Flop Phoenix

Flop Phoenix is an Elixir library for filtering, ordering and pagination with Ecto, Phoenix and Flop.

Installation

Add flop_phoenix to your list of dependencies in the mix.exs of your Phoenix application.

def deps do
  [
    {:flop_phoenix, "~> 0.13.0"}
  ]
end

Follow the instructions in the Flop documentation to set up your business logic.

Fetch the data

Define a function that calls Flop.validate_and_run/3 to query the list of pets.

defmodule MyApp.Pets do
  alias MyApp.Pet

  def list_pets(params) do
    Flop.validate_and_run(Pet, params, for: Pet)
  end
end

In your controller, pass the data and the Flop meta struct to your template.

defmodule MyAppWeb.PetController do
  use MyAppWeb, :controller

  alias MyApp.Pets

  action_fallback MyAppWeb.FallbackController

  def index(conn, params) do
    with {:ok, {pets, meta}} <- Pets.list_pets(params) do
      render(conn, "index.html", meta: meta, pets: pets)
    end
  end
end

You can fetch the data similarly in the handle_params/3 function of a LiveView or the update/2 function of a LiveComponent.

defmodule MyAppWeb.PetLive.Index do
  use MyAppWeb, :live_view

  alias MyApp.Pets

  @impl Phoenix.LiveView
  def handle_params(params, _, socket) do
    with {:ok, {pets, meta}} <- Pets.list_pets(params) do
      {:noreply, assign(socket, %{pets: pets, meta: meta})}
    end
  end
end

Sortable table and pagination components

In your template, add a sortable table and pagination links.

<h1>Pets</h1>

<Flop.Phoenix.table
  items={@pets}
  meta={@meta}
  path_helper={{Routes, :pet_path, [@socket, :index]}}
>
  <:col let={pet} label="Name" field={:name}><%= pet.name %></:col>
  <:col let={pet} label="Age" field={:age}><%= pet.age %></:col>
</Flop.Phoenix.table>

<Flop.Phoenix.pagination
  meta={@meta}
  path_helper={{Routes, :pet_path, [@socket, :index]}}
/>

path_helper should reference the path helper function that builds a path to the current page. Add any additional path and query parameters to the argument list.

<Flop.Phoenix.pagination
  meta={@meta}
  path_helper={{Routes, :pet_path, [@conn, :index, @owner, [hide_menu: true]]}}
/>

If you pass the for option when making the query with Flop, Flop Phoenix can determine which table columns are sortable. It also hides the order and page_size parameters if they match the default values defined with Flop.Schema.

See Flop.Phoenix.cursor_pagination/1 for instructions to set up cursor-based pagination.

Filter forms

This library implements Phoenix.HTML.FormData for the Flop.Meta struct, which means you can pass the struct to the Phoenix form functions. The easiest way to render a filter form is to use the Flop.Phoenix.filter_fields/1 component:

<.form let={f} for={@meta}>
  <Flop.Phoenix.filter_fields let={entry} form={f} fields={[:name, :email]}>
    <%= entry.label %>
    <%= entry.input %>
  </Flop.Phoenix.filter_fields>
</.form>

Refer to the Flop.Phoenix module documentation for more examples.