Add Ideas context and Idea module

lib/idea_inbox/ideas/idea.ex

@@ -0,0 +1,20 @@
+defmodule IdeaInbox.Ideas.Idea do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+
+  schema "ideas" do
+    field :title, :string
+    field :up_votes, :integer, default: 0
+    field :down_votes, :integer, default: 0
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(idea, attrs) do
+    idea
+    |> cast(attrs, [:title])
+    |> validate_required([:title])
+  end
+end

lib/idea_inbox/ideas/ideas.ex

@@ -0,0 +1,104 @@
+defmodule IdeaInbox.Ideas do
+  @moduledoc """
+  The Ideas context.
+  """
+
+  import Ecto.Query, warn: false
+  alias IdeaInbox.Repo
+
+  alias IdeaInbox.Ideas.Idea
+
+  @doc """
+  Returns the list of ideas.
+
+  ## Examples
+
+      iex> list_ideas()
+      [%Idea{}, ...]
+
+  """
+  def list_ideas do
+    Repo.all(Idea)
+  end
+
+  @doc """
+  Gets a single idea.
+
+  Raises `Ecto.NoResultsError` if the Idea does not exist.
+
+  ## Examples
+
+      iex> get_idea!(123)
+      %Idea{}
+
+      iex> get_idea!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_idea!(id), do: Repo.get!(Idea, id)
+
+  @doc """
+  Creates a idea.
+
+  ## Examples
+
+      iex> create_idea(%{field: value})
+      {:ok, %Idea{}}
+
+      iex> create_idea(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_idea(attrs \\ %{}) do
+    %Idea{}
+    |> Idea.changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Updates a idea.
+
+  ## Examples
+
+      iex> update_idea(idea, %{field: new_value})
+      {:ok, %Idea{}}
+
+      iex> update_idea(idea, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_idea(%Idea{} = idea, attrs) do
+    idea
+    |> Idea.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a Idea.
+
+  ## Examples
+
+      iex> delete_idea(idea)
+      {:ok, %Idea{}}
+
+      iex> delete_idea(idea)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_idea(%Idea{} = idea) do
+    Repo.delete(idea)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking idea changes.
+
+  ## Examples
+
+      iex> change_idea(idea)
+      %Ecto.Changeset{source: %Idea{}}
+
+  """
+  def change_idea(%Idea{} = idea) do
+    Idea.changeset(idea, %{})
+  end
+end

priv/repo/migrations/20181007014738_create_ideas.exs

@@ -0,0 +1,14 @@
+defmodule IdeaInbox.Repo.Migrations.CreateIdeas do
+  use Ecto.Migration
+
+  def change do
+    create table(:ideas) do
+      add :title, :string
+      add :up_votes, :integer
+      add :down_votes, :integer
+
+      timestamps()
+    end
+
+  end
+end

test/idea_inbox/ideas/ideas_test.exs

@@ -0,0 +1,71 @@
+defmodule IdeaInbox.IdeasTest do
+  use IdeaInbox.DataCase
+
+  alias IdeaInbox.Ideas
+
+  describe "ideas" do
+    alias IdeaInbox.Ideas.Idea
+
+    @valid_attrs %{down_votes: 42, timestamps: "some timestamps", title: "some title", up_votes: 42}
+    @update_attrs %{down_votes: 43, timestamps: "some updated timestamps", title: "some updated title", up_votes: 43}
+    @invalid_attrs %{down_votes: nil, timestamps: nil, title: nil, up_votes: nil}
+
+    def idea_fixture(attrs \\ %{}) do
+      {:ok, idea} =
+        attrs
+        |> Enum.into(@valid_attrs)
+        |> Ideas.create_idea()
+
+      idea
+    end
+
+    test "list_ideas/0 returns all ideas" do
+      idea = idea_fixture()
+      assert Ideas.list_ideas() == [idea]
+    end
+
+    test "get_idea!/1 returns the idea with given id" do
+      idea = idea_fixture()
+      assert Ideas.get_idea!(idea.id) == idea
+    end
+
+    test "create_idea/1 with valid data creates a idea" do
+      assert {:ok, %Idea{} = idea} = Ideas.create_idea(@valid_attrs)
+      assert idea.down_votes == 42
+      assert idea.timestamps == "some timestamps"
+      assert idea.title == "some title"
+      assert idea.up_votes == 42
+    end
+
+    test "create_idea/1 with invalid data returns error changeset" do
+      assert {:error, %Ecto.Changeset{}} = Ideas.create_idea(@invalid_attrs)
+    end
+
+    test "update_idea/2 with valid data updates the idea" do
+      idea = idea_fixture()
+      assert {:ok, idea} = Ideas.update_idea(idea, @update_attrs)
+      assert %Idea{} = idea
+      assert idea.down_votes == 43
+      assert idea.timestamps == "some updated timestamps"
+      assert idea.title == "some updated title"
+      assert idea.up_votes == 43
+    end
+
+    test "update_idea/2 with invalid data returns error changeset" do
+      idea = idea_fixture()
+      assert {:error, %Ecto.Changeset{}} = Ideas.update_idea(idea, @invalid_attrs)
+      assert idea == Ideas.get_idea!(idea.id)
+    end
+
+    test "delete_idea/1 deletes the idea" do
+      idea = idea_fixture()
+      assert {:ok, %Idea{}} = Ideas.delete_idea(idea)
+      assert_raise Ecto.NoResultsError, fn -> Ideas.get_idea!(idea.id) end
+    end
+
+    test "change_idea/1 returns a idea changeset" do
+      idea = idea_fixture()
+      assert %Ecto.Changeset{} = Ideas.change_idea(idea)
+    end
+  end
+end