ash_sqlite/test/load_test.exs

defmodule AshSqlite.Test.LoadTest do
  use AshSqlite.RepoCase, async: false
  alias AshSqlite.Test.{Api, Comment, Post}

  require Ash.Query

  test "has_many relationships can be loaded" do
    assert %Post{comments: %Ash.NotLoaded{type: :relationship}} =
             post =
             Post
             |> Ash.Changeset.new(%{title: "title"})
             |> Api.create!()

    Comment
    |> Ash.Changeset.new(%{title: "match"})
    |> Ash.Changeset.manage_relationship(:post, post, type: :append_and_remove)
    |> Api.create!()

    results =
      Post
      |> Ash.Query.load(:comments)
      |> Api.read!()

    assert [%Post{comments: [%{title: "match"}]}] = results
  end

  test "belongs_to relationships can be loaded" do
    assert %Comment{post: %Ash.NotLoaded{type: :relationship}} =
             comment =
             Comment
             |> Ash.Changeset.new(%{})
             |> Api.create!()

    Post
    |> Ash.Changeset.new(%{title: "match"})
    |> Ash.Changeset.manage_relationship(:comments, [comment], type: :append_and_remove)
    |> Api.create!()

    results =
      Comment
      |> Ash.Query.load(:post)
      |> Api.read!()

    assert [%Comment{post: %{title: "match"}}] = results
  end

  test "many_to_many loads work" do
    source_post =
      Post
      |> Ash.Changeset.new(%{title: "source"})
      |> Api.create!()

    destination_post =
      Post
      |> Ash.Changeset.new(%{title: "destination"})
      |> Api.create!()

    destination_post2 =
      Post
      |> Ash.Changeset.new(%{title: "destination"})
      |> Api.create!()

    source_post
    |> Ash.Changeset.new()
    |> Ash.Changeset.manage_relationship(:linked_posts, [destination_post, destination_post2],
      type: :append_and_remove
    )
    |> Api.update!()

    results =
      source_post
      |> Api.load!(:linked_posts)

    assert %{linked_posts: [%{title: "destination"}, %{title: "destination"}]} = results
  end

  test "many_to_many loads work when nested" do
    source_post =
      Post
      |> Ash.Changeset.new(%{title: "source"})
      |> Api.create!()

    destination_post =
      Post
      |> Ash.Changeset.new(%{title: "destination"})
      |> Api.create!()

    source_post
    |> Ash.Changeset.new()
    |> Ash.Changeset.manage_relationship(:linked_posts, [destination_post],
      type: :append_and_remove
    )
    |> Api.update!()

    destination_post
    |> Ash.Changeset.new()
    |> Ash.Changeset.manage_relationship(:linked_posts, [source_post], type: :append_and_remove)
    |> Api.update!()

    results =
      source_post
      |> Api.load!(linked_posts: :linked_posts)

    assert %{linked_posts: [%{title: "destination", linked_posts: [%{title: "source"}]}]} =
             results
  end

  describe "lateral join loads" do
    test "parent references are resolved" do
      post1 =
        Post
        |> Ash.Changeset.new(%{title: "title"})
        |> Api.create!()

      post2 =
        Post
        |> Ash.Changeset.new(%{title: "title"})
        |> Api.create!()

      post2_id = post2.id

      post3 =
        Post
        |> Ash.Changeset.new(%{title: "no match"})
        |> Api.create!()

      assert [%{posts_with_matching_title: [%{id: ^post2_id}]}] =
               Post
               |> Ash.Query.load(:posts_with_matching_title)
               |> Ash.Query.filter(id == ^post1.id)
               |> Api.read!()

      assert [%{posts_with_matching_title: []}] =
               Post
               |> Ash.Query.load(:posts_with_matching_title)
               |> Ash.Query.filter(id == ^post3.id)
               |> Api.read!()
    end

    test "parent references work when joining for filters" do
      %{id: post1_id} =
        Post
        |> Ash.Changeset.new(%{title: "title"})
        |> Api.create!()

      post2 =
        Post
        |> Ash.Changeset.new(%{title: "title"})
        |> Api.create!()

      Post
      |> Ash.Changeset.new(%{title: "no match"})
      |> Api.create!()

      Post
      |> Ash.Changeset.new(%{title: "no match"})
      |> Api.create!()

      assert [%{id: ^post1_id}] =
               Post
               |> Ash.Query.filter(posts_with_matching_title.id == ^post2.id)
               |> Api.read!()
    end

    test "lateral join loads (loads with limits or offsets) are supported" do
      assert %Post{comments: %Ash.NotLoaded{type: :relationship}} =
               post =
               Post
               |> Ash.Changeset.new(%{title: "title"})
               |> Api.create!()

      Comment
      |> Ash.Changeset.new(%{title: "abc"})
      |> Ash.Changeset.manage_relationship(:post, post, type: :append_and_remove)
      |> Api.create!()

      Comment
      |> Ash.Changeset.new(%{title: "def"})
      |> Ash.Changeset.manage_relationship(:post, post, type: :append_and_remove)
      |> Api.create!()

      comments_query =
        Comment
        |> Ash.Query.limit(1)
        |> Ash.Query.sort(:title)

      results =
        Post
        |> Ash.Query.load(comments: comments_query)
        |> Api.read!()

      assert [%Post{comments: [%{title: "abc"}]}] = results

      comments_query =
        Comment
        |> Ash.Query.limit(1)
        |> Ash.Query.sort(title: :desc)

      results =
        Post
        |> Ash.Query.load(comments: comments_query)
        |> Api.read!()

      assert [%Post{comments: [%{title: "def"}]}] = results

      comments_query =
        Comment
        |> Ash.Query.limit(2)
        |> Ash.Query.sort(title: :desc)

      results =
        Post
        |> Ash.Query.load(comments: comments_query)
        |> Api.read!()

      assert [%Post{comments: [%{title: "def"}, %{title: "abc"}]}] = results
    end

    test "loading many to many relationships on records works without loading its join relationship when using code interface" do
      source_post =
        Post
        |> Ash.Changeset.new(%{title: "source"})
        |> Api.create!()

      destination_post =
        Post
        |> Ash.Changeset.new(%{title: "abc"})
        |> Api.create!()

      destination_post2 =
        Post
        |> Ash.Changeset.new(%{title: "def"})
        |> Api.create!()

      source_post
      |> Ash.Changeset.new()
      |> Ash.Changeset.manage_relationship(:linked_posts, [destination_post, destination_post2],
        type: :append_and_remove
      )
      |> Api.update!()

      assert %{linked_posts: [_, _]} = Post.get_by_id!(source_post.id, load: [:linked_posts])
    end
  end
end