Composite Primary Keys using Elixir Ecto. def changeset(record, attrs) do record > cast(attrs, :number. If you want to cast changes on a structs associations, you can use the changeset function castassoc/3. If you're getting the old structs from Ecto queries, you probably have the old types defined for them in your schemas, which you should change from field :foo, Ecto.DateTime to field :foo, NaiveDateTime (or field :foo, DateTime). Ecto is a toolkit for data mapping and language integrated query for Elixir. For everyone complaining about orm-something - take a look at elixirs Ecto. 1 Photo by Brooke Lark on Unsplash In our previous post we took a little look at the differences between some common changeset functions in Ecto. In our example we are going to use /3 since users will only ever have one profile associated with them. If you still want to explicitly convert between them, you can do |> _erl |> om_erl! and use that value in your query: iex(1)> dt = Your choice here affects the behavior of embed-specific functions like /4 and /3, so choose whichever is most appropriate to your use case. After the castattachments/3 call, you get back a changeset that might be modified directly. You can pass the -database option to change or -no-ecto flag to exclude this. The recommended way in Ecto 2.1 is to stop using deprecated Ecto.DateTime struct and use Elixir's new NaiveDateTime (or DateTime) everywhere. PostgreSQL (via postgrex) MySQL (via myxql) MSSQL (via tds) ETS (via etso) SQLite3 (via ectosqlite3) Newly generated Phoenix projects include Ecto with the PostgreSQL adapter by default. Ecto provides primitive types that handle most cases, however, you’ll occasionally work with data that doesn’t fit with the existing types. It looks like Ecto does not support casting from the deprecated Ecto.DateTime to the new Elixir NaiveDateTime struct, which you're using when you use :naive_datetime in Ecto 2.1+: iex(1)> dt = Alchemist's Edition 161: Custom Ecto Type.
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