Class: ActiveFedora::Relation

Inherits:
Object
  • Object
show all
Defined in:
lib/active_fedora/relation.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass) ⇒ Relation

Returns a new instance of Relation.



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# File 'lib/active_fedora/relation.rb', line 11

def initialize(klass)
  @klass = klass
  @loaded = false
  self.where_values = []
  self.order_values = []
end

Instance Attribute Details

#limit_value ⇒ Object

Returns the value of attribute limit_value.



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# File 'lib/active_fedora/relation.rb', line 9

def limit_value
  @limit_value
end

#loaded ⇒ Object (readonly) Also known as: loaded?

Returns the value of attribute loaded.



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# File 'lib/active_fedora/relation.rb', line 6

def loaded
  @loaded
end

#order_values ⇒ Object

Returns the value of attribute order_values.



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# File 'lib/active_fedora/relation.rb', line 9

def order_values
  @order_values
end

#where_values ⇒ Object

Returns the value of attribute where_values.



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# File 'lib/active_fedora/relation.rb', line 9

def where_values
  @where_values
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/active_fedora/relation.rb', line 182

def ==(other)
  case other
  when Relation
    other.where_values == where_values
  when Array
    to_a == other
  end
end

#all(*args) ⇒ Object

A convenience wrapper for find(:all, *args). You can pass in all the same arguments to this method as you can to find(:all).



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# File 'lib/active_fedora/relation.rb', line 149

def all(*args)
  args.any? ? apply_finder_options(args.first).to_a : to_a
end

#count(*args) ⇒ Object

Get a count of the number of objects from solr Takes :conditions as an argument



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# File 'lib/active_fedora/relation.rb', line 169

def count(*args)
  return apply_finder_options(args.first).count  if args.any?
  opts = {}
  opts[:rows] = @limit_value if @limit_value
  opts[:sort] = @order_values if @order_values
  
  query = @where_values.present? ? @where_values : {}
  @klass.calculate :count, query, opts

end

#delete_all(conditions = nil) ⇒ Object 



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# File 'lib/active_fedora/relation.rb', line 229

def delete_all(conditions = nil)
  if conditions
    where(conditions).delete_all
  else
    to_a.each {|object| object.delete }.tap { reset }.size
  end
end

#destroy_all(conditions = nil) ⇒ Object

Destroys the records matching conditions by instantiating each record and calling its destroy method. Each object’s callbacks are executed (including :dependent association options and before_destroy/after_destroy Observer methods). Returns the collection of objects that were destroyed; each will be frozen, to reflect that no changes should be made (since they can’t be persisted).

Note: Instantiation, callback execution, and deletion of each record can be time consuming when you’re removing many records at once. It generates at least one fedora DELETE query per record (or possibly more, to enforce your callbacks). If you want to delete many rows quickly, without concern for their associations or callbacks, use delete_all instead.

Parameters

  • conditions - A string, array, or hash that specifies which records to destroy. If omitted, all records are destroyed. See the Conditions section in the ActiveFedora::Relation#where for more information.

Examples

Person.destroy_all(:status_s => "inactive")
Person.where(:age_i => 18).destroy_all



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# File 'lib/active_fedora/relation.rb', line 221

def destroy_all(conditions = nil)
  if conditions
    where(conditions).destroy_all
  else
    to_a.each {|object| object.destroy }.tap { reset }.size
  end
end

#find(*args) ⇒ Object

Returns an Array of objects of the Class that find is being called on

@param args either a pid or :all or a hash of conditions

Parameters:

  • args (Hash) —

    a customizable set of options

Options Hash (*args):

  • :rows (Integer) —

    when :all is passed, the maximum number of rows to load from solr

  • :cast (Boolean) —

    when true, examine the model and cast it to the first known cModel



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# File 'lib/active_fedora/relation.rb', line 100

def find(*args)
  return to_a.find { |*block_args| yield(*block_args) } if block_given?
  options = args.extract_options!

