wintermeyer
Is there a way to autoload calculations? Right now I can do Accounts.User.by_id!("123") |> Accounts.load(:gravatar_hash) but I’d like to be able to get the same result with just Accounts.User.by_id!("123")
- Is that possible?
- Is there a reason not to autoload? Other than performance.
The module
defmodule Animina.Accounts.User do
# ...
attributes do
uuid_primary_key :id
attribute :email, :ci_string, allow_nil?: false
attribute :hashed_password, :string, allow_nil?: false, sensitive?: true
end
calculations do
calculate :gravatar_hash, :string, {Animina.Calculations.Md5, field: :email}
end
# ...
identities do
identity :unique_email, [:email]
end
actions do
defaults [:read]
end
code_interface do
define_for Animina.Accounts
define :read
define :by_id, get_by: [:id], action: :read
end
end
``
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zachdaniel
You can use the global preparations block to add a preparation to all read actions, and then you can use the
build/1preparation to add to the query.The only reason not to autoload would be performance
. I generally avoid it, but if its a simple calculation and you access it all the time, its not a big deal at all.
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wintermeyer
For everybody who needs it spoon fed (like me) here’s the code solution: