148 lines
3.0 KiB
Elixir
148 lines
3.0 KiB
Elixir
defmodule GenericRestServer.Items do
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@moduledoc """
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The Items context.
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"""
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import Ecto.Query, warn: false
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alias GenericRestServer.Repo
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alias GenericRestServer.Items.Item
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alias GenericRestServer.Accounts.Scope
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@doc """
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Subscribes to scoped notifications about any item changes.
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The broadcasted messages match the pattern:
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* {:created, %Item{}}
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* {:updated, %Item{}}
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* {:deleted, %Item{}}
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"""
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def subscribe_items(%Scope{} = scope) do
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key = scope.user.id
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Phoenix.PubSub.subscribe(GenericRestServer.PubSub, "user:#{key}:items")
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end
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defp broadcast_item(%Scope{} = scope, message) do
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key = scope.user.id
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Phoenix.PubSub.broadcast(GenericRestServer.PubSub, "user:#{key}:items", message)
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end
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@doc """
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Returns the list of items.
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## Examples
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iex> list_items(scope)
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[%Item{}, ...]
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"""
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def list_items(%Scope{} = scope) do
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Repo.all_by(Item, user_id: scope.user.id)
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end
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@doc """
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Gets a single item.
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Raises `Ecto.NoResultsError` if the Item does not exist.
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## Examples
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iex> get_item!(scope, 123)
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%Item{}
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iex> get_item!(scope, 456)
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** (Ecto.NoResultsError)
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"""
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def get_item!(%Scope{} = scope, id) do
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Repo.get_by!(Item, id: id, user_id: scope.user.id)
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end
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@doc """
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Creates a item.
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## Examples
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iex> create_item(scope, %{field: value})
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{:ok, %Item{}}
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iex> create_item(scope, %{field: bad_value})
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{:error, %Ecto.Changeset{}}
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"""
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def create_item(%Scope{} = scope, attrs) do
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with {:ok, item = %Item{}} <-
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%Item{}
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|> Item.changeset(attrs, scope)
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|> Repo.insert() do
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broadcast_item(scope, {:created, item})
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{:ok, item}
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end
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end
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@doc """
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Updates a item.
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## Examples
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iex> update_item(scope, item, %{field: new_value})
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{:ok, %Item{}}
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iex> update_item(scope, item, %{field: bad_value})
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{:error, %Ecto.Changeset{}}
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"""
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def update_item(%Scope{} = scope, %Item{} = item, attrs) do
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true = item.user_id == scope.user.id
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with {:ok, item = %Item{}} <-
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item
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|> Item.changeset(attrs, scope)
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|> Repo.update() do
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broadcast_item(scope, {:updated, item})
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{:ok, item}
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end
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end
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@doc """
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Deletes a item.
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## Examples
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iex> delete_item(scope, item)
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{:ok, %Item{}}
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iex> delete_item(scope, item)
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{:error, %Ecto.Changeset{}}
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"""
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def delete_item(%Scope{} = scope, %Item{} = item) do
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true = item.user_id == scope.user.id
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with {:ok, item = %Item{}} <-
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Repo.delete(item) do
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broadcast_item(scope, {:deleted, item})
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{:ok, item}
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end
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end
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@doc """
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Returns an `%Ecto.Changeset{}` for tracking item changes.
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## Examples
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iex> change_item(scope, item)
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%Ecto.Changeset{data: %Item{}}
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"""
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def change_item(%Scope{} = scope, %Item{} = item, attrs \\ %{}) do
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true = item.user_id == scope.user.id
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Item.changeset(item, attrs, scope)
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end
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end
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