Class: ActiveFedora::Associations::CollectionAssociation

Inherits:
Association
  • Object
show all
Defined in:
lib/active_fedora/associations/collection_association.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Attributes inherited from Association

#owner, #reflection, #target

Instance Method Summary collapse

Methods inherited from Association

#association_scope, #loaded!, #loaded?, #reload, #set_inverse_instance, #stale_target?, #target_scope

Constructor Details

#initialize(owner, reflection) ⇒ CollectionAssociation

Returns a new instance of CollectionAssociation.



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# File 'lib/active_fedora/associations/collection_association.rb', line 6

def initialize(owner, reflection)
  super

  construct_query
  @proxy = CollectionProxy.new(self)
end

Instance Attribute Details

#proxy ⇒ Object (readonly)

Returns the value of attribute proxy.



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# File 'lib/active_fedora/associations/collection_association.rb', line 4

def proxy
  @proxy
end

Instance Method Details

#<<(*records) ⇒ Object Also known as: push, concat

Add records to this association. Returns self so method calls may be chained. Since << flattens its argument list and inserts each record, push and concat behave identically.



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# File 'lib/active_fedora/associations/collection_association.rb', line 152

def <<(*records)
  result = true
  load_target unless loaded?

  records.flatten.each do |record|
    raise_on_type_mismatch(record)
    add_record_to_target_with_callbacks(record) do |r|
      result &&= insert_record(record)
    end
  end

  result && self
end

#add_record_to_target_with_callbacks(record) {|record| ... } ⇒ Object

Yields:

  • (record) 


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# File 'lib/active_fedora/associations/collection_association.rb', line 286

def add_record_to_target_with_callbacks(record)
  callback(:before_add, record)
  yield(record) if block_given?
  @target ||= [] unless loaded?
  if index = @target.index(record)
    @target[index] = record
  else
     @target << record
  end
  callback(:after_add, record)
#  set_inverse_instance(record, @owner)
  record
end

#add_to_target(record) {|record| ... } ⇒ Object

Yields:

  • (record) 


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# File 'lib/active_fedora/associations/collection_association.rb', line 300

def add_to_target(record)
#  transaction do
    callback(:before_add, record)
    yield(record) if block_given?

    if @reflection.options[:uniq] && index = @target.index(record)
      @target[index] = record
    else
      @target << record
    end

    callback(:after_add, record)
    set_inverse_instance(record)
 # end

  record
end

#build(attributes = {}, &block) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 138

def build(attributes = {}, &block)
  if attributes.is_a?(Array)
    attributes.collect { |attr| build(attr, &block) }
  else
    build_record(attributes) do |record|
      block.call(record) if block_given?
      add_to_target(record)
      set_belongs_to_association_for(record)
    end
  end
end

#count(options = {}) ⇒ Object

Count all records using solr. Construct options and pass them with scope to the target class’s count.



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# File 'lib/active_fedora/associations/collection_association.rb', line 230

def count(options = {})
  @reflection.klass.count(:conditions => @counter_query)
end

#create(attrs = {}) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 210

def create(attrs = {})
  if attrs.is_a?(Array)
    attrs.collect { |attr| create(attr) }
  else
    create_record(attrs) do |record|
      yield(record) if block_given?
      record.save
    end
  end
end

#create!(attrs = {}) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 221

def create!(attrs = {})
  create_record(attrs) do |record|
    yield(record) if block_given?
    record.save!
  end
end

#delete(*records) ⇒ Object

Removes records from this association calling before_remove and after_remove callbacks.

This method is abstract in the sense that delete_records has to be provided by descendants. Note this method does not imply the records are actually removed from the database, that depends precisely on delete_records. They are in any case removed from the collection.



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# File 'lib/active_fedora/associations/collection_association.rb', line 196

def delete(*records)
  delete_or_destroy(records, options[:dependent])
end

#delete_all ⇒ Object

Remove all records from this association

See delete for more info.



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# File 'lib/active_fedora/associations/collection_association.rb', line 172

def delete_all
  delete(load_target).tap do
    reset
    loaded!
  end
end

#destroy(*records) ⇒ Object

Destroy records and remove them from this association calling before_remove and after_remove callbacks.

Note that this method will always remove records from the database ignoring the :dependent option.



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# File 'lib/active_fedora/associations/collection_association.rb', line 205

def destroy(*records)
  records = find(records) if records.any? { |record| record.kind_of?(Fixnum) || record.kind_of?(String) }
  delete_or_destroy(records, :destroy)
end

#destroy_all ⇒ Object

Remove all records from this association

See delete for more info.



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# File 'lib/active_fedora/associations/collection_association.rb', line 182

def destroy_all
  destroy(load_target).tap do
    reset
    loaded!
  end
end

#empty? ⇒ Boolean

Returns true if the collection is empty.

If the collection has been loaded it is equivalent to collection. size.zero?. If the collection has not been loaded, it is equivalent to collection.count_records == 0. If the collection has not already been loaded and you are going to fetch the records anyway it is better to check collection.length.zero?.

Returns:

  • (Boolean) 


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# File 'lib/active_fedora/associations/collection_association.rb', line 100

def empty?
  if loaded?
    size.zero?
  else
    @target.blank? && count_records == 0
  end
end

#find(*args) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 62

def find(*args)
  scope.find(*args)
end

#find_target ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 252

def find_target
  # TODO: don't reify, just store the solr results and lazily reify.
  # For now, we set a hard limit of 1000 results.
  return ActiveFedora::SolrService.reify_solr_results(load_from_solr(rows: 1000))
end

#first(*args) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 66

def first(*args)
  first_or_last(:first, *args)
end

#ids_reader ⇒ Object

Implements the ids reader method, e.g. foo.item_ids for Foo.has_many :items



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# File 'lib/active_fedora/associations/collection_association.rb', line 36

def ids_reader
  if loaded?
    load_target.map do |record|
      record.pid
    end
  else
    load_from_solr.map do |solr_record|
      solr_record['id']
    end
  end
end

#ids_writer(ids) ⇒ Object

Implements the ids writer method, e.g. foo.item_ids= for Foo.has_many :items



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# File 'lib/active_fedora/associations/collection_association.rb', line 49

def ids_writer(ids)
  ids = Array(ids).reject { |id| id.blank? }
  replace(klass.find(ids))#.index_by { |r| r.id }.values_at(*ids))
  #TODO, like this when find() can return multiple records
  #send("#{reflection.name}=", reflection.klass.find(ids))
  #send("#{reflection.name}=", ids.collect { |id| reflection.klass.find(id)})
end

#include?(record) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_fedora/associations/collection_association.rb', line 121

def include?(record)
  if record.is_a?(reflection.klass)
    if record.new_record?
      target.include?(record)
    else
      loaded? ? target.include?(record) : scope.exists?(record)
    end
  else
    false
  end
end

#last(*args) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 70

def last(*args)
  first_or_last(:last, *args)
end

#load_from_solr(opts = Hash.new) ⇒ Object

Parameters:

  • opts (Hash) (defaults to: Hash.new) —

    Options that will be passed through to ActiveFedora::SolrService.query.



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# File 'lib/active_fedora/associations/collection_association.rb', line 280

def load_from_solr(opts = Hash.new)
  return [] if @finder_query.empty?
  solr_opts = {rows: opts.delete(:rows) || count}
  SolrService.query(@finder_query, solr_opts.merge(opts))
end

#load_target ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 234

def load_target
  if find_target?
    targets = []

    begin
      targets = find_target
    rescue ObjectNotFoundError => e
      ActiveFedora::Base.logger.error "Solr and Fedora may be out of sync:\n" + e.message
      reset
    end

    @target = merge_target_lists(targets, @target)
  end

  loaded!
  target
end

#merge_target_lists(loaded, existing) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 258

def merge_target_lists(loaded, existing)
  return loaded if existing.empty?
  return existing if loaded.empty?

  loaded.map do |f|
    i = existing.index(f)
    if i
      existing.delete_at(i).tap do |t|
        keys = ["id"] + t.changes.keys + (f.attribute_names - t.attribute_names)
        # FIXME: this call to attributes causes many NoMethodErrors
        attributes = f.attributes
        (attributes.keys - keys).each do |k|
          t.send("#{k}=", attributes[k])
        end
      end
    else
      f
    end
  end + existing
end

#null_scope? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_fedora/associations/collection_association.rb', line 324

def null_scope?
  owner.new_record? && !foreign_key_present?
end

#reader(opts = false) ⇒ Object

Implements the reader method, e.g. foo.items for Foo.has_many :items

Parameters:

  • opts (Boolean, Hash) (defaults to: false) —

    if true, force a reload

Options Hash (opts):

  • :response_format (Symbol) —

    can be ‘:solr’ to return a solr result.



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# File 'lib/active_fedora/associations/collection_association.rb', line 17

def reader(opts = false)
  if opts.kind_of?(Hash)
    if opts.delete(:response_format) == :solr
      return load_from_solr(opts) 
    end
    raise ArgumentError, "Hash parameter must include :response_format=>:solr (#{opts.inspect})"
  else
    force_reload = opts
  end
  reload if force_reload || stale_target?
  proxy
end

#replace(other_array) ⇒ Object

Replace this collection with other_array This will perform a diff and delete/add only records that have changed.



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# File 'lib/active_fedora/associations/collection_association.rb', line 110

def replace(other_array)
  other_array.each { |val| raise_on_type_mismatch(val) }

  load_target
  other   = other_array.size < 100 ? other_array : other_array.to_set
  current = @target.size < 100 ? @target : @target.to_set

  delete(@target.select { |v| !other.include?(v) })
  concat(other_array.select { |v| !current.include?(v) })
end

#reset ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 57

def reset
  reset_target!
  @loaded = false
end

#scope(opts = {}) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 318

def scope(opts = {})
  scope = super()
  scope.none! if opts.fetch(:nullify, true) && null_scope?
  scope
end

#size ⇒ Object

Returns the size of the collection

If the collection has been already loaded size and length are equivalent. If not and you are going to need the records anyway length will take one less query. Otherwise size is more efficient.

This method is abstract in the sense that it relies on count_records, which is a method descendants have to provide.



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# File 'lib/active_fedora/associations/collection_association.rb', line 82

def size
  if @owner.new_record? && @target
    @target.size
  elsif !loaded? && @target.is_a?(Array)
    unsaved_records = @target.select { |r| r.new_record? }
    unsaved_records.size + count_records
  else
    count_records
  end
end

#to_ary ⇒ Object Also known as: to_a 



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# File 'lib/active_fedora/associations/collection_association.rb', line 133

def to_ary
  load_target.dup
end

#writer(records) ⇒ Object

Implements the writer method, e.g. foo.items= for Foo.has_many :items



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# File 'lib/active_fedora/associations/collection_association.rb', line 31

def writer(records)
  replace(records)
end