lots of things done: thread - reply - category - seeds

lib/myapp/data/category.ex

@@ -0,0 +1,24 @@
+defmodule MyApp.Data.Category do
+  use Ecto.Schema
+  import Ecto.Query
+  import Ecto.Changeset
+  alias MyApp.Repo
+  alias MyApp.Data
+
+  @derive {Poison.Encoder, except: [:__meta__]}
+  schema "category" do
+    field :category, :string
+    field :title, :string
+  end
+
+  def changeset(category, params \\ %{}) do
+    category
+    |> cast(params, [:category, :title])
+    |> validate_required([:category, :title])
+  end
+
+  def get_categories() do
+    Repo.all(Data.Category)
+  end
+
+end