Class: GraphQL::Preload::Loader

Inherits:
Batch::Loader
  • Object
show all
Defined in:
lib/graphql/preload/loader.rb

Overview

Preloads ActiveRecord::Associations when called from the Preload::Instrument

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model, association, _scope_sql) ⇒ Loader

Returns a new instance of Loader.


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# File 'lib/graphql/preload/loader.rb', line 12

def initialize(model, association, _scope_sql)
  @association = association
  @model = model

  validate_association
end

Instance Attribute Details

#associationObject (readonly)

Returns the value of attribute association.


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# File 'lib/graphql/preload/loader.rb', line 6

def association
  @association
end

#modelObject (readonly)

Returns the value of attribute model.


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# File 'lib/graphql/preload/loader.rb', line 6

def model
  @model
end

#scopeObject

Returns the value of attribute scope.


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# File 'lib/graphql/preload/loader.rb', line 5

def scope
  @scope
end

Instance Method Details

#cache_key(record) ⇒ Object


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# File 'lib/graphql/preload/loader.rb', line 8

def cache_key(record)
  record.object_id
end

#load(record) ⇒ Object


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# File 'lib/graphql/preload/loader.rb', line 19

def load(record)
  unless record.is_a?(model)
    raise TypeError, "Loader for #{model} can't load associations for #{record.class} objects"
  end

  return Promise.resolve(record) if association_loaded?(record)
  super
end

#perform(records) ⇒ Object


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# File 'lib/graphql/preload/loader.rb', line 28

def perform(records)
  preload_association(records)
  records.each { |record| fulfill(record, record) }
end