  # TODO is there any reason not to cast?
  cast = options.delete(:cast)
  if options[:sort]
    # Deprecate sort sometime?
    sort = options.delete(:sort) 
    options[:order] ||= sort if sort.present?
  end

  if options.present?
    options = args.first unless args.empty?
    options = {conditions: options}
    apply_finder_options(options).all
  else
    case args.first
    when :first, :last, :all
      send(args.first)
    else
      find_with_ids(args, cast)
    end
  end
end

#find_some(ids, cast) ⇒ Object 



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# File 'lib/active_fedora/relation.rb', line 143

def find_some(ids, cast)
  ids.map{|id| @klass.find_one(id, cast)}
end

#find_with_ids(ids, cast) ⇒ Object 



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# File 'lib/active_fedora/relation.rb', line 126

def find_with_ids(ids, cast)
  expects_array = ids.first.kind_of?(Array)
  return ids.first if expects_array && ids.first.empty?

  ids = ids.flatten.compact.uniq

  case ids.size
  when 0
    raise ArgumentError, "Couldn't find #{@klass.name} without an ID"
  when 1
    result = @klass.find_one(ids.first, cast)
    expects_array ? [ result ] : result
  else
    find_some(ids, cast)
  end
end

#first ⇒ Object

Returns the first records that was found.

Examples:

Person.where(name_t: 'Jones').first
  => #<Person @id="foo:123" @name='Jones' ... >


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# File 'lib/active_fedora/relation.rb', line 30

def first
  if loaded?
    @records.first
  else
    @first ||= limit(1).to_a[0]
  end
end

#inspect ⇒ Object 



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# File 'lib/active_fedora/relation.rb', line 191

def inspect
  to_a.inspect
end

#last ⇒ Object

Returns the last record sorted by id. ID was chosen because this mimics how ActiveRecord would achieve the same behavior.

Examples:

Person.where(name_t: 'Jones').last
  => #<Person @id="foo:123" @name='Jones' ... >


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# File 'lib/active_fedora/relation.rb', line 44

def last
  if loaded?
    @records.last
  else
    @last ||= order('id desc').limit(1).to_a[0]
  end
end

#limit(value) ⇒ Object

Limits the number of returned records to the value specified

Examples:

Person.where(name_t: 'Jones').limit(10)
  => [#<Person @id="foo:123" @name='Jones'>, #<Person @id="foo:125" @name='Jones'>, ...]

Parameters:

  • [Integer] (Hash) —

    a customizable set of options



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# File 'lib/active_fedora/relation.rb', line 59

def limit(value)
  relation = clone
  relation.limit_value = value
  relation
end

#order(*args) ⇒ Object

Order the returned records by the field and direction provided

Examples:

Person.where(occupation_s: 'Plumber').order('name_t desc', 'color_t asc')
  => [#<Person @id="foo:123" @name='Luigi'>, #<Person @id="foo:125" @name='Mario'>, ...]

Parameters:

  • [Array<String>] (Hash) —

    a customizable set of options



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# File 'lib/active_fedora/relation.rb', line 86

def order(*args)
  return self if args.blank?

  relation = clone
  relation.order_values += args.flatten
  relation
end

#reset ⇒ Object 



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# File 'lib/active_fedora/relation.rb', line 18

def reset
  @first = @loaded = nil
  @records = []
  self
end

#to_a ⇒ Object 



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# File 'lib/active_fedora/relation.rb', line 155

def to_a
  return @records if loaded?
  args = {} #:cast=>true}
  args[:rows] = @limit_value if @limit_value
  args[:sort] = @order_values if @order_values
  
  query = @where_values.present? ? @where_values : {}
  @records = @klass.to_enum(:find_each, query, args).to_a

  @records
end

#where(opts) ⇒ Object

Limits the returned records to those that match the provided search conditions

Examples:

Person.where(name_t: 'Mario', occupation_s: 'Plumber')
  => [#<Person @id="foo:123" @name='Mario'>, #<Person @id="foo:125" @name='Mario'>, ...]

Parameters:

  • [Hash] (Hash) —

    a customizable set of options



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# File 'lib/active_fedora/relation.rb', line 72

def where(opts)
  return self if opts.blank?
  relation = clone
  relation.where_values = opts
  relation
end