mobilizon.chapril.org-mobil.../lib/mobilizon/addresses/addresses.ex

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Elixir
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defmodule Mobilizon.Addresses do
@moduledoc """
The Addresses context.
"""
import Ecto.Query, warn: false
alias Mobilizon.Repo
require Logger
alias Mobilizon.Addresses.Address
@geom_types [:point]
@doc false
def data() do
Dataloader.Ecto.new(Repo, query: &query/2)
end
@doc false
def query(queryable, _params) do
queryable
end
@doc """
Returns the list of addresses.
## Examples
iex> list_addresses()
[%Address{}, ...]
"""
def list_addresses do
Repo.all(Address)
end
@doc """
Gets a single address.
Raises `Ecto.NoResultsError` if the Address does not exist.
## Examples
iex> get_address!(123)
%Address{}
iex> get_address!(456)
** (Ecto.NoResultsError)
"""
def get_address!(id), do: Repo.get!(Address, id)
@doc """
Creates a address.
## Examples
iex> create_address(%{field: value})
{:ok, %Address{}}
iex> create_address(%{field: bad_value})
{:error, %Ecto.Changeset{}}
"""
def create_address(attrs \\ %{}) do
%Address{}
|> Address.changeset(attrs)
|> Repo.insert()
end
@doc """
Updates a address.
## Examples
iex> update_address(address, %{field: new_value})
{:ok, %Address{}}
iex> update_address(address, %{field: bad_value})
{:error, %Ecto.Changeset{}}
"""
def update_address(%Address{} = address, attrs) do
address
|> Address.changeset(attrs)
|> Repo.update()
end
@doc """
Deletes a Address.
## Examples
iex> delete_address(address)
{:ok, %Address{}}
iex> delete_address(address)
{:error, %Ecto.Changeset{}}
"""
def delete_address(%Address{} = address) do
Repo.delete(address)
end
@doc """
Returns an `%Ecto.Changeset{}` for tracking address changes.
## Examples
iex> change_address(address)
%Ecto.Changeset{source: %Address{}}
"""
def change_address(%Address{} = address) do
Address.changeset(address, %{})
end
@doc """
Processes raw geo data informations and return a `Geo` geometry which can be one of `Geo.Point`.
"""
# TODO: Unused, remove me
def process_geom(%{"type" => type_input, "data" => data}) do
type =
if !is_atom(type_input) && type_input != nil do
try do
String.to_existing_atom(type_input)
rescue
e in ArgumentError ->
Logger.error("#{type_input} is not an existing atom : #{inspect(e)}")
:invalid_type
end
else
type_input
end
if Enum.member?(@geom_types, type) do
case type do
:point ->
process_point(data["latitude"], data["longitude"])
end
else
{:error, :invalid_type}
end
end
@doc false
def process_geom(nil) do
{:error, nil}
end
@spec process_point(number(), number()) :: tuple()
defp process_point(latitude, longitude) when is_number(latitude) and is_number(longitude) do
{:ok, %Geo.Point{coordinates: {latitude, longitude}, srid: 4326}}
end
defp process_point(_, _) do
{:error, "Latitude and longitude must be numbers"}
end
@doc """
Search addresses in our database
We only look at the description for now, and eventually order by object distance
"""
@spec search_addresses(String.t(), list()) :: list(Address.t())
def search_addresses(search, options) do
limit = Keyword.get(options, :limit, 5)
query = from(a in Address, where: ilike(a.description, ^"%#{search}%"), limit: ^limit)
query =
if coords = Keyword.get(options, :coords, false),
do:
from(a in query,
order_by: [fragment("? <-> ?", a.geom, ^"POINT(#{coords.lon} #{coords.lat})'")]
),
else: query
query =
if country = Keyword.get(options, :country, nil),
do: from(a in query, where: ilike(a.country, ^"%#{country}%")),
else: query
Repo.all(query)
end
@doc """
Reverse geocode from coordinates in our database
We only take addresses 50km around and sort them by distance
"""
@spec reverse_geocode(number(), number(), list()) :: list(Address.t())
def reverse_geocode(lon, lat, options) do
limit = Keyword.get(options, :limit, 5)
radius = Keyword.get(options, :radius, 50_000)
country = Keyword.get(options, :country, nil)
srid = Keyword.get(options, :srid, 4326)
import Geo.PostGIS
with {:ok, point} <- Geo.WKT.decode("SRID=#{srid};POINT(#{lon} #{lat})") do
query =
from(a in Address,
order_by: [fragment("? <-> ?", a.geom, ^point)],
limit: ^limit,
where: st_dwithin_in_meters(^point, a.geom, ^radius)
)
query =
if country,
do: from(a in query, where: ilike(a.country, ^"%#{country}%")),
else: query
Repo.all(query)
end
end
end