Split up issue_comment ChangesetBuilder behavior into create and upda…

…te cases

lib/code_corps/github/event/issue_comment/changeset_builder.ex

@@ -18,19 +18,28 @@ defmodule CodeCorps.GitHub.Event.IssueComment.ChangesetBuilder do
   webhook
   """
   @spec build_changeset(Comment.t, map, Task.t, User.t) :: Changeset.t
-  def build_changeset(
-    %Comment{} = comment,
-    %{"comment" => comment_attrs},
-    %Task{id: task_id},
-    %User{id: user_id}) do
+  def build_changeset(%Comment{id: nil} = comment, %{"comment" => attrs}, %Task{} = task, %User{} = user) do
+    comment |> create_changeset(attrs, task, user)
+  end
+  def build_changeset(%Comment{} = comment, %{"comment" => attrs}, %Task{}, %User{}) do
+    comment |> update_changeset(attrs)
+  end
+
+  @spec create_changeset(Comment.t, map, Task.t, User.t) :: Changeset.t
+  defp create_changeset(%Comment{} = comment, %{} = attrs, %Task{} = task, %User{} = user) do
+    comment
+    |> Changeset.change(attrs |> CommentAdapter.from_api())
+    |> MarkdownRendererService.render_markdown_to_html(:markdown, :body)
+    |> Changeset.put_assoc(:task, task)
+    |> Changeset.put_change(:user, user)
+    |> Changeset.validate_required([:markdown, :body])
+  end
 
+  @spec update_changeset(Comment.t, map) :: Changeset.t
+  defp update_changeset(%Comment{} = comment, %{} = attrs) do
     comment
-    |> Changeset.change(comment_attrs |> CommentAdapter.from_api())
+    |> Changeset.change(attrs |> CommentAdapter.from_api())
     |> MarkdownRendererService.render_markdown_to_html(:markdown, :body)
-    |> Changeset.put_change(:task_id, task_id)
-    |> Changeset.put_change(:user_id, user_id)
-    |> Changeset.validate_required([:task_id, :user_id, :markdown, :body])
-    |> Changeset.assoc_constraint(:task)
-    |> Changeset.assoc_constraint(:user)
+    |> Changeset.validate_required([:markdown, :body])
   end
 end

test/lib/code_corps/github/event/issue_comment/changeset_builder_test.exs

@@ -4,15 +4,15 @@ defmodule CodeCorps.GitHub.Event.IssueComment.ChangesetBuilderTest do
   use CodeCorps.DbAccessCase
 
   import CodeCorps.GitHub.TestHelpers
-  import Ecto.Changeset
 
   alias CodeCorps.{
     GitHub.Event.IssueComment.ChangesetBuilder,
     Comment
   }
+  alias Ecto.Changeset
 
   describe "build_changeset/3" do
-    test "assigns proper changes to the task" do
+    test "assigns proper changes to the comment, when it's new" do
       payload = load_event_fixture("issue_comment_created")
       comment = %Comment{}
       task = insert(:task)
@@ -23,16 +23,43 @@ defmodule CodeCorps.GitHub.Event.IssueComment.ChangesetBuilderTest do
       )
 
       # adapted fields
-      assert get_change(changeset, :github_id) == payload["comment"]["id"]
-      assert get_change(changeset, :markdown) == payload["comment"]["body"]
+      assert Changeset.get_change(changeset, :github_id) == payload["comment"]["id"]
+      assert Changeset.get_change(changeset, :markdown) == payload["comment"]["body"]
 
       # html was rendered
-      assert get_change(changeset, :body) ==
+      assert Changeset.get_change(changeset, :body) ==
         Earmark.as_html!(payload["comment"]["body"], %Earmark.Options{code_class_prefix: "language-"})
 
       # relationships are proper
-      assert get_change(changeset, :task_id) == task.id
-      assert get_change(changeset, :user_id) == user.id
+      assert changeset.changes.task.action == :update
+      assert changeset.changes.task.data == task
+      assert changeset.changes.user.action == :update
+      assert changeset.changes.user.data == user
+
+      assert changeset.valid?
+    end
+
+    test "assigns proper changes to the comment, when it existed previously" do
+      payload = load_event_fixture("issue_comment_created")
+      comment = insert(:comment)
+      task = insert(:task)
+      user = insert(:user)
+
+      changeset = ChangesetBuilder.build_changeset(
+        comment, payload, task, user
+      )
+
+      # adapted fields
+      assert Changeset.get_change(changeset, :github_id) == payload["comment"]["id"]
+      assert Changeset.get_change(changeset, :markdown) == payload["comment"]["body"]
+
+      # html was rendered
+      assert Changeset.get_change(changeset, :body) ==
+        Earmark.as_html!(payload["comment"]["body"], %Earmark.Options{code_class_prefix: "language-"})
+
+      # relationships are proper
+      refute changeset |> Changeset.get_change(:task)
+      refute changeset |> Changeset.get_change(:user)
 
       assert changeset.valid?
     end