1 # Mixin module providing a method to convert filters into a list of SQL
2 # fragments suitable to be fed to ActiveRecord #where.
11 # +filters+ array of conditions, each being [column, operator, operand]
12 # +model_class+ subclass of ActiveRecord being filtered
16 # :cond_out array of SQL fragments for each filter expression
17 # :param_out array of values for parameter substitution in cond_out
18 def record_filters filters, model_class
22 ar_table_name = model_class.table_name
23 filters.each do |filter|
24 attrs_in, operator, operand = filter
26 attrs = model_class.searchable_columns(operator)
27 elsif attrs_in.is_a? Array
32 if !filter.is_a? Array
33 raise ArgumentError.new("Invalid element in filters array: #{filter.inspect} is not an array")
34 elsif !operator.is_a? String
35 raise ArgumentError.new("Invalid operator '#{operator}' (#{operator.class}) in filter")
39 if !model_class.searchable_columns(operator).index attr.to_s
40 raise ArgumentError.new("Invalid attribute '#{attr}' in filter")
42 case operator.downcase
43 when '=', '<', '<=', '>', '>=', '!=', 'like', 'ilike'
44 attr_type = model_class.attribute_column(attr).type
45 operator = '<>' if operator == '!='
46 if operand.is_a? String
47 if attr_type == :boolean
48 if not ['=', '<>'].include?(operator)
49 raise ArgumentError.new("Invalid operator '#{operator}' for " \
50 "boolean attribute '#{attr}'")
53 when '1', 't', 'true', 'y', 'yes'
55 when '0', 'f', 'false', 'n', 'no'
58 raise ArgumentError("Invalid operand '#{operand}' for " \
59 "boolean attribute '#{attr}'")
62 cond_out << "#{ar_table_name}.#{attr} #{operator} ?"
63 if (# any operator that operates on value rather than
65 operator.match(/[<=>]/) and (attr_type == :datetime))
66 operand = Time.parse operand
69 elsif operand.nil? and operator == '='
70 cond_out << "#{ar_table_name}.#{attr} is null"
71 elsif operand.nil? and operator == '<>'
72 cond_out << "#{ar_table_name}.#{attr} is not null"
73 elsif (attr_type == :boolean) and ['=', '<>'].include?(operator) and
74 [true, false].include?(operand)
75 cond_out << "#{ar_table_name}.#{attr} #{operator} ?"
78 raise ArgumentError.new("Invalid operand type '#{operand.class}' "\
79 "for '#{operator}' operator in filters")
82 if operand.is_a? Array
83 cond_out << "#{ar_table_name}.#{attr} #{operator} (?)"
85 if operator == 'not in' and not operand.include?(nil)
86 # explicitly allow NULL
87 cond_out[-1] = "(#{cond_out[-1]} OR #{ar_table_name}.#{attr} IS NULL)"
90 raise ArgumentError.new("Invalid operand type '#{operand.class}' "\
91 "for '#{operator}' operator in filters")
94 operand = [operand] unless operand.is_a? Array
97 cl = ArvadosModel::kind_class op
99 cond << "#{ar_table_name}.#{attr} like ?"
100 param_out << cl.uuid_like_pattern
105 cond_out << cond.join(' OR ')
108 conds_out << cond_out.join(' OR ') if cond_out.any?
111 {:cond_out => conds_out, :param_out => param_out}