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module ActiveRecord
module QueryMethods
def preload(*associations)
spawn.tap {|r| r.preload_associations += Array.wrap(associations) }
end
def eager_load(*associations)
spawn.tap {|r| r.eager_load_associations += Array.wrap(associations) }
end
def readonly(status = true)
spawn.tap {|r| r.readonly = status }
end
def select(selects)
if selects.present?
relation = spawn(@relation.project(selects))
relation.readonly = @relation.joins(relation).present? ? false : @readonly
relation
else
spawn
end
end
def from(from)
from.present? ? spawn(@relation.from(from)) : spawn
end
def having(*args)
return spawn if args.blank?
if [String, Hash, Array].include?(args.first.class)
havings = @klass.send(:merge_conditions, args.size > 1 ? Array.wrap(args) : args.first)
else
havings = args.first
end
spawn(@relation.having(havings))
end
def group(groups)
groups.present? ? spawn(@relation.group(groups)) : spawn
end
def order(orders)
orders.present? ? spawn(@relation.order(orders)) : spawn
end
def lock(locks = true)
case locks
when String
spawn(@relation.lock(locks))
when TrueClass, NilClass
spawn(@relation.lock)
else
spawn
end
end
def reverse_order
relation = spawn
relation.instance_variable_set(:@orders, nil)
order_clause = @relation.send(:order_clauses).join(', ')
if order_clause.present?
relation.order(reverse_sql_order(order_clause))
else
relation.order("#{@klass.table_name}.#{@klass.primary_key} DESC")
end
end
def limit(limits)
limits.present? ? spawn(@relation.take(limits)) : spawn
end
def offset(offsets)
offsets.present? ? spawn(@relation.skip(offsets)) : spawn
end
def on(join)
spawn(@relation.on(join))
end
def joins(join, join_type = nil)
return spawn if join.blank?
join_relation = 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
spawn(join_relation).tap { |r| r.readonly = true }
end
def where(*args)
return spawn if args.blank?
builder = PredicateBuilder.new(Arel::Sql::Engine.new(@klass))
conditions = if [String, Array].include?(args.first.class)
merged = @klass.send(:merge_conditions, args.size > 1 ? Array.wrap(args) : args.first)
Arel::SqlLiteral.new(merged) if merged
elsif args.first.is_a?(Hash)
attributes = @klass.send(:expand_hash_conditions_for_aggregates, args.first)
builder.build_from_hash(attributes, table)
else
args.first
end
spawn(@relation.where(*conditions))
end
private
def reverse_sql_order(order_query)
order_query.to_s.split(/,/).each { |s|
if s.match(/\s(asc|ASC)$/)
s.gsub!(/\s(asc|ASC)$/, ' DESC')
elsif s.match(/\s(desc|DESC)$/)
s.gsub!(/\s(desc|DESC)$/, ' ASC')
else
s.concat(' DESC')
end
}.join(',')
end
end
end
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