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module ActiveRecord
class PredicateBuilder # :nodoc:
require 'active_record/relation/predicate_builder/array_handler'
require 'active_record/relation/predicate_builder/association_query_handler'
require 'active_record/relation/predicate_builder/base_handler'
require 'active_record/relation/predicate_builder/basic_object_handler'
require 'active_record/relation/predicate_builder/class_handler'
require 'active_record/relation/predicate_builder/range_handler'
require 'active_record/relation/predicate_builder/relation_handler'
delegate :resolve_column_aliases, to: :table
def initialize(table)
@table = table
@handlers = []
register_handler(BasicObject, BasicObjectHandler.new(self))
register_handler(Class, ClassHandler.new(self))
register_handler(Base, BaseHandler.new(self))
register_handler(Range, RangeHandler.new(self))
register_handler(Relation, RelationHandler.new)
register_handler(Array, ArrayHandler.new(self))
register_handler(AssociationQueryValue, AssociationQueryHandler.new(self))
end
def build_from_hash(attributes)
attributes = convert_dot_notation_to_hash(attributes.stringify_keys)
expand_from_hash(attributes)
end
def create_binds(attributes)
attributes = convert_dot_notation_to_hash(attributes.stringify_keys)
create_binds_for_hash(attributes)
end
def expand(column, value)
# Find the foreign key when using queries such as:
# Post.where(author: author)
#
# For polymorphic relationships, find the foreign key and type:
# PriceEstimate.where(estimate_of: treasure)
if table.associated_with?(column)
value = AssociationQueryValue.new(table.associated_table(column), value)
end
build(table.arel_attribute(column), value)
end
def self.references(attributes)
attributes.map do |key, value|
if value.is_a?(Hash)
key
else
key = key.to_s
key.split('.').first if key.include?('.')
end
end.compact
end
# Define how a class is converted to Arel nodes when passed to +where+.
# The handler can be any object that responds to +call+, and will be used
# for any value that +===+ the class given. For example:
#
# MyCustomDateRange = Struct.new(:start, :end)
# handler = proc do |column, range|
# Arel::Nodes::Between.new(column,
# Arel::Nodes::And.new([range.start, range.end])
# )
# end
# ActiveRecord::PredicateBuilder.register_handler(MyCustomDateRange, handler)
def register_handler(klass, handler)
@handlers.unshift([klass, handler])
end
def build(attribute, value)
handler_for(value).call(attribute, value)
end
protected
attr_reader :table
def expand_from_hash(attributes)
return ["1=0"] if attributes.empty?
attributes.flat_map do |key, value|
if value.is_a?(Hash)
associated_predicate_builder(key).expand_from_hash(value)
else
expand(key, value)
end
end
end
def create_binds_for_hash(attributes)
result = attributes.dup
binds = []
attributes.each do |column_name, value|
case value
when Hash
attrs, bvs = associated_predicate_builder(column_name).create_binds_for_hash(value)
result[column_name] = attrs
binds += bvs
when Relation
binds += value.bound_attributes
else
if can_be_bound?(column_name, value)
result[column_name] = Arel::Nodes::BindParam.new
binds << Relation::QueryAttribute.new(column_name.to_s, value, table.type(column_name))
end
end
end
[result, binds]
end
private
def associated_predicate_builder(association_name)
self.class.new(table.associated_table(association_name))
end
def convert_dot_notation_to_hash(attributes)
dot_notation = attributes.keys.select { |s| s.include?(".") }
dot_notation.each do |key|
table_name, column_name = key.split(".")
value = attributes.delete(key)
attributes[table_name] ||= {}
attributes[table_name] = attributes[table_name].merge(column_name => value)
end
attributes
end
def handler_for(object)
@handlers.detect { |klass, _| klass === object }.last
end
def can_be_bound?(column_name, value)
!value.nil? &&
handler_for(value).is_a?(BasicObjectHandler) &&
!table.associated_with?(column_name)
end
end
end
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