Learning the hard way makes you learn a whole bunch more than simply copy / pasting, or typing out what you see on the book pages.This took me an embarrassingly long time to figure out. With the outcome of the next form submission: INSERT INTO "videos" ("category_id","description","title","url","user_id","inserted_at","updated_at") VALUES ($1,$2,$3,$4,$5,$6,$7).
Elixir ecto changeset code#
My replacement code started off like this: def changeset(struct, params \\ %) do We’ve gone from having required and optional fields, to simply just allowed fields. Maybe ‘intellisense’ has made me overly lazy.Īnyway, all of this is nice to know but it’s not directly addressing ‘problem’ I faced (and I use the inverted commas there as this isn’t a problem, it’s my lack of understanding). With PHPStorm I’m so used to having the code-completion and method signature look ups (cmd+p on mac) that learning and remembering all this stuff is really the hardest part. This is one of the benefits, and drawbacks (when learning) of Elixir, in my experience. Ok, so lots of things happening here in a very little amount of code. Using the ~w sigil is a way to create a list from the given string. One nice thing happening in the original code is the use of Attributes ( as constants. |> cast(params, seen in the code from the Programming Phoenix book, cast/3 expects some params, then a list of required_fields, and another list of optional_fields. Really there are four, though one is being passed in as the first argument by way of Elixir’s pipe operator – which passes the outcome of the previous statement into the first argument of the next: model You may then be wondering why in the original code from the book then that we only have three arguments being passed in? Here’s the signature: cast(data, params, allowed)Īnd here’s the signature for cast/4 : cast(data, params, required, optional) The suggested replacement: cast/3 ( docs) is where my confusion started. Seeing as I made the commitment to using the newer functions, this seemed like as good a time as any to do so. (rumbl) web/controllers/video_controller.ex:1: _controller_pipeline/2 (rumbl) web/controllers/video_controller.ex:1: /2
(rumbl) web/controllers/video_controller.ex:33: /3 |> cast(params, using this code I got a deprecation warning: warning: `/4` is deprecated, please use `cast/3` + `validate_required/3` instead Ok, so in the book on page 99 (Chapter 6: Building Relationships), there is the following code: ~w(url title ~w(category_id)ĭef changeset(model, params \\ :empty) do I’m aware the book was written for an earlier version of Phoenix, and in an attempt to force myself to “learn the hard way”, I decided that whenever I hit on a deprecated function, I would use the given replacement. I got to chapter 7, and got myself quite stuck. That’s not to say it’s all plain sailing. I’m currently working my way through the Programming Phoenix book, which I have to say, I am thoroughly enjoying. How I Fixed: Gatsby GraphQL Cannot query field “query” on type “Query”.How I Fixed: Electron builder rcedit-圆4.exe”: file does not exist July 25, 2020.Is the docker daemon running? June 19, 2021 How I Solved: Cannot connect to the Docker daemon at tcp://dind:2375.How I Fixed: Error response from daemon: Get : unauthorized: HTTP Basic: Access denied June 19, 2021.How I Fixed: cannot access ‘java.io.serializable’ which is a supertype of ‘kotlin.int’ June 28, 2021.How I Fixed: Kotlin Spring Boot Auto Reload in IntelliJ IDEA July 17, 2021.How I Fixed: unknown flag: –project-name in GitHub Actions August 6, 2021.How I Fixed: docker: Error response from daemon: Decoding seccomp profile failed: json: cannot unmarshal array into Go value of type seccomp.Seccomp.Please check Mono settings under File | Settings | Build, Execution, Deployment | Toolset and Build September 9, 2021 How I Fixed: Mono location is not specified in settings correctly and can not be discovered automatically.How I Fixed: Error: The number of path segments is not divisible by 2 in “” November 16, 2021.Figueroa on How I Fixed: ACF REST API cant_update_item.Lisa on Using ReactCSSTransitionGroup with TypeScript.Or maybe you meant to call this function rather than return it. This may happen if you return a Component instead of from render. Coco on How I Fixed: React Native – Warning: Functions are not valid as a React child.Justin Hampton on Ubuntu 20.04 Portrait Mode Monitor Problems.
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