1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
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/polymorphic_array_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)
register_handler(Class, ClassHandler.new(self))
register_handler(Base, BaseHandler.new(self))
register_handler(Range, RangeHandler.new)
register_handler(RangeHandler::RangeWithBinds, RangeHandler.new)
register_handler(Relation, RelationHandler.new)
register_handler(Array, ArrayHandler.new(self))
register_handler(AssociationQueryValue, AssociationQueryHandler.new(self))
register_handler(PolymorphicArrayValue, PolymorphicArrayHandler.new(self))
end
def build_from_hash(attributes)
attributes = convert_dot_notation_to_hash(attributes)
expand_from_hash(attributes)
end
def create_binds(attributes)
attributes = convert_dot_notation_to_hash(attributes)
create_binds_for_hash(attributes)
end
def self.references(attributes)
attributes.map do |key, value|
if value.is_a?(Hash)
key
else
key = key.to_s
key.split(".".freeze).first if key.include?(".".freeze)
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.new("users").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
when value.is_a?(Hash)
attrs, bvs = associated_predicate_builder(column_name).create_binds_for_hash(value)
result[column_name] = attrs
binds += bvs
when value.is_a?(Relation)
binds += value.bound_attributes
when value.is_a?(Range) && !table.type(column_name).respond_to?(:subtype)
first = value.begin
last = value.end
unless first.respond_to?(:infinite?) && first.infinite?
binds << build_bind_param(column_name, first)
first = Arel::Nodes::BindParam.new
end
unless last.respond_to?(:infinite?) && last.infinite?
binds << build_bind_param(column_name, last)
last = Arel::Nodes::BindParam.new
end
result[column_name] = RangeHandler::RangeWithBinds.new(first, last, value.exclude_end?)
else
if can_be_bound?(column_name, value)
result[column_name] = Arel::Nodes::BindParam.new
binds << build_bind_param(column_name, value)
end
end
end
[result, binds]
end
private
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)
value = AssociationQueryHandler.value_for(table, column, value) if table.associated_with?(column)
build(table.arel_attribute(column), value)
end
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.select do |k, v|
k.include?(".".freeze) && !v.is_a?(Hash)
end
dot_notation.each_key do |key|
table_name, column_name = key.split(".".freeze)
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)
return if table.associated_with?(column_name)
case value
when Array, Range
table.type(column_name).respond_to?(:subtype)
else
!value.nil? && handler_for(value).is_a?(BasicObjectHandler)
end
end
def build_bind_param(column_name, value)
Relation::QueryAttribute.new(column_name.to_s, value, table.type(column_name))
end
end
end
|
