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module ActiveRecord
module QueryMethods
extend ActiveSupport::Concern
included do
(ActiveRecord::Relation::ASSOCIATION_METHODS + ActiveRecord::Relation::MULTI_VALUE_METHODS).each do |query_method|
attr_accessor :"#{query_method}_values"
class_eval <<-CEVAL
def #{query_method}(*args)
spawn.tap do |new_relation|
new_relation.#{query_method}_values ||= []
value = args.size > 1 ? [args] : Array.wrap(args)
new_relation.#{query_method}_values += value
end
end
CEVAL
end
ActiveRecord::Relation::SINGLE_VALUE_METHODS.each do |query_method|
attr_accessor :"#{query_method}_value"
class_eval <<-CEVAL
def #{query_method}(value = true)
spawn.tap do |new_relation|
new_relation.#{query_method}_value = value
end
end
CEVAL
end
end
def lock(locks = true)
relation = spawn
case locks
when String, TrueClass, NilClass
spawn.tap {|new_relation| new_relation.lock_value = locks || true }
else
spawn.tap {|new_relation| new_relation.lock_value = false }
end
end
def reverse_order
relation = spawn
relation.instance_variable_set(:@orders, nil)
order_clause = arel.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 arel
@arel ||= build_arel
end
def build_arel
arel = table
@joins_values.each do |j|
next if j.blank?
@implicit_readonly = true
case j
when Relation::JoinOperation
arel = arel.join(j.relation, j.join_class).on(j.on)
when Hash, Array, Symbol
if @klass.send(:array_of_strings?, j)
arel = arel.join(j.join(' '))
else
arel = arel.join(@klass.send(:build_association_joins, j))
end
else
arel = arel.join(j)
end
end
@where_values.each do |where|
if conditions = build_where(where)
arel = conditions.is_a?(String) ? arel.where(conditions) : arel.where(*conditions)
end
end
@having_values.each do |where|
if conditions = build_where(where)
arel = conditions.is_a?(String) ? arel.having(conditions) : arel.having(*conditions)
end
end
arel = arel.take(@limit_value) if @limit_value.present?
arel = arel.skip(@offset_value) if @offset_value.present?
@group_values.each do |g|
arel = arel.group(g) if g.present?
end
@order_values.each do |o|
arel = arel.order(o) if o.present?
end
@select_values.each do |s|
@implicit_readonly = false
arel = arel.project(s) if s.present?
end
arel = arel.from(@from_value) if @from_value.present?
case @lock_value
when TrueClass
arel = arel.lock
when String
arel = arel.lock(@lock_value)
end
arel
end
def build_where(*args)
return 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
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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