Ecto Changesets

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Ecto.Repo.insert/2, update/2 and delete/2 require a changeset as their first parameter. The creating, updating or deleting of table data always requires a changeset.

Changesets can be created using the data from a table schema.

Using Ecto.Changeset.cast

Ecto.Changeset.cast(%Friends.Person{name: "Bob"}, %{"name" => "Jack"}, [:name, :age])

The previous code takes three arguments.

• The Schema
• the change you want to make to the data
• The names of the fields that you are allowed to change (as a list of atoms)