49 lines
1.3 KiB
Elixir
49 lines
1.3 KiB
Elixir
defmodule Mobilizon.Events.TagRelation do
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@moduledoc """
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Represents a tag relation.
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"""
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use Ecto.Schema
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import Ecto.Changeset
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alias Mobilizon.Events.Tag
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@type t :: %__MODULE__{
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weight: integer,
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tag: Tag.t(),
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link: Tag.t()
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}
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@required_attrs [:tag_id, :link_id]
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@optional_attrs [:weight]
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@attrs @required_attrs ++ @optional_attrs
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@primary_key false
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schema "tag_relations" do
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field(:weight, :integer, default: 1)
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belongs_to(:tag, Tag, primary_key: true)
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belongs_to(:link, Tag, primary_key: true)
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end
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@doc false
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@spec changeset(t | Ecto.Schema.t(), map) :: Ecto.Changeset.t()
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def changeset(%__MODULE__{} = tag, attrs) do
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# Return if tag_id or link_id are not set because it will fail later otherwise
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with %Ecto.Changeset{errors: [], changes: changes} = changeset <-
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tag
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|> cast(attrs, @attrs)
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|> validate_required(@required_attrs) do
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changeset
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|> put_change(:tag_id, min(changes.tag_id, changes.link_id))
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|> put_change(:link_id, max(changes.tag_id, changes.link_id))
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|> unique_constraint(:tag_id, name: :tag_relations_pkey)
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|> check_constraint(:tag_id,
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name: :no_self_loops_check,
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message: "Can't add a relation on self"
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)
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end
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end
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end
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