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module ActiveRecord
class PredicateBuilder
def initialize(engine)
@engine = engine
end
def build_from_hash(attributes, default_table)
predicates = attributes.map do |column, value|
table = default_table
if value.is_a?(Hash)
table = Arel::Table.new(column, :engine => @engine)
build_from_hash(value, table)
else
column = column.to_s
if column.include?('.')
table_name, column = column.split('.', 2)
table = Arel::Table.new(table_name, :engine => @engine)
end
attribute = table[column] || Arel::Attribute.new(table, column.to_sym)
case value
when Array, ActiveRecord::Associations::AssociationCollection, ActiveRecord::NamedScope::Scope
values = value.to_a
values.any? ? attribute.in(values) : attribute.eq(nil)
when Range
# TODO : Arel should handle ranges with excluded end.
if value.exclude_end?
[attribute.gteq(value.begin), attribute.lt(value.end)]
else
attribute.in(value)
end
else
attribute.eq(value)
end
end
end
predicates.flatten
end
end
end
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