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module ActiveRecord
class PredicateBuilder # :nodoc:
def self.build_from_hash(engine, attributes, default_table, allow_table_name = true)
predicates = attributes.map do |column, value|
table = default_table
if allow_table_name && value.is_a?(Hash)
table = Arel::Table.new(column, engine)
if value.empty?
'1 = 2'
else
build_from_hash(engine, value, table, false)
end
else
column = column.to_s
if allow_table_name && column.include?('.')
table_name, column = column.split('.', 2)
table = Arel::Table.new(table_name, engine)
end
attribute = table[column.to_sym]
case value
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 Array, ActiveRecord::Associations::CollectionProxy
values = value.to_a.map { |x|
x.is_a?(ActiveRecord::Base) ? x.id : x
}
if values.include?(nil)
values = values.compact
if values.empty?
attribute.eq nil
else
attribute.in(values.compact).or attribute.eq(nil)
end
else
attribute.in(values)
end
when Range, Arel::Relation
attribute.in(value)
when ActiveRecord::Base
attribute.eq(value.id)
when Class
# FIXME: I think we need to deprecate this behavior
attribute.eq(value.name)
when Integer, ActiveSupport::Duration
# Arel treats integers as literals, but they should be quoted when compared with strings
column = engine.connection_pool.columns_hash[table.name][attribute.name.to_s]
attribute.eq(Arel::Nodes::SqlLiteral.new(engine.connection.quote(value, column)))
else
attribute.eq(value)
end
end
end
predicates.flatten
end
end
end
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