JimmyCarterSon

JimmyCarterSon

Troubleshooting Code: (KeyError) key :changeset not found

I am following this tutorial . I have followed carefully correcting errors as I go. The app allows you to create a blog post and add comments if you so choose. When I click show Posts, this error I am getting:

[error] #PID<0.581.0> running BlogAppWeb.Endpoint (connection #PID<0.552.0>, stream id 6) terminated
Server: localhost:4000 (http)
Request: GET /posts/1
** (exit) an exception was raised:
    ** (KeyError) key :changeset not found in: %{conn: %Plug.Conn{adapter: {Plug.Cowboy.Conn, :...}, assigns: %{layout: {BlogAppWeb.LayoutView, "app.html"}, post: %BlogApp.Posts.Post{__meta__: #Ecto.Schema.Metadata<:loaded, "posts">, body: "This here is my duck named Mr.Lump My friend Anum is here.", comments: #Ecto.Association.NotLoaded<association :comments is not loaded>, id: 1, inserted_at: ~N[2022-03-17 17:38:18], title: "Look at my Duck, his name is Lump", updated_at: ~N[2022-03-18 17:45:40]}}, body_params: %{}, cookies: %{"_blog_app_key" => "SFMyNTY.g3QAAAABbQAAAAtfY3NyZl90b2tlbm0AAAAYSjBybkJSX2U0ZHVyalNoLVkzeHhCdlRt.wbQhUfCTv_8d1yKDupYSNN_ewiSgDMVBypamZHRIP1o", "_live_view_todos_key" => "SFMyNTY.g3QAAAABbQAAAAtfY3NyZl90b2tlbm0AAAAYWWJ1XzE5MnJSSkV6OVl3eVl0cUpvM2pN.NJYDbH-n7JlaQFMHL2_x-T2zhhvyYD6XBmo8GequxP8"}, halted: false, host: "localhost", method: "GET", owner: #PID<0.581.0>, params: %{"id" => "1"}, path_info: ["posts", "1"], path_params: %{"id" => "1"}, port: 4000, private: %{BlogAppWeb.Router => {[], %{Plug.Swoosh.MailboxPreview => ["mailbox"]}}, :before_send => [#Function<0.16477574/1 in Plug.CSRFProtection.call/2>, #Function<2.17183421/1 in Phoenix.Controller.fetch_flash/2>, #Function<0.77458138/1 in Plug.Session.before_send/2>, #Function<0.23023616/1 in Plug.Telemetry.call/2>, #Function<1.46227650/1 in Phoenix.LiveReloader.before_send_inject_reloader/3>], :phoenix_action => :show, :phoenix_controller => BlogAppWeb.PostController, :phoenix_endpoint => BlogAppWeb.Endpoint, :phoenix_flash => %{}, :phoenix_format => "html", :phoenix_layout => {BlogAppWeb.LayoutView, :app}, :phoenix_request_logger => {"request_logger", "request_logger"}, :phoenix_root_layout => {BlogAppWeb.LayoutView, :root}, :phoenix_router => BlogAppWeb.Router, :phoenix_template => "show.html", :phoenix_view => BlogAppWeb.PostView, :plug_session => %{"_csrf_token" => "J0rnBR_e4durjSh-Y3xxBvTm"}, :plug_session_fetch => :done}, query_params: %{}, query_string: "", remote_ip: {127, 0, 0, 1}, req_cookies: %{"_blog_app_key" => "SFMyNTY.g3QAAAABbQAAAAtfY3NyZl90b2tlbm0AAAAYSjBybkJSX2U0ZHVyalNoLVkzeHhCdlRt.wbQhUfCTv_8d1yKDupYSNN_ewiSgDMVBypamZHRIP1o", "_live_view_todos_key" => "SFMyNTY.g3QAAAABbQAAAAtfY3NyZl90b2tlbm0AAAAYWWJ1XzE5MnJSSkV6OVl3eVl0cUpvM2pN.NJYDbH-n7JlaQFMHL2_x-T2zhhvyYD6XBmo8GequxP8"}, req_headers: [{"accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9"}, {"accept-encoding", "gzip, deflate, br"}, {"accept-language", "en-US,en;q=0.9"}, {"connection", "keep-alive"}, {"cookie", "_live_view_todos_key=SFMyNTY.g3QAAAABbQAAAAtfY3NyZl90b2tlbm0AAAAYWWJ1XzE5MnJSSkV6OVl3eVl0cUpvM2pN.NJYDbH-n7JlaQFMHL2_x-T2zhhvyYD6XBmo8GequxP8; _blog_app_key=SFMyNTY.g3QAAAABbQAAAAtfY3NyZl90b2tlbm0AAAAYSjBybkJSX2U0ZHVyalNoLVkzeHhCdlRt.wbQhUfCTv_8d1yKDupYSNN_ewiSgDMVBypamZHRIP1o"}, {"host", "localhost:4000"}, {"referer", "http://localhost:4000/posts"}, {"sec-ch-ua", "\" Not A;Brand\";v=\"99\", \"Chromium\";v=\"98\", \"Google Chrome\";v=\"98\""}, {"sec-ch-ua-mobile", "?0"}, {"sec-ch-ua-platform", "\"macOS\""}, {"sec-fetch-dest", "document"}, {"sec-fetch-mode", "navigate"}, {"sec-fetch-site", "same-origin"}, {"sec-fetch-user", "?1"}, {"upgrade-insecure-requests", "1"}, {"user-agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36"}], request_path: "/posts/1", resp_body: nil, resp_cookies: %{}, resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"}, {"x-request-id", "Ft5qQ01M_yh3344AAAAE"}, {"x-frame-options", "SAMEORIGIN"}, {"x-xss-protection", "1; mode=block"}, {"x-content-type-options", "nosniff"}, {"x-download-options", "noopen"}, {"x-permitted-cross-domain-policies", "none"}, {"cross-origin-window-policy", "deny"}], scheme: :http, script_name: [], secret_key_base: :..., state: :unset, status: nil}, post: %BlogApp.Posts.Post{__meta__: #Ecto.Schema.Metadata<:loaded, "posts">, body: "This here is my duck named Mr.Lump My friend Anum is here.", comments: #Ecto.Association.NotLoaded<association :comments is not loaded>, id: 1, inserted_at: ~N[2022-03-17 17:38:18], title: "Look at my Duck, his name is Lump", updated_at: ~N[2022-03-18 17:45:40]}}
        (blog_app 0.1.0) lib/blog_app_web/templates/post/show.html.heex:19: anonymous fn/2 in BlogAppWeb.PostView."show.html"/1
        (phoenix_live_view 0.17.7) lib/phoenix_live_view/engine.ex:124: Phoenix.HTML.Safe.Phoenix.LiveView.Rendered.to_iodata/1
        (phoenix_live_view 0.17.7) lib/phoenix_live_view/engine.ex:140: Phoenix.HTML.Safe.Phoenix.LiveView.Rendered.to_iodata/3
        (phoenix 1.6.6) lib/phoenix/controller.ex:772: Phoenix.Controller.render_and_send/4
        (blog_app 0.1.0) lib/blog_app_web/controllers/post_controller.ex:1: BlogAppWeb.PostController.action/2
        (blog_app 0.1.0) lib/blog_app_web/controllers/post_controller.ex:1: BlogAppWeb.PostController.phoenix_controller_pipeline/2
        (phoenix 1.6.6) lib/phoenix/router.ex:355: Phoenix.Router.__call__/2
        (blog_app 0.1.0) lib/blog_app_web/endpoint.ex:1: BlogAppWeb.Endpoint.plug_builder_call/2
        (blog_app 0.1.0) lib/plug/debugger.ex:136: BlogAppWeb.Endpoint."call (overridable 3)"/2
        (blog_app 0.1.0) lib/blog_app_web/endpoint.ex:1: BlogAppWeb.Endpoint.call/2
        (phoenix 1.6.6) lib/phoenix/endpoint/cowboy2_handler.ex:54: Phoenix.Endpoint.Cowboy2Handler.init/4
        (cowboy 2.9.0) /Users/shansiddiqui/Desktop/blog_app/deps/cowboy/src/cowboy_handler.erl:37: :cowboy_handler.execute/2
        (cowboy 2.9.0) /Users/shansiddiqui/Desktop/blog_app/deps/cowboy/src/cowboy_stream_h.erl:306: :cowboy_stream_h.execute/3
        (cowboy 2.9.0) /Users/shansiddiqui/Desktop/blog_app/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

