Enum value is not searchable

[khrisnagunanasurya-iav]

• What were you trying to do? I have a model that has a CEFR level {a1: 0, a2: 1, b1: 2, b2: 3, c1: 4, c2: 5}, and I want to make it to be searchable from the dashboard.

Here is my model dashboard

class ClassroomDashboard < Administrate::BaseDashboard
  ATTRIBUTE_TYPES = {
    ...
    level: Field::Select.with_options(searchable: true, collection: ->(field) { field.resource.class.send(field.attribute.to_s.pluralize).keys }),
    ...
  }
...

• What did you end up with (logs, or, even better, example apps are great!)? On the search bar, I tried using these

• level:a1
• level:0
• a1

but none of them are working, is this a bug or feature?

• What versions are you running?
  • Rails 6.1.1
  • administrate 0.15.0

[pablobm]

Do you have SQL logs, to see what the search is actually trying to do?

[hirokihokari]

For anyone who got here later, as of 0.16.0, it seems to be doing "%<term>%" in WHERE LIKE clause. In above case, meaning it's searching with actual value. In above case, simply 0 would result in records for a1: 0.

And remember, if you define the enum without values assigned, e.g. enum [:a1, :a2, :b1, :b2, :c1, :c2] would generate values according to the ordinal; a1 would have 0, a2 would have 1, etc.

[pablobm]

The SQL is put together around these lines:

https://github.com/thoughtbot/administrate/blob/3739c6436feee531153f56b5d5650f9f6a6e8940/lib/administrate/search.rb#L87-L95

I think it should be possible to alter this to generate a different string in the case of an enum. This will probably require reading @scoped_resource in order to figure out which attribute is an enum and then provide the required SQL... I think!

Any brave soul willing to have a go at this and provide a PR? :slightly_smiling_face:

[pablobm]

Well, this is probably related to https://github.com/thoughtbot/administrate/issues/1939, and how Enums are a bit special.

[littleforest]

Here is an example of a customized search with enum where the enum field cannot be null:

# app/models/source_file.rb
class SourceFile < ApplicationRecord
  enum :status, [:pending, :completed]
end

# app/controllers/admin/source_files_controller.rb

module Admin
  class SourceFilesController < Admin::ApplicationController
    def filter_resources(resources, search_term:)
      Administrate::SourceFileSearch.new(
        resources,
        dashboard,
        search_term
      ).run
    end
  end
end

module Administrate
  class SourceFileSearch < Search
    private

    def query_template
      super
        .split(" OR ")
        .push("status = ?")
        .join(" OR ")
    end

    def query_values
      array = super
      term = array.first
      array + [SourceFile.statuses[term.parameterize(separator: "_")]]
    end
  end
end