Let to specify args like skip, limit and others for views

lib/couchdb_connector/url_helper.ex

@@ -72,9 +72,32 @@ defmodule Couchdb.Connector.UrlHelper do
   @doc """
   Produces the URL to a specific view from a given design document.
   """
-  @spec view_url(Types.db_properties, String.t, String.t) :: String.t
-  def view_url db_props, design, view do
-    "#{design_url(db_props, design)}/_view/#{view}"
+  @spec view_url(Types.db_properties, String.t, String.t, Keyword.t) :: String.t
+  def view_url db_props, design, view, args \\ [] do
+    "#{design_url(db_props, design)}/_view/#{view}#{query(args)}"
+  end
+
+  defp to_bin(i) when is_integer(i), do: Integer.to_string(i)
+  defp to_bin(f) when is_float(f), do: Float.to_string(f)
+  defp to_bin(a) when is_atom(a), do: Atom.to_string(a)
+  defp to_bin(b) when is_binary(b), do: b
+
+  defp prepare({key, value}) do
+    "#{prepare_value(key)}=#{prepare_value(value)}"
+  end
+
+  defp prepare_value(value) do
+    value
+    |> to_bin()
+    |> URI.encode_www_form()
+  end
+
+  defp query([]), do: ""
+  defp query(args) do
+    query = args
+            |> Enum.map(&(prepare(&1)))
+            |> Enum.join("&")
+    "?#{query}"
   end
 
   @doc """

lib/couchdb_connector/view.ex

@@ -22,12 +22,12 @@ defmodule Couchdb.Connector.View do
   @doc """
   Returns everything found for the given view in the given design document.
   """
-  @spec fetch_all(Types.db_properties, String.t, String.t) :: {:ok, String.t} | {:error, String.t}
-  def fetch_all(db_props, design, view) do
+  @spec fetch_all(Types.db_properties, String.t, String.t, Keyword.t) :: {:ok, String.t} | {:error, String.t}
+  def fetch_all(db_props, design, view, args \\ []) do
     db_props
-    |> UrlHelper.view_url(design, view)
-    |> HTTPoison.get!
-    |> Handler.handle_get
+    |> UrlHelper.view_url(design, view, args)
+    |> HTTPoison.get!()
+    |> Handler.handle_get()
   end
 
   @doc """

test/couchdb_connector/url_helper_test.exs

@@ -12,4 +12,14 @@ defmodule Couchdb.Connector.UrlHelperTest do
     assert UrlHelper.query_path(url, key, atom) ==
       "http://localhost/view_name?key=\"%21%2A%27%28%29%3B%3A%40%26%3D%2B%24%2C%2F%3F%23%5B%5D\"&stale=ok"
   end
+
+  test "view_url/3 with args" do
+    dbprops = %{protocol: "http", hostname: "localhost", port: 80, database: "myapp"}
+    design = "users"
+    view = "active_users"
+    args = [limit: 10, skip: 5] # simulate a 5 elements page and page 2
+
+    assert UrlHelper.view_url(dbprops, design, view, args) ==
+      "http://localhost:80/myapp/_design/users/_view/active_users?limit=10&skip=5"
+  end
 end