This error is coming when I Get Posts, also I cant show posts? Any Idea to go around this

9 2226 3

Marked As Solved

dimitarvp

dimitarvp

Since that’s an exercise I believe there’s no harm if you post it publicly on GitHub and link it here. Maybe the tutorial is stale, maybe it made a small error (or maybe you did).

In any case yeah, there’s no Ecto.Changeset in the object that’s being consulted nor there should be so there’s code that’s looking at the wrong place.

Also Liked

JimmyCarterSon

JimmyCarterSon

I actually did find the answer I combed the code and found that there were two functions. I am running into a new error that is confusing me!

Now I have a new error compile error. The function does exist but, cannot be found.Do you think it was to do with the alias (referencing) the component?

Error:

== Compilation error in file lib/blog_app_web/views/post_view.ex ==
** (CompileError) lib/blog_app_web/views/post_view.ex:2: module BlogWeb is not loaded and could not be found
    (elixir 1.13.3) expanding macro: Kernel.use/2
    lib/blog_app_web/views/post_view.ex:2: BlogWeb.PostView (module)

Post_view.ex:

defmodule BlogWeb.PostView do
	use BlogWeb, :view
	alias BlogApp.Posts

	def get_comments_count(post_id) do
		Posts.get_number_of_comments(post_id)
	end
end
dimitarvp

dimitarvp

Look for which module in your app defines a view function e.g.

defmodule YourModule do
  dev view do
    # ...
  end
end

In your case it should be BlogWeb but who knows, maybe it’s another one.

Where Next?

Popular Backend topics Top

Kurisu
Hello, Please, let’s say I have a website with user authentication made with Elixir/Phoenix, and now want to add a forum to it (using a ...
11 740 3
New
dimitarvp
As a part of my new job I’ll have to learn to manage a local k8s cluster. The tools used are microk8s, tilt and helm. I’ll appreciate an...
25 857 10
New
pillaiindu
Cross posting from HashNode. A friend of mine is creating Uber-like app for a small company with 200 to 1000 cars. The app will operate ...
13 1377 6
New
andrea
Can Phoenix LiveView be used in multi-page applications, unlike React/Vue/Blazor which seems to be targeted for SPA?
6 2432 4
New
bsek43
Hello everyone, I’ve started learning Elixir and Phoenix few months ago and while I mostly grasped Elixir’s functional concepts and Phoe...
10 1239 3
New
Fl4m3Ph03n1x
Background I am trying out polymorphic typing with dialyzer. As an example I am using the famous Option type (aka, Maybe Monad) that is n...
20 1310 8
New
jeya
Dear Geeks I am new to pytest. I am following a youtube channel. I am writing the same code. learning to test login functionality of an...
23 1514 12
New
sona11
I studied very basic PHP (I believe). After that, I feel like I’ve gotten a handle on the language. My dream is to work as a web develope...
9 921 2
New
harwind
I have a large SQL database with millions of records, and I’ve identified duplicate entries. What’s the most efficient way to find and re...
1 398 0
New
Fl4m3Ph03n1x
Background I have an umbrella app where I use a dependecy called ETS. This dependency has a type called set_options that I use in some of...
2 445 1
New

Other popular topics Top

AstonJ
poll poll Be sure to check out @Dusty’s article posted here: An Introduction to Alternative Keyboard Layouts It’s one of the best write-...
10 5348 11
New
AstonJ
I have seen the keycaps I want - they are due for a group-buy this week but won’t be delivered until October next year!!! :rofl: The Ser...
9 4393 7
New
PragmaticBookshelf
“Finding the Boundaries” Hero’s Journey with Noel Rappin @noelrappin Even when you’re ultimately right about what the future ho...
34 3841 21
New
Margaret
Hello content creators! Happy new year. What tech topics do you think will be the focus of 2021? My vote for one topic is ethics in tech...
110 3900 43
New
Exadra37
I am asking for any distro that only has the bare-bones to be able to get a shell in the server and then just install the packages as we ...
66 21694 24
New
gagan7995
API 4 Path: /user/following/ Method: GET Description: Returns the list of all names of people whom the user follows Response [ { ...
7 3059 3
New
Help
I am trying to crate a game for the Nintendo switch, I wanted to use Java as I am comfortable with that programming language. Can you use...
8 3528 3
New
First poster: bot
The overengineered Solution to my Pigeon Problem. TL;DR: I built a wifi-equipped water gun to shoot the pigeons on my balcony, controlle...
0 4367 0
New
AstonJ
If you want a quick and easy way to block any website on your Mac using Little Snitch simply… File &gt; New Rule: And select Deny, O...
5 8045 3
New
PragmaticBookshelf
Author Spotlight: Bruce Tate @redrapids Programming languages always emerge out of need, and if that’s not always true, they’re defin...
54 4591 23
New