I want to have resource examples of all Ash calculations
Here's the cond example:
calculations do
calculate(:title, :string, expr(
cond do
type == "RCCB" -> current <> "A P" <> slots <> " " <> type
type == "MCB" -> curve <> current <> " P" <> slots <> " " <> type
end
))
end
Here's an example resource with full code:
defmodule NoSpark.Builder.Module do
use Ash.Resource,
data_layer: AshSqlite.DataLayer
sqlite do
table "modules"
repo NoSpark.Repo
end
attributes do
uuid_primary_key :id
attribute :current, :integer do
allow_nil? false
constraints min: 0
end
attribute :curve, :string do
allow_nil? false
end
attribute :type, :string do
allow_nil? false
end
end
calculations do
calculate(:title, :string, expr(
cond do
type == "RCCB" -> current <> "A " <> type
type == "MCB" -> curve <> current <> " " <> type
end
))
end
code_interface do
define_for(NoSpark.Builder)
define(:read)
end
actions do
defaults [:create, :read, :update, :destroy]
end
end
Here's how you would load the calculation:
Builder.Module
|> Ash.Query.load([:title])
|> Builder.read!()
# or with the code interface
Builder.Module.read!(load: [:title])
Hope this helps.
Top comments (0)