Add pagination to events, groups, partipants to an event and categories

lists

lib/mobilizon/ecto.ex

@@ -0,0 +1,34 @@
+defmodule Mobilizon.Ecto do
+  @moduledoc """
+  Mobilizon Ecto utils
+  """
+
+  import Ecto.Query, warn: false
+
+  @doc """
+  Add limit and offset to the query
+  """
+  def paginate(query, page \\ 1, size \\ 10)
+  def paginate(query, page, _size) when is_nil(page), do: paginate(query)
+  def paginate(query, page, size) when is_nil(size), do: paginate(query, page)
+
+  def paginate(query, page, size) do
+    from(query,
+      limit: ^size,
+      offset: ^((page - 1) * size)
+    )
+  end
+
+  def increment_slug(slug) do
+    case List.pop_at(String.split(slug, "-"), -1) do
+      {nil, _} ->
+        slug
+
+      {suffix, slug_parts} ->
+        case Integer.parse(suffix) do
+          {id, _} -> Enum.join(slug_parts, "-") <> "-" <> Integer.to_string(id + 1)
+          :error -> slug <> "-1"
+        end
+    end
+  end
+end