2007-01-22 14:43:50 +01:00
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module ActiveRecord
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module Associations
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class AssociationProxy #:nodoc:
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attr_reader :reflection
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alias_method :proxy_respond_to?, :respond_to?
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alias_method :proxy_extend, :extend
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2007-02-09 09:04:31 +01:00
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delegate :to_param, :to => :proxy_target
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instance_methods.each { |m| undef_method m unless m =~ /(^__|^nil\?$|^send$|proxy_)/ }
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2007-01-22 14:43:50 +01:00
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def initialize(owner, reflection)
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@owner, @reflection = owner, reflection
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2007-02-09 09:04:31 +01:00
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Array(reflection.options[:extend]).each { |ext| proxy_extend(ext) }
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2007-01-22 14:43:50 +01:00
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reset
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end
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2007-02-09 09:04:31 +01:00
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def proxy_owner
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@owner
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end
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def proxy_reflection
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@reflection
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end
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def proxy_target
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@target
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end
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2007-01-22 14:43:50 +01:00
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def respond_to?(symbol, include_priv = false)
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proxy_respond_to?(symbol, include_priv) || (load_target && @target.respond_to?(symbol, include_priv))
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end
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# Explicitly proxy === because the instance method removal above
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# doesn't catch it.
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def ===(other)
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load_target
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other === @target
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end
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def aliased_table_name
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@reflection.klass.table_name
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end
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def conditions
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2007-02-09 09:04:31 +01:00
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@conditions ||= interpolate_sql(sanitize_sql(@reflection.options[:conditions])) if @reflection.options[:conditions]
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2007-01-22 14:43:50 +01:00
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end
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alias :sql_conditions :conditions
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def reset
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@target = nil
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@loaded = false
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end
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def reload
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reset
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load_target
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end
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def loaded?
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@loaded
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end
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def loaded
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@loaded = true
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end
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def target
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@target
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end
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def target=(target)
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@target = target
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loaded
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end
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protected
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def dependent?
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@reflection.options[:dependent] || false
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end
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def quoted_record_ids(records)
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records.map { |record| record.quoted_id }.join(',')
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end
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def interpolate_sql_options!(options, *keys)
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keys.each { |key| options[key] &&= interpolate_sql(options[key]) }
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end
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def interpolate_sql(sql, record = nil)
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@owner.send(:interpolate_sql, sql, record)
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end
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def sanitize_sql(sql)
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@reflection.klass.send(:sanitize_sql, sql)
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end
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def extract_options_from_args!(args)
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@owner.send(:extract_options_from_args!, args)
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end
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def set_belongs_to_association_for(record)
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if @reflection.options[:as]
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record["#{@reflection.options[:as]}_id"] = @owner.id unless @owner.new_record?
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record["#{@reflection.options[:as]}_type"] = @owner.class.base_class.name.to_s
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else
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record[@reflection.primary_key_name] = @owner.id unless @owner.new_record?
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end
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end
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def merge_options_from_reflection!(options)
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options.reverse_merge!(
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:group => @reflection.options[:group],
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:limit => @reflection.options[:limit],
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:offset => @reflection.options[:offset],
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:joins => @reflection.options[:joins],
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:include => @reflection.options[:include],
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:select => @reflection.options[:select]
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)
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end
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private
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def method_missing(method, *args, &block)
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2007-02-09 09:04:31 +01:00
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if load_target
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@target.send(method, *args, &block)
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end
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2007-01-22 14:43:50 +01:00
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end
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def load_target
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2007-02-09 09:04:31 +01:00
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return nil unless defined?(@loaded)
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if !loaded? and (!@owner.new_record? || foreign_key_present)
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@target = find_target
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2007-01-22 14:43:50 +01:00
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end
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2007-02-09 09:04:31 +01:00
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@loaded = true
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@target
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rescue ActiveRecord::RecordNotFound
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reset
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2007-01-22 14:43:50 +01:00
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end
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# Can be overwritten by associations that might have the foreign key available for an association without
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# having the object itself (and still being a new record). Currently, only belongs_to present this scenario.
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def foreign_key_present
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false
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end
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def raise_on_type_mismatch(record)
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unless record.is_a?(@reflection.klass)
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raise ActiveRecord::AssociationTypeMismatch, "#{@reflection.class_name} expected, got #{record.class}"
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end
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end
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2007-02-09 09:04:31 +01:00
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# Array#flatten has problems with recursive arrays. Going one level deeper solves the majority of the problems.
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def flatten_deeper(array)
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array.collect { |element| element.respond_to?(:flatten) ? element.flatten : element }.flatten
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end
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2007-01-22 14:43:50 +01:00
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end
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end
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end
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