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module ActiveRecord
class Relation
delegate :delete, :to_sql, :to => :relation
CLAUSES_METHODS = ["project", "group", "order", "take", "skip"].freeze
attr_reader :relation, :klass
def initialize(klass, table = nil)
@klass = klass
@relation = Arel::Table.new(table || @klass.table_name)
end
def to_a
@klass.find_by_sql(@relation.to_sql)
end
def first
@relation = @relation.take(1)
to_a.first
end
for clause in CLAUSES_METHODS
class_eval %{
def #{clause}(_#{clause})
@relation = @relation.#{clause}(_#{clause}) if _#{clause}
self
end
}
end
def join(joins)
@relation = @relation.join(@klass.send(:construct_join, joins, nil)) if !joins.blank?
self
end
def where(conditions)
if !conditions.blank?
conditions = @klass.send(:merge_conditions, conditions) if [String, Hash, Array].include?(conditions.class)
@relation = @relation.where(conditions)
end
self
end
private
def method_missing(method, *args, &block)
if @relation.respond_to?(method)
@relation.send(method, *args, &block)
elsif Array.instance_methods.include?(method.to_s)
to_a.send(method, *args, &block)
end
end
end
end
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