Class: Hyrax::IiifManifestPresenter

Inherits:
Draper::Decorator
  • Object
show all
Defined in:
app/presenters/hyrax/iiif_manifest_presenter.rb

Overview

This presenter wraps objects in the interface required by ‘IIIFManifiest`. It will accept either a Work-like resource or a SolrDocument.

Examples:

with a work


monograph = Monograph.new
presenter = IiifManifestPresenter.new(monograph)
presenter.title # => []

monograph.title = ['Comet in Moominland']
presenter.title # => ['Comet in Moominland']

See Also:

Defined Under Namespace

Classes: DisplayImagePresenter, Factory, NullAbility

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#ability ⇒ #can?

Returns:

  • (#can?) 


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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 40

def ability
  @ability ||= NullAbility.new
end

#hostname=(value) ⇒ Object

Sets the attribute hostname

Parameters:

  • value —

    the value to set the attribute hostname to.



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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 26

attr_writer :ability, :hostname

Class Method Details

.for(model) ⇒ Object

Parameters:



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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 31

def for(model)
  klass = model.file_set? ? DisplayImagePresenter : IiifManifestPresenter

  klass.new(model)
end

Instance Method Details

#description ⇒ String

Returns:

  • (String) 


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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 46

def description
  Array(super).first || ''
end

#file_set? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 52

def file_set?
  model.try(:file_set?) || Array(model[:has_model_ssim]).include?('FileSet')
end

#file_set_presenters ⇒ Array<DisplayImagePresenter>

Returns:



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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 58

def file_set_presenters
  member_presenters.select(&:file_set?)
end

#manifest_metadata ⇒ Array<Hash{String => String}>

TODO:

should this use the simple_form i18n keys?! maybe the manifest needs its own?

IIIF metadata for inclusion in the manifest

Called by the `iiif_manifest` gem to add metadata

Returns:

  • (Array<Hash{String => String}>) —

    array of metadata hashes



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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 70

def manifest_metadata
  metadata_fields.map do |field_name|
    {
      'label' => I18n.t("simple_form.labels.defaults.#{field_name}"),
      'value' => Array(self[field_name]).map { |value| scrub(value.to_s) }
    }
  end
end

#manifest_url ⇒ String

Returns the URL where the manifest can be found.

Returns:

  • (String) —

    the URL where the manifest can be found



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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 81

def manifest_url
  return '' if id.blank?

  Rails.application.routes.url_helpers.polymorphic_url([:manifest, model], host: hostname)
end

#member_ids ⇒ Array<#to_s>

Returns:

  • (Array<#to_s>) 


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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 89

def member_ids
  Hyrax::SolrDocument::OrderedMembers.decorate(model).ordered_member_ids
end

#member_presenters ⇒ Array<IiifManifestPresenter>

Note:

cache member presenters to avoid querying repeatedly; we expect this presenter to live only as long as the request.

Note:

skips presenters for objects the current ‘@ability` cannot read. the default ability has all permissions.

Returns:



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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 101

def member_presenters
  @member_presenters_cache ||= Factory.build_for(ids: member_ids, presenter_class: self.class).map do |presenter|
    next unless ability.can?(:read, presenter.model)

    presenter.hostname = hostname
    presenter.ability  = ability
    presenter
  end.compact
end

#sequence_rendering ⇒ Array<Hash{String => String}>

Returns:

  • (Array<Hash{String => String}>) 


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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 113

def sequence_rendering
  Array(try(:rendering_ids)).map do |file_set_id|
    rendering = file_set_presenters.find { |p| p.id == file_set_id }
    next unless rendering

    { '@id' => Hyrax::Engine.routes.url_helpers.download_url(rendering.id, host: hostname),
      'format' => rendering.mime_type.present? ? rendering.mime_type : I18n.t("hyrax.manifest.unknown_mime_text"),
      'label' => I18n.t("hyrax.manifest.download_text") + (rendering.label || '') }
  end.flatten
end

#version ⇒ String

Note:

ideally, this value will be cheap to retrieve, and will reliably change any time the manifest JSON will change. the current implementation is more blunt than this, changing only when the work itself changes.

Returns a string tag suitable for cache keys for this manifiest.

Returns:

  • (String) —

    a string tag suitable for cache keys for this manifiest



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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 142

def version
  object.try(:modified_date)&.to_s || ''
end

#work? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 126

def work?
  object.try(:work?) || !file_set?
end

#work_presenters ⇒ Array<IiifManifestPresenter>

Returns:



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# File 'app/presenters/hyrax/iiif_manifest_presenter.rb', line 132

def work_presenters
  member_presenters.select(&:work?)
end