AE
Ash Elixir•3w ago
D B Simmons

Spark - reading child options

Hi All I have defined the following DSL 
  crud do
    attributes([:name, :email, :joined])
    root_url("/crud")

    read do
      layout(&AshCrudWeb.Layouts.app/1)
    end
  end
  crud do
    attributes([:name, :email, :joined])
    root_url("/crud")

    read do
      layout(&AshCrudWeb.Layouts.app/1)
    end
  end
I can use the following to get the value of root_url... 
    root_url =
      Spark.Dsl.Extension.get_opt(resource, [:crud], :root_url, nil, true)
    root_url =
      Spark.Dsl.Extension.get_opt(resource, [:crud], :root_url, nil, true)
Reading the docs I thought I could get the value of layout with.... 
    layout = Spark.Dsl.Extension.get_opt(resource, [:crud, :read], :layout, nil, true)
    layout = Spark.Dsl.Extension.get_opt(resource, [:crud, :read], :layout, nil, true)
but this always returns nil despite the fact the value is configured. I've read the Spark docs and I'm getting myself confused (easily done). Any pointers as to what I'm doing wrong? Many thanks in advance.
4 Replies
ZachDaniel
ZachDaniel•3w ago
Can I see the DSL? is read an entity or a section?
D B Simmons
D B SimmonsOP•3w ago
The DSL is.... 
defmodule AshCrud.Dsl do
  defmodule Read do
    defstruct [:layout]
  end



  @read %Spark.Dsl.Entity{
    name: :read,
    target: Read,
    describe: "Define attribute for a CRUD read",
    schema: [
      layout: [
        type: {:fun, 1}
      ]
    ]
  }
  @crud %Spark.Dsl.Section{
    name: :crud,
    schema: [
      attributes: [
        type: {:list, :atom},
        required: true,
        doc: "A list of atoms representing the attributes to use in the CRUD pages"
      ],
      root_url: [
        type: :string,
        required: true,
        doc: "The base of the url used for routing to CRUD pages"
      ]
    ],
    entities: [
      @create,
      @read,
      @update,
      @delete
    ]
  }


  use Spark.Dsl.Extension,
    sections: [@crud],
    verifiers: [
      AshCrud.Verifiers.VerifyAttributes
    ]
end
defmodule AshCrud.Dsl do
  defmodule Read do
    defstruct [:layout]
  end



  @read %Spark.Dsl.Entity{
    name: :read,
    target: Read,
    describe: "Define attribute for a CRUD read",
    schema: [
      layout: [
        type: {:fun, 1}
      ]
    ]
  }
  @crud %Spark.Dsl.Section{
    name: :crud,
    schema: [
      attributes: [
        type: {:list, :atom},
        required: true,
        doc: "A list of atoms representing the attributes to use in the CRUD pages"
      ],
      root_url: [
        type: :string,
        required: true,
        doc: "The base of the url used for routing to CRUD pages"
      ]
    ],
    entities: [
      @create,
      @read,
      @update,
      @delete
    ]
  }


  use Spark.Dsl.Extension,
    sections: [@crud],
    verifiers: [
      AshCrud.Verifiers.VerifyAttributes
    ]
end
ZachDaniel
ZachDaniel•3w ago
Entities are stored and retrieved differently You'd ask for the entities inside of the crud section You can derive that all with Spark.InfoGenerator, which defines functions you can look at in iex etc.
D B Simmons
D B SimmonsOP•3w ago
Thanks @ZachDaniel - I'll give it a go - appreciate the pointer.

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