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Track and record all the changes in your database. Revert back to anytime in history.
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lib/version.ex
defmodule Model.Version do
use Ecto.Schema
import Ecto
import Ecto.Changeset
import Ecto.Query
# how to record column changes in migration
schema "versions" do
field :event, :string
field :item_type, :string
field :item_id, :integer
field :item_changes, :map
field :meta, :map
field :originator, :string
timestamps(updated_at: false)
end
@required_fields ~w(item_type item_id event created_at)
@optional_fields ~w(meta originator)
@doc """
Creates a changeset based on the `model` and `params`.
If no params are provided, an invalid changeset is returned
with no validation performed.
"""
def changeset(model, params \\ :empty) do
model
|> cast(params, @required_fields, @optional_fields)
end
end