Create module for query building thread schema

lib/diskuy/forum_thread_page.ex

+defmodule Diskuy.ForumThreadPage do
+  @moduledoc """
+  The Query Builder For Paging Thread Schema.
+  """
+
+  import Ecto.Query, warn: false
+  alias Diskuy.Account.User
+  alias Diskuy.Forum.Topic
+  alias Diskuy.Forum.Thread
+
+  def page_recent do
+    query = query_start()
+            |> order_by([tr], desc: tr.inserted_at, asc: tr.title)
+    query
+  end
+
+  def page_top do
+    query_start()
+    |> order_by([tr], desc: tr.points, desc: tr.inserted_at, asc: tr.title)
+  end
+
+  def page_search(title)do
+    query_start()
+    |> where([p], ilike(p.title, ^"%#{String.replace(title, ~r/[%_(\\)]/, "\\\\\\0") }%"))
+  end
+
+  def page_per_topic(topic_id) do
+    query_start()
+    |> where([tr], tr.topic_id == ^topic_id)
+    |> order_by([tr], desc: tr.inserted_at, asc: tr.title)
+  end
+
+  defp query_start do
+    Thread
+    |> join(:inner, [tr], to in Topic, as: :topics, on: tr.topic_id == to.id)
+    |> join(:inner, [tr], u in User, as: :users, on: tr.user_id == u.id)
+    |> select([tr, to, u], %{thread: %{id: tr.id, title: tr.title,
+                             content: tr.content, points: tr.points,
+                             user_id: tr.user_id, topic_id: tr.topic_id, topic_name: to.name,
+                             username: u.username, inserted_at: tr.inserted_at,
+                             updated_at: tr.updated_at}}
+              )
+  end
+end