![]() ![]() The magic here happens on the dump/1 and load/1 functions convert atom to string on the way in and convert string to atom on the way out. CastError) iex:4: value 123 in where cannot be cast to type :string in. The first step is to take the raw input data that we want to apply to the database and generate an Ecto.Changeset struct. Which was failing with the following error: def dump ( _ ), do : :error end By relying on Elixir macros, Ecto knows where user-defined variables are. It also inspired me to try changeset > deletechange(:elementphotos) > putchange(:elementphotos, elementphotos) which also fails. ![]() As the name suggests, cast will perform type. schema/2 is typically used to map data from a persisted source, usually a database table, into Elixir structs and vice-versa. Second, the call to cast converted the birthdate value from the string '1920-0829' to an Elixir Date struct. The definition of the schema is possible through two main APIs: schema/2 and embeddedschema/1. Working on v I ran into an issue trying to save an embedded schema like: defmodule Result do embedded_schema do field :status, CheckStatusEnum field :code, :string field :message, :string field :payload, :map end end then(&(uncastchangeset, :elementphotos, &1)) Oof amazingly that doesn’t work either. An Ecto schema maps external data into Elixir structs. ![]()
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