Class: ActiveRecord::Associations::HasManyAssociation

Inherits:
AssociationCollection show all
Defined in:
lib/active_record/associations/has_many_association.rb

Overview

:nodoc:

Instance Attribute Summary

Attributes inherited from AssociationProxy

#reflection

Instance Method Summary collapse

Methods inherited from AssociationCollection

#<<, #clear, #create, #delete, #delete_all, #destroy_all, #empty?, #length, #replace, #reset, #size, #sum, #to_ary, #uniq

Methods inherited from AssociationProxy

#===, #aliased_table_name, #conditions, #loaded, #loaded?, #proxy_owner, #proxy_reflection, #proxy_respond_to?, #proxy_target, #reload, #reset, #respond_to?, #target, #target=

Constructor Details

#initialize(owner, reflection) ⇒ HasManyAssociation

Returns a new instance of HasManyAssociation.



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# File 'lib/active_record/associations/has_many_association.rb', line 4

def initialize(owner, reflection)
  super
  construct_sql
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object (protected) 



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# File 'lib/active_record/associations/has_many_association.rb', line 96

def method_missing(method, *args, &block)
  if @target.respond_to?(method) || (!@reflection.klass.respond_to?(method) && Class.respond_to?(method))
    super
  else
    create_scoping = {}
    set_belongs_to_association_for(create_scoping)

    @reflection.klass.with_scope(
      :create => create_scoping,
      :find => {
        :conditions => @finder_sql, 
        :joins      => @join_sql, 
        :readonly   => false
      }
    ) do
      @reflection.klass.send(method, *args, &block)
    end
  end
end

Instance Method Details

#build(attributes = {}) ⇒ Object 



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# File 'lib/active_record/associations/has_many_association.rb', line 9

def build(attributes = {})
  if attributes.is_a?(Array)
    attributes.collect { |attr| build(attr) }
  else
    record = @reflection.klass.new(attributes)
    set_belongs_to_association_for(record)
    
    @target ||= [] unless loaded?
    @target << record
    
    record
  end
end

#count(*args) ⇒ Object

Count the number of associated records. All arguments are optional.



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# File 'lib/active_record/associations/has_many_association.rb', line 43

def count(*args)
  if @reflection.options[:counter_sql]
    @reflection.klass.count_by_sql(@counter_sql)
  elsif @reflection.options[:finder_sql]
    @reflection.klass.count_by_sql(@finder_sql)
  else
    column_name, options = @reflection.klass.send(:construct_count_options_from_legacy_args, *args)          
    options[:conditions] = options[:conditions].nil? ?
      @finder_sql :
      @finder_sql + " AND (#{sanitize_sql(options[:conditions])})"
    options[:include] = @reflection.options[:include]

    @reflection.klass.count(column_name, options)
  end
end

#find(*args) ⇒ Object 



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# File 'lib/active_record/associations/has_many_association.rb', line 59

def find(*args)
  options = Base.send(:extract_options_from_args!, args)

  # If using a custom finder_sql, scan the entire collection.
  if @reflection.options[:finder_sql]
    expects_array = args.first.kind_of?(Array)
    ids = args.flatten.compact.uniq

    if ids.size == 1
      id = ids.first
      record = load_target.detect { |record| id == record.id }
      expects_array ? [ record ] : record
    else
      load_target.select { |record| ids.include?(record.id) }
    end
  else
    conditions = "#{@finder_sql}"
    if sanitized_conditions = sanitize_sql(options[:conditions])
      conditions << " AND (#{sanitized_conditions})"
    end
    options[:conditions] = conditions

    if options[:order] && @reflection.options[:order]
      options[:order] = "#{options[:order]}, #{@reflection.options[:order]}"
    elsif @reflection.options[:order]
      options[:order] = @reflection.options[:order]
    end

    merge_options_from_reflection!(options)

    # Pass through args exactly as we received them.
    args << options
    @reflection.klass.find(*args)
  end
end

#find_all(runtime_conditions = nil, orderings = nil, limit = nil, joins = nil) ⇒ Object

DEPRECATED.



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# File 'lib/active_record/associations/has_many_association.rb', line 24

def find_all(runtime_conditions = nil, orderings = nil, limit = nil, joins = nil)
  if @reflection.options[:finder_sql]
    @reflection.klass.find_by_sql(@finder_sql)
  else
    conditions = @finder_sql
    conditions += " AND (#{sanitize_sql(runtime_conditions)})" if runtime_conditions
    orderings ||= @reflection.options[:order]
    @reflection.klass.find_all(conditions, orderings, limit, joins)
  end
end

#find_first(conditions = nil, orderings = nil) ⇒ Object

DEPRECATED. Find the first associated record. All arguments are optional.



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# File 'lib/active_record/associations/has_many_association.rb', line 37

def find_first(conditions = nil, orderings = nil)
  find_all(conditions, orderings, 1).first
end