Feat: implement remove_item_from_list/3 function

[nelsonic]

As outlined in #420 we already have a simple way to add an item to a list:

mvp/lib/app/list.ex

Lines 149 to 154 in b8aee0e

	def add_item_to_list(item_cid, list_cid, person_id) do
	list = get_list_by_cid!(list_cid)
	prev_seq = get_list_seq(list)
	seq = [item_cid | prev_seq] |> Enum.join(",")
	update_list(list, %{seq: seq, person_id: person_id})
	end

need a way of removing an item from the list so that we can easily move the item to a different list.

Todo

• Write tests for remove_item_from_list/3 🧪
• Implement remove_item_from_list/3 function to pass tests 🧑‍💻
• Document it with examples in /book 📘
• Ship.

[nelsonic]

Quick side-quest: dwyl/useful#55

[nelsonic]

https://hexdocs.pm/useful/1.13.1/Useful.html#remove_item_from_list/2 📦

[nelsonic]

Easy:

mvp/lib/app/list.ex

Lines 188 to 198 in f212cd5

	def remove_item_from_list(item_cid, list_cid, person_id) do
	list = get_list_by_cid!(list_cid)
	# get existing list.seq
	seq =
	get_list_seq(list)
	# remove the item_cid from the list.seq:
	|> Useful.remove_item_from_list(item_cid)
	|> Enum.join(",")
	update_list(list, %{seq: seq, person_id: person_id})
	end

Documented in: mvp/19-add-item-to-list.md#remove-item-from-list

Published at: https://dwyl.github.io/book/mvp/19-add-item-to-list.html

[nelsonic]

Included in #165