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module ActiveRecord
class PredicateBuilder # :nodoc:
def self.build_from_hash(engine, attributes, default_table)
queries = []
attributes.each do |column, value|
table = default_table
if value.is_a?(Hash)
table = Arel::Table.new(column, engine)
value.each do |k,v|
if rk = find_reflection_key(column, v, v)
if rk[:foreign_type]
queries << build(table[rk[:foreign_type]], v.class.base_class)
end
k = rk[:foreign_key]
end
queries << build(table[k.to_sym], v)
end
else
column = column.to_s
if column.include?('.')
table_name, column = column.split('.', 2)
table = Arel::Table.new(table_name, engine)
end
if rk = find_reflection_key(column, engine, value)
if rk[:foreign_type]
queries << build(table[rk[:foreign_type]], value.class.base_class)
end
column = rk[:foreign_key]
end
queries << build(table[column.to_sym], value)
end
end
queries
end
def self.references(attributes)
attributes.map do |key, value|
if value.is_a?(Hash)
key
else
key = key.to_s
key.split('.').first.to_sym if key.include?('.')
end
end.compact
end
# 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)
def self.find_reflection_key(parent_column, model, value)
# value must be an ActiveRecord object
return nil unless value.class < Model::Tag
if reflection = model.reflections[parent_column.to_sym]
if reflection.options[:polymorphic]
{
:foreign_key => reflection.foreign_key,
:foreign_type => reflection.foreign_type
}
else
{ :foreign_key => reflection.foreign_key }
end
end
end
private
def self.build(attribute, value)
case value
when Array, ActiveRecord::Associations::CollectionProxy
values = value.to_a.map {|x| x.is_a?(ActiveRecord::Model) ? x.id : x}
ranges, values = values.partition {|v| v.is_a?(Range)}
values_predicate = if values.include?(nil)
values = values.compact
case values.length
when 0
attribute.eq(nil)
when 1
attribute.eq(values.first).or(attribute.eq(nil))
else
attribute.in(values).or(attribute.eq(nil))
end
else
attribute.in(values)
end
array_predicates = ranges.map { |range| attribute.in(range) }
array_predicates << values_predicate
array_predicates.inject { |composite, predicate| composite.or(predicate) }
when ActiveRecord::Relation
value = value.select(value.klass.arel_table[value.klass.primary_key]) if value.select_values.empty?
attribute.in(value.arel.ast)
when Range
attribute.in(value)
when ActiveRecord::Model
attribute.eq(value.id)
when Class
# FIXME: I think we need to deprecate this behavior
attribute.eq(value.name)
else
attribute.eq(value)
end
end
end
end
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