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module ActiveRecord
class Relation
delegate :to_sql, :to => :relation
delegate :length, :collect, :find, :map, :each, :to => :to_a
attr_reader :relation, :klass
def initialize(klass, relation, readonly = false, preload = [], eager_load = [])
@klass, @relation = klass, relation
@readonly = readonly
@associations_to_preload = preload
@eager_load_associations = eager_load
end
def preload(associations)
@associations_to_preload << associations
self
end
def eager_load(associations)
@eager_load_associations += Array.wrap(associations)
self
end
def readonly
@readonly = true
self
end
def to_a
records = if @eager_load_associations.any?
catch :invalid_query do
return @klass.send(:find_with_associations, {
:select => @relation.send(:select_clauses).join(', '),
:joins => @relation.joins(relation),
:group => @relation.send(:group_clauses).join(', '),
:order => @relation.send(:order_clauses).join(', '),
:conditions => @relation.send(:where_clauses).join("\n\tAND "),
:limit => @relation.taken,
:offset => @relation.skipped
},
ActiveRecord::Associations::ClassMethods::JoinDependency.new(@klass, @eager_load_associations, nil))
end
[]
else
@klass.find_by_sql(@relation.to_sql)
end
@associations_to_preload.each {|associations| @klass.send(:preload_associations, records, associations) }
records.each { |record| record.readonly! } if @readonly
records
end
def first
@relation = @relation.take(1)
to_a.first
end
def select(selects)
selects.blank? ? self : create_new_relation(@relation.project(selects))
end
def group(groups)
groups.blank? ? self : create_new_relation(@relation.group(groups))
end
def order(orders)
orders.blank? ? self : create_new_relation(@relation.order(orders))
end
def limit(limits)
limits.blank? ? self : create_new_relation(@relation.take(limits))
end
def offset(offsets)
offsets.blank? ? self : create_new_relation(@relation.skip(offsets))
end
def on(join)
join.blank? ? self : create_new_relation(@relation.on(join))
end
def joins(join, join_type = nil)
if join.blank?
self
else
join = case join
when String
@relation.join(join)
when Hash, Array, Symbol
if @klass.send(:array_of_strings?, join)
@relation.join(join.join(' '))
else
@relation.join(@klass.send(:build_association_joins, join))
end
else
@relation.join(join, join_type)
end
create_new_relation(join)
end
end
def conditions(conditions)
if conditions.blank?
self
else
conditions = @klass.send(:merge_conditions, conditions) if [String, Hash, Array].include?(conditions.class)
create_new_relation(@relation.where(conditions))
end
end
def respond_to?(method)
@relation.respond_to?(method) || Array.method_defined?(method) || super
end
private
def method_missing(method, *args, &block)
if @relation.respond_to?(method)
@relation.send(method, *args, &block)
elsif Array.method_defined?(method)
to_a.send(method, *args, &block)
else
super
end
end
def create_new_relation(relation)
Relation.new(@klass, relation, @readonly, @associations_to_preload, @eager_load_associations)
end
end
end
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