Background I am trying to create a schema with some basic validations. However, when I spin up my app, it looks like the validations are not running. Code This is the schema for a reservation. defmodule MyApp.Reserve do @moduledoc """ Represents a reservation for a guest. """ use Ecto.Sch…

To have Ecto.Changeset work as designed you should give it an empty %Reserve{} and then pass parameters in the form of a regular map that contain all the pieces of data you want validated. Or a mix.

The changes will be validated and you may see errors after “applying an action” - it can be e.g. when you call Repo to insert or update, or if you need to you can call apply_action/2 yourself edit: also, if you’re making changes to a struct you would pass the changes in the params map - and those w…

[image] michallepicki: The changes will be validated and you may see errors after “applying an action” That’s not the issue. Validations run at the time the validation function is called. [image] Fl4m3Ph03n1x: This should be valid?: false since paid is a negative number. Validations g…

[image] LostKobrakai: That’s not the issue. Validations run at the time the validation function is called. oh, right, I got confused because Phoenix is not showing errors when the action is not set

Note there are times where it is okay to pass in a struct with fields set, namely when you explicitly don’t want to validate them because they come from your own code. Sometimes I’ll throw in something which is set statically (e.g. Post{type: :something}) or a foreign key that way.

Elixir Programming Language Forum

Changeset is not validating data

Questions & Help Questions

dimitarvp April 8, 2025, 6:03pm 7

Yeah. First parameter to cast is data you already trust.