70, 124, 104, 162, 248, 144, 216, 195, 73, 127, 105, 221, 174>>}
lib/calendar/date.ex
'''
'''
Date.diff/2
Called with 2 arguments
~D[2023-02-03]
nil
Attempted function clauses (showing 2 out of 2)
def diff(%{calendar: Calendar.ISO} = date1, %{calendar: Calendar.ISO} = date2) def diff(%{calendar: calendar1} = date1, %{calendar: calendar2} = date2)
'''Date.diff/2 requires both parameters to be %DateTime{} structs. user.birth seems to be nil.
Ha, I know why. Some of users didn’t have date in their profile.
Thanks!
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