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require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/object/blank'
module ActiveRecord
module QueryMethods
extend ActiveSupport::Concern
attr_accessor :includes_values, :eager_load_values, :preload_values,
:select_values, :group_values, :order_values, :joins_values,
:where_values, :having_values, :bind_values,
:limit_value, :offset_value, :lock_value, :readonly_value, :create_with_value,
:from_value, :reorder_value, :reverse_order_value
def includes(*args)
args.reject! {|a| a.blank? }
return self if args.empty?
relation = clone
relation.includes_values = (relation.includes_values + args).flatten.uniq
relation
end
def eager_load(*args)
return self if args.blank?
relation = clone
relation.eager_load_values += args
relation
end
def preload(*args)
return self if args.blank?
relation = clone
relation.preload_values += args
relation
end
def select(value = Proc.new)
if block_given?
to_a.select {|*block_args| value.call(*block_args) }
else
relation = clone
relation.select_values += Array.wrap(value)
relation
end
end
def group(*args)
return self if args.blank?
relation = clone
relation.group_values += args.flatten
relation
end
def order(*args)
return self if args.blank?
relation = clone
relation.order_values += args.flatten
relation
end
def reorder(*args)
return self if args.blank?
relation = clone
relation.reorder_value = args.flatten
relation
end
def joins(*args)
return self if args.compact.blank?
relation = clone
args.flatten!
relation.joins_values += args
relation
end
def bind(value)
relation = clone
relation.bind_values += [value]
relation
end
def where(opts, *rest)
return self if opts.blank?
relation = clone
relation.where_values += build_where(opts, rest)
relation
end
def having(opts, *rest)
return self if opts.blank?
relation = clone
relation.having_values += build_where(opts, rest)
relation
end
def limit(value)
relation = clone
relation.limit_value = value
relation
end
def offset(value)
relation = clone
relation.offset_value = value
relation
end
def lock(locks = true)
relation = clone
case locks
when String, TrueClass, NilClass
relation.lock_value = locks || true
else
relation.lock_value = false
end
relation
end
def readonly(value = true)
relation = clone
relation.readonly_value = value
relation
end
def create_with(value)
relation = clone
relation.create_with_value = value ? create_with_value.merge(value) : {}
relation
end
def from(value)
relation = clone
relation.from_value = value
relation
end
def extending(*modules)
modules << Module.new(&Proc.new) if block_given?
return self if modules.empty?
relation = clone
relation.send(:apply_modules, modules.flatten)
relation
end
def reverse_order
relation = clone
relation.reverse_order_value = !relation.reverse_order_value
relation
end
def arel
@arel ||= with_default_scope.build_arel
end
def build_arel
arel = table.from table
build_joins(arel, @joins_values) unless @joins_values.empty?
collapse_wheres(arel, (@where_values - ['']).uniq)
arel.having(*@having_values.uniq.reject{|h| h.blank?}) unless @having_values.empty?
arel.take(connection.sanitize_limit(@limit_value)) if @limit_value
arel.skip(@offset_value) if @offset_value
arel.group(*@group_values.uniq.reject{|g| g.blank?}) unless @group_values.empty?
order = @reorder_value ? @reorder_value : @order_values
order = reverse_sql_order(order) if @reverse_order_value
arel.order(*order.uniq.reject{|o| o.blank?}) unless order.empty?
build_select(arel, @select_values.uniq)
arel.from(@from_value) if @from_value
arel.lock(@lock_value) if @lock_value
arel
end
private
def custom_join_ast(table, joins)
joins = joins.reject { |join| join.blank? }
return [] if joins.empty?
@implicit_readonly = true
joins.map do |join|
case join
when Array
join = Arel.sql(join.join(' ')) if array_of_strings?(join)
when String
join = Arel.sql(join)
end
table.create_string_join(join)
end
end
def collapse_wheres(arel, wheres)
equalities = wheres.grep(Arel::Nodes::Equality)
arel.where(Arel::Nodes::And.new(equalities)) unless equalities.empty?
(wheres - equalities).each do |where|
where = Arel.sql(where) if String === where
arel.where(Arel::Nodes::Grouping.new(where))
end
end
def build_where(opts, other = [])
case opts
when String, Array
[@klass.send(:sanitize_sql, other.empty? ? opts : ([opts] + other))]
when Hash
attributes = @klass.send(:expand_hash_conditions_for_aggregates, opts)
PredicateBuilder.build_from_hash(table.engine, attributes, table)
else
[opts]
end
end
def build_joins(manager, joins)
buckets = joins.group_by do |join|
case join
when String
'string_join'
when Hash, Symbol, Array
'association_join'
when ActiveRecord::Associations::JoinDependency::JoinAssociation
'stashed_join'
when Arel::Nodes::Join
'join_node'
else
raise 'unknown class: %s' % join.class.name
end
end
association_joins = buckets['association_join'] || []
stashed_association_joins = buckets['stashed_join'] || []
join_nodes = (buckets['join_node'] || []).uniq
string_joins = (buckets['string_join'] || []).map { |x|
x.strip
}.uniq
join_list = join_nodes + custom_join_ast(manager, string_joins)
join_dependency = ActiveRecord::Associations::JoinDependency.new(
@klass,
association_joins,
join_list
)
join_dependency.graft(*stashed_association_joins)
@implicit_readonly = true unless association_joins.empty? && stashed_association_joins.empty?
# FIXME: refactor this to build an AST
join_dependency.join_associations.each do |association|
association.join_to(manager)
end
manager.join_sources.concat join_list
manager
end
def build_select(arel, selects)
unless selects.empty?
@implicit_readonly = false
arel.project(*selects)
else
arel.project(@klass.arel_table[Arel.star])
end
end
def apply_modules(modules)
unless modules.empty?
@extensions += modules
modules.each {|extension| extend(extension) }
end
end
def reverse_sql_order(order_query)
order_query = ["#{quoted_table_name}.#{quoted_primary_key} ASC"] if order_query.empty?
order_query.map do |o|
case o
when Arel::Nodes::Ascending, Arel::Nodes::Descending
o.reverse
when String, Symbol
o.to_s.split(',').collect do |s|
s.gsub!(/\sasc\Z/i, ' DESC') || s.gsub!(/\sdesc\Z/i, ' ASC') || s.concat(' DESC')
end
else
o
end
end.flatten
end
def array_of_strings?(o)
o.is_a?(Array) && o.all?{|obj| obj.is_a?(String)}
end
end
end
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