Ecto - select all fields from all tables in a 5 table join - ecto

Question

I have a products table, a categories table, and a shops table, as well as joining tables product_shops, and product_categories.
I want to select all products that have a category which is in the conn.query_params, that are in shops that are within a certain distance which is specified in the conn.query_params. And I want to return pretty much every field of the product, category, and shop that was selected.
I have this:
get "/products" do
query = conn.query_params
point = %Geo.Point{coordinates: {String.to_float(query["longitude"]), String.to_float(query["latitude"])}, srid: 4326}
shops = within(Shop, point, String.to_float(query["distanceFromPlaceValue"]) * 1000) |> order_by_nearest(point) |> select_with_distance(point) |> Api.Repo.all
categories = Enum.map(query["categories"], fn(x) -> String.to_integer(x) end)
shop_ids = Enum.map(shops, fn(x) -> x.id end)
query1 = from p in Product,
join: ps in ProductShop, on: p.id == ps.p_id,
join: s in Shop, on: s.id == ps.s_id,
join: pc in ProductCategory, on: p.id == pc.p_id,
join: c in Category, on: c.id == pc.c_id,
where: Enum.member?(categories, c.id),
where: Enum.member?(shop_ids, s.id),
select: p, c, s,
group_by s,
order_by s.distance
In the code above, the shops variable holds all the shops that are within the specified distance.
this is inside shop.ex to get all shops within distance, ordered from the closest shop:
def within(query, point, radius_in_m) do
{lng, lat} = point.coordinates
from(shop in query, where: fragment("ST_DWithin(?::geography, ST_SetSRID(ST_MakePoint(?, ?), ?), ?)", shop.point, ^lng, ^lat, ^point.srid, ^radius_in_m))
end
def order_by_nearest(query, point) do
{lng, lat} = point.coordinates
from(shop in query, order_by: fragment("? <-> ST_SetSRID(ST_MakePoint(?,?), ?)", shop.point, ^lng, ^lat, ^point.srid))
end
def select_with_distance(query, point) do
{lng, lat} = point.coordinates
from(shop in query, select: %{shop | distance: fragment("ST_Distance_Sphere(?, ST_SetSRID(ST_MakePoint(?,?), ?))", shop.point, ^lng, ^lat, ^point.srid)})
end
This is the shop schema and the distance field gets populated when the select_with_distance variable is called.
#derive {Poison.Encoder, only: [:name, :place_id, :point]}
schema "shops" do
field :name, :string
field :place_id, :string
field :point, Geo.Point
field :distance, :float, virtual: true
timestamps()
end
My current error is in the select: p, c, s line as I'm unsure how to select the whole lot:
== Compilation error on file lib/api/router.ex ==
** (SyntaxError) lib/api/router.ex:153: syntax error before: c
(elixir) lib/kernel/parallel_compiler.ex:117: anonymous fn/4 in Kernel.ParallelCompiler.spawn_compilers/1
Also unsure if the group_by should be the shop. I just know I want to return all fields and only unique fields, ordered by proximity of the shop. I feel most of the way there but a bit stuck on the select, group_by, and order_by.
EDIT: Thanks Dogbert for fixing those two issues in the comments.
currently code is:
products_shops_categories = from p in Product,
join: ps in ProductShop, on: p.id == ps.p_id,
join: s in Shop, on: s.id == ps.s_id,
join: pc in ProductCategory, on: p.id == pc.p_id,
join: c in Category, on: c.id == pc.c_id,
where: c.id in ^categories,
where: s.id in ^shop_ids,
select: {p, c, s}
group_by s,
order_by s.distance
I have this error now:
** (Ecto.Query.CompileError) `order_by(s.distance())` is not a valid query expression.
* If you intended to call a database function, please check the documentation
for Ecto.Query to see the supported database expressions
* If you intended to call an Elixir function or introduce a value,
you need to explicitly interpolate it with ^
expanding macro: Ecto.Query.group_by/2
lib/api/router.ex:155: Api.Router.do_match/4
(elixir) lib/kernel/parallel_compiler.ex:117: anonymous fn/4 in Kernel.ParallelCompiler.spawn_compilers/1