Ash Framework: Chapter 1

Pragmatic Bookshelf PragProg Customers
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1

I’m trying to reset the database and reseed… at some point shortly after the “Defining A Read Action” where you add the “primary? true”, I get the following error when trying to reseed with “mix seed”:

** (Ash.Error.Invalid)
Invalid Error

* Tunez.Music.Artist.read had no matching bulk strategy that could be used.

Requested strategies: [:stream]

Could not use `:stream`: could not stream the query
Could not use `:atomic_batches`: Not in requested strategies
Could not use `:atomic`: Not in requested strategies



Non stream reason:

Action Tunez.Music.Artist.read does not support streaming with one of [:keyset].

There are two ways to handle this.

1.) Use the `allow_stream_with` or `stream_with` options to control what strategies are allowed.
2.) Enable the respective required pagination type on the action read, for example:

    # allow keyset
    pagination keyset?: true, required?: false

    # allow offset
    pagination offset?: true, required?: false

    # allow both
    pagination offset?: true, keyset?: true, required?: false



  (ash 3.5.24) lib/ash/error/invalid/no_matching_bulk_strategy.ex:4: Ash.Error.Invalid.NoMatchingBulkStrategy.exception/1
  (ash 3.5.24) lib/ash/actions/destroy/bulk.ex:184: Ash.Actions.Destroy.Bulk.run/6
  (ash 3.5.24) lib/ash.ex:3421: Ash.bulk_destroy!/4
  priv/repo/seeds/01-artists.exs:16: (file)
  (elixir 1.18.4) src/elixir_compiler.erl:77: :elixir_compiler.dispatch/4
  (elixir 1.18.4) src/elixir_compiler.erl:52: :elixir_compiler.compile/4
  (elixir 1.18.4) src/elixir_compiler.erl:39: :elixir_compiler.maybe_fast_compile/2
  (elixir 1.18.4) src/elixir_lexical.erl:13: :elixir_lexical.run/3
  (elixir 1.18.4) src/elixir_compiler.erl:17: :elixir_compiler.quoted/3
  (elixir 1.18.4) lib/module/parallel_checker.ex:120: Module.ParallelChecker.verify/1
  (elixir 1.18.4) lib/code.ex:1525: Code.require_file/2
  (mix 1.18.4) lib/mix/tasks/run.ex:148: Mix.Tasks.Run.run/5
  (mix 1.18.4) lib/mix/tasks/run.ex:87: Mix.Tasks.Run.run/1
  (mix 1.18.4) lib/mix/task.ex:495: anonymous fn/3 in Mix.Task.run_task/5
  (mix 1.18.4) lib/mix/task.ex:561: Mix.Task.run_alias/6
  (mix 1.18.4) lib/mix/cli.ex:107: Mix.CLI.run_task/2
  /usr/bin/mix:2: (file)
  (elixir 1.18.4) src/elixir_compiler.erl:77: :elixir_compiler.dispatch/4
  (elixir 1.18.4) src/elixir_compiler.erl:52: :elixir_compiler.compile/4
    (ash 3.5.24) lib/ash.ex:3441: Ash.bulk_destroy!/4
    priv/repo/seeds/01-artists.exs:16: (file)
    (elixir 1.18.4) lib/code.ex:1525: Code.require_file/2
    (mix 1.18.4) lib/mix/tasks/run.ex:148: Mix.Tasks.Run.run/5
    (mix 1.18.4) lib/mix/tasks/run.ex:87: Mix.Tasks.Run.run/1
    (mix 1.18.4) lib/mix/task.ex:495: anonymous fn/3 in Mix.Task.run_task/5
    (mix 1.18.4) lib/mix/task.ex:561: Mix.Task.run_alias/6
    (mix 1.18.4) lib/mix/cli.ex:107: Mix.CLI.run_task/2
    /usr/bin/mix:2: (file)

Any suggestions on how to get around this?

2

in the priv/repo/seeds/01-artists.exs file, I had to remove the strategy: :stream for the the ASH.bulk_destroy line. This will make it default to :atomic. According to the docs, Atomic bulk destroys are used when the subject of the bulk destroy is a query, which this is.