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

#inversed, #owner, #reflection, #target

Instance Method Summary collapse

Methods inherited from Association

#association_scope, #initialize, #initialize_attributes, #loaded!, #loaded?, #reload, #reset_scope, #set_inverse_instance, #stale_target?, #target_scope

Constructor Details

This class inherits a constructor from ActiveFedora::Associations::Association

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

#add_to_target(record, skip_callbacks = false) {|record| ... } ⇒ Object

Yields:

  • (record) 


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# File 'lib/active_fedora/associations/collection_association.rb', line 257

def add_to_target(record, skip_callbacks = false)
  # Start transaction
  callback(:before_add, record) unless skip_callbacks
  yield(record) if block_given?

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

  callback(:after_add, record) unless skip_callbacks
  set_inverse_instance(record)
  # End transaction

  record
end

#any? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_fedora/associations/collection_association.rb', line 126

def any?
  if block_given?
    load_target.any? { |*block_args| yield(*block_args) }
  else
    !empty?
  end
end

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



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# File 'lib/active_fedora/associations/collection_association.rb', line 139

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

#concat(*records) ⇒ Object

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 151

def concat(*records)
  load_target unless owner.new_record?
  concat_records(records)
end

#concat_records(*records) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 156

def concat_records(*records)
  result = true

  records.flatten.each do |record|
    raise_on_type_mismatch!(record)
    add_to_target(record) do |_r|
      result &&= insert_record(record) unless owner.new_record?
    end
  end

  result && records
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 231

def count(_options = {})
  scope.count
end

#create(attrs = {}) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 211

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 222

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 197

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
  # TODO: load_target causes extra loads. Can't we just send delete requests?
  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 206

def destroy(*records)
  records = find(records) if records.any? { |record| record.is_a?(Integer) || record.is_a?(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 183

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 93

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

#find(*args) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 55

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

#first(*args) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 59

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 it discards any ids where the record it belongs to was marked for destruction.



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# File 'lib/active_fedora/associations/collection_association.rb', line 33

def ids_reader
  if loaded?
    load_target.reject(&:marked_for_destruction?).map(&:id)
  else
    load_from_solr.map(&:id)
  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 42

def ids_writer(ids)
  ids = Array(ids).reject(&: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 114

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 63

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

#load_from_solr(opts = {}) ⇒ Object

Parameters:

  • opts (Hash) (defaults to: {}) —

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



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# File 'lib/active_fedora/associations/collection_association.rb', line 249

def load_from_solr(opts = {})
  finder_query = construct_query
  return [] if finder_query.empty?
  rows = opts.delete(:rows) { count }
  return [] if rows.zero?
  SolrService.query(finder_query, { rows: rows }.merge(opts))
end

#load_target ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 241

def load_target
  @target = merge_target_lists(find_target, @target) if find_target?

  loaded!
  target
end

#null_scope? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_fedora/associations/collection_association.rb', line 281

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 9

def reader(opts = false)
  if opts.is_a?(Hash)
    return load_from_solr(opts) if opts.delete(:response_format) == :solr
    raise ArgumentError, "Hash parameter must include :response_format=>:solr (#{opts.inspect})"
  else
    force_reload = opts
  end
  reload if force_reload || stale_target?
  if null_scope?
    # Cache the proxy separately before the owner has an id
    # or else a post-save proxy will still lack the id
    @null_proxy ||= CollectionProxy.new(self)
  else
    @proxy ||= CollectionProxy.new(self)
  end
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 103

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

  load_target
  deletions = @target - other_array
  additions = other_array - @target

  delete(deletions)
  concat(additions)
end

#reset ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 50

def reset
  super
  @target = []
end

#scope(opts = {}) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 275

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

#select(_select = nil, &block) ⇒ Object 



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# File 'lib/active_fedora/associations/collection_association.rb', line 285

def select(_select = nil, &block)
  to_a.select(&block)
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 75

def size
  if !find_target? || loaded?
    target.size
  elsif !loaded? && target.is_a?(Array)
    unsaved_records = target.select(&:new_record?)
    unsaved_records.size + count_records
  else
    count_records
  end
end

#target=(target) ⇒ Object

Sets the target of this proxy to \target, and the loaded flag to true.



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# File 'lib/active_fedora/associations/collection_association.rb', line 236

def target=(target)
  @target = [target]
  loaded!
end

#to_ary ⇒ Object Also known as: to_a 



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# File 'lib/active_fedora/associations/collection_association.rb', line 134

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 27

def writer(records)
  replace(records)
end