add steps

lib/memex/steps.ex

@@ -0,0 +1,104 @@
+defmodule Memex.Steps do
+  @moduledoc """
+  The Steps context.
+  """
+
+  import Ecto.Query, warn: false
+  alias Memex.Repo
+
+  alias Memex.Steps.Step
+
+  @doc """
+  Returns the list of steps.
+
+  ## Examples
+
+      iex> list_steps()
+      [%Step{}, ...]
+
+  """
+  def list_steps do
+    Repo.all(Step)
+  end
+
+  @doc """
+  Gets a single step.
+
+  Raises `Ecto.NoResultsError` if the Step does not exist.
+
+  ## Examples
+
+      iex> get_step!(123)
+      %Step{}
+
+      iex> get_step!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_step!(id), do: Repo.get!(Step, id)
+
+  @doc """
+  Creates a step.
+
+  ## Examples
+
+      iex> create_step(%{field: value})
+      {:ok, %Step{}}
+
+      iex> create_step(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_step(attrs \\ %{}) do
+    %Step{}
+    |> Step.changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Updates a step.
+
+  ## Examples
+
+      iex> update_step(step, %{field: new_value})
+      {:ok, %Step{}}
+
+      iex> update_step(step, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_step(%Step{} = step, attrs) do
+    step
+    |> Step.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a step.
+
+  ## Examples
+
+      iex> delete_step(step)
+      {:ok, %Step{}}
+
+      iex> delete_step(step)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_step(%Step{} = step) do
+    Repo.delete(step)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking step changes.
+
+  ## Examples
+
+      iex> change_step(step)
+      %Ecto.Changeset{data: %Step{}}
+
+  """
+  def change_step(%Step{} = step, attrs \\ %{}) do
+    Step.changeset(step, attrs)
+  end
+end

lib/memex/steps/step.ex

@@ -0,0 +1,22 @@
+defmodule Memex.Steps.Step do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @primary_key {:id, :binary_id, autogenerate: true}
+  @foreign_key_type :binary_id
+  schema "steps" do
+    field :description, :string
+    field :position, :integer
+    field :title, :string
+    field :pipeline_id, :binary_id
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(step, attrs) do
+    step
+    |> cast(attrs, [:title, :description, :position])
+    |> validate_required([:title, :description, :position])
+  end
+end

priv/repo/migrations/20220726001809_create_steps.exs

@@ -0,0 +1,17 @@
+defmodule Memex.Repo.Migrations.CreateSteps do
+  use Ecto.Migration
+
+  def change do
+    create table(:steps, primary_key: false) do
+      add :id, :binary_id, primary_key: true
+      add :title, :string
+      add :description, :text
+      add :position, :integer
+      add :pipeline_id, references(:pipelines, on_delete: :nothing, type: :binary_id)
+
+      timestamps()
+    end
+
+    create index(:steps, [:pipeline_id])
+  end
+end

test/memex/steps_test.exs

@@ -0,0 +1,63 @@
+defmodule Memex.StepsTest do
+  use Memex.DataCase
+
+  alias Memex.Steps
+
+  describe "steps" do
+    alias Memex.Steps.Step
+
+    import Memex.StepsFixtures
+
+    @invalid_attrs %{description: nil, position: nil, title: nil}
+
+    test "list_steps/0 returns all steps" do
+      step = step_fixture()
+      assert Steps.list_steps() == [step]
+    end
+
+    test "get_step!/1 returns the step with given id" do
+      step = step_fixture()
+      assert Steps.get_step!(step.id) == step
+    end
+
+    test "create_step/1 with valid data creates a step" do
+      valid_attrs = %{description: "some description", position: 42, title: "some title"}
+
+      assert {:ok, %Step{} = step} = Steps.create_step(valid_attrs)
+      assert step.description == "some description"
+      assert step.position == 42
+      assert step.title == "some title"
+    end
+
+    test "create_step/1 with invalid data returns error changeset" do
+      assert {:error, %Ecto.Changeset{}} = Steps.create_step(@invalid_attrs)
+    end
+
+    test "update_step/2 with valid data updates the step" do
+      step = step_fixture()
+      update_attrs = %{description: "some updated description", position: 43, title: "some updated title"}
+
+      assert {:ok, %Step{} = step} = Steps.update_step(step, update_attrs)
+      assert step.description == "some updated description"
+      assert step.position == 43
+      assert step.title == "some updated title"
+    end
+
+    test "update_step/2 with invalid data returns error changeset" do
+      step = step_fixture()
+      assert {:error, %Ecto.Changeset{}} = Steps.update_step(step, @invalid_attrs)
+      assert step == Steps.get_step!(step.id)
+    end
+
+    test "delete_step/1 deletes the step" do
+      step = step_fixture()
+      assert {:ok, %Step{}} = Steps.delete_step(step)
+      assert_raise Ecto.NoResultsError, fn -> Steps.get_step!(step.id) end
+    end
+
+    test "change_step/1 returns a step changeset" do
+      step = step_fixture()
+      assert %Ecto.Changeset{} = Steps.change_step(step)
+    end
+  end
+end

test/support/fixtures/steps_fixtures.ex

@@ -0,0 +1,22 @@
+defmodule Memex.StepsFixtures do
+  @moduledoc """
+  This module defines test helpers for creating
+  entities via the `Memex.Steps` context.
+  """
+
+  @doc """
+  Generate a step.
+  """
+  def step_fixture(attrs \\ %{}) do
+    {:ok, step} =
+      attrs
+      |> Enum.into(%{
+        description: "some description",
+        position: 42,
+        title: "some title"
+      })
+      |> Memex.Steps.create_step()
+
+    step
+  end
+end