work on pipelines

lib/memex/pipelines/pipeline.ex

@@ -1,21 +1,68 @@
 defmodule Memex.Pipelines.Pipeline do
+  @moduledoc """
+  Represents a chain of considerations to take to accomplish a task
+  """
   use Ecto.Schema
   import Ecto.Changeset
+  alias Ecto.{Changeset, UUID}
+  alias Memex.Accounts.User
 
   @primary_key {:id, :binary_id, autogenerate: true}
   @foreign_key_type :binary_id
   schema "pipelines" do
-    field :description, :string
     field :title, :string
+    field :description, :string
+    field :tags, {:array, :string}
+    field :tags_string, :string, virtual: true
     field :visibility, Ecto.Enum, values: [:public, :private, :unlisted]
 
+    belongs_to :user, User
+
     timestamps()
   end
 
+  @type t :: %__MODULE__{
+          title: String.t(),
+          description: String.t(),
+          tags: [String.t()] | nil,
+          tags_string: String.t(),
+          visibility: :public | :private | :unlisted,
+          user: User.t() | Ecto.Association.NotLoaded.t(),
+          user_id: User.id(),
+          inserted_at: NaiveDateTime.t(),
+          updated_at: NaiveDateTime.t()
+        }
+  @type id :: UUID.t()
+  @type changeset :: Changeset.t(t())
+
   @doc false
-  def changeset(pipeline, attrs) do
-    pipeline
-    |> cast(attrs, [:title, :description, :visibility])
-    |> validate_required([:title, :description, :visibility])
+  @spec create_changeset(attrs :: map(), User.t()) :: changeset()
+  def create_changeset(attrs, %User{id: user_id}) do
+    %__MODULE__{}
+    |> cast(attrs, [:title, :description, :tags, :visibility])
+    |> change(user_id: user_id)
+    |> cast_tags_string(attrs)
+    |> validate_required([:title, :user_id, :visibility])
   end
+
+  @spec update_changeset(t(), attrs :: map(), User.t()) :: changeset()
+  def update_changeset(%{user_id: user_id} = pipeline, attrs, %User{id: user_id}) do
+    pipeline
+    |> cast(attrs, [:title, :description, :tags, :visibility])
+    |> cast_tags_string(attrs)
+    |> validate_required([:title, :visibility])
+  end
+
+  defp cast_tags_string(changeset, %{"tags_string" => tags_string})
+       when tags_string |> is_binary() do
+    tags =
+      tags_string
+      |> String.split(",", trim: true)
+      |> Enum.map(fn str -> str |> String.trim() end)
+      |> Enum.sort()
+
+    changeset |> change(tags: tags)
+  end
+
+  defp cast_tags_string(changeset, _attrs), do: changeset
 end