From 479783cb7dd70a6680a13fc6abdefadc22757f9d Mon Sep 17 00:00:00 2001
From: "Liam P. White" <byteslice@airmail.cc>
Date: Wed, 28 Aug 2019 13:21:17 -0400
Subject: [PATCH] context: messages

---
 lib/philomena/conversations.ex         | 96 ++++++++++++++++++++++++++
 lib/philomena/conversations/message.ex | 20 ++++++
 test/philomena/conversations_test.exs  | 57 +++++++++++++++
 3 files changed, 173 insertions(+)
 create mode 100644 lib/philomena/conversations/message.ex

diff --git a/lib/philomena/conversations.ex b/lib/philomena/conversations.ex
index 51ce0dc8..8bca0edb 100644
--- a/lib/philomena/conversations.ex
+++ b/lib/philomena/conversations.ex
@@ -101,4 +101,100 @@ defmodule Philomena.Conversations do
   def change_conversation(%Conversation{} = conversation) do
     Conversation.changeset(conversation, %{})
   end
+
+  alias Philomena.Conversations.Message
+
+  @doc """
+  Returns the list of messages.
+
+  ## Examples
+
+      iex> list_messages()
+      [%Message{}, ...]
+
+  """
+  def list_messages do
+    Repo.all(Message)
+  end
+
+  @doc """
+  Gets a single message.
+
+  Raises `Ecto.NoResultsError` if the Message does not exist.
+
+  ## Examples
+
+      iex> get_message!(123)
+      %Message{}
+
+      iex> get_message!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_message!(id), do: Repo.get!(Message, id)
+
+  @doc """
+  Creates a message.
+
+  ## Examples
+
+      iex> create_message(%{field: value})
+      {:ok, %Message{}}
+
+      iex> create_message(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_message(attrs \\ %{}) do
+    %Message{}
+    |> Message.changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Updates a message.
+
+  ## Examples
+
+      iex> update_message(message, %{field: new_value})
+      {:ok, %Message{}}
+
+      iex> update_message(message, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_message(%Message{} = message, attrs) do
+    message
+    |> Message.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a Message.
+
+  ## Examples
+
+      iex> delete_message(message)
+      {:ok, %Message{}}
+
+      iex> delete_message(message)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_message(%Message{} = message) do
+    Repo.delete(message)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking message changes.
+
+  ## Examples
+
+      iex> change_message(message)
+      %Ecto.Changeset{source: %Message{}}
+
+  """
+  def change_message(%Message{} = message) do
+    Message.changeset(message, %{})
+  end
 end
diff --git a/lib/philomena/conversations/message.ex b/lib/philomena/conversations/message.ex
new file mode 100644
index 00000000..c0846eeb
--- /dev/null
+++ b/lib/philomena/conversations/message.ex
@@ -0,0 +1,20 @@
+defmodule Philomena.Conversations.Message do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  schema "messages" do
+    belongs_to :conversation, Philomena.Conversations.Conversation
+    belongs_to :from, Philomena.Users.User
+
+    field :body, :string
+    
+    timestamps(inserted_at: :created_at)
+  end
+
+  @doc false
+  def changeset(message, attrs) do
+    message
+    |> cast(attrs, [])
+    |> validate_required([])
+  end
+end
diff --git a/test/philomena/conversations_test.exs b/test/philomena/conversations_test.exs
index 94357e2a..54fb1562 100644
--- a/test/philomena/conversations_test.exs
+++ b/test/philomena/conversations_test.exs
@@ -59,4 +59,61 @@ defmodule Philomena.ConversationsTest do
       assert %Ecto.Changeset{} = Conversations.change_conversation(conversation)
     end
   end
+
+  describe "messages" do
+    alias Philomena.Conversations.Message
+
+    @valid_attrs %{}
+    @update_attrs %{}
+    @invalid_attrs %{}
+
+    def message_fixture(attrs \\ %{}) do
+      {:ok, message} =
+        attrs
+        |> Enum.into(@valid_attrs)
+        |> Conversations.create_message()
+
+      message
+    end
+
+    test "list_messages/0 returns all messages" do
+      message = message_fixture()
+      assert Conversations.list_messages() == [message]
+    end
+
+    test "get_message!/1 returns the message with given id" do
+      message = message_fixture()
+      assert Conversations.get_message!(message.id) == message
+    end
+
+    test "create_message/1 with valid data creates a message" do
+      assert {:ok, %Message{} = message} = Conversations.create_message(@valid_attrs)
+    end
+
+    test "create_message/1 with invalid data returns error changeset" do
+      assert {:error, %Ecto.Changeset{}} = Conversations.create_message(@invalid_attrs)
+    end
+
+    test "update_message/2 with valid data updates the message" do
+      message = message_fixture()
+      assert {:ok, %Message{} = message} = Conversations.update_message(message, @update_attrs)
+    end
+
+    test "update_message/2 with invalid data returns error changeset" do
+      message = message_fixture()
+      assert {:error, %Ecto.Changeset{}} = Conversations.update_message(message, @invalid_attrs)
+      assert message == Conversations.get_message!(message.id)
+    end
+
+    test "delete_message/1 deletes the message" do
+      message = message_fixture()
+      assert {:ok, %Message{}} = Conversations.delete_message(message)
+      assert_raise Ecto.NoResultsError, fn -> Conversations.get_message!(message.id) end
+    end
+
+    test "change_message/1 returns a message changeset" do
+      message = message_fixture()
+      assert %Ecto.Changeset{} = Conversations.change_message(message)
+    end
+  end
 end