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
|
module ActiveRecord
class PredicateBuilder # :nodoc:
@handlers = []
autoload :RelationHandler, 'active_record/relation/predicate_builder/relation_handler'
autoload :ArrayHandler, 'active_record/relation/predicate_builder/array_handler'
def initialize(klass, table)
@klass = klass
@table = table
end
def resolve_column_aliases(hash)
hash = hash.dup
hash.keys.grep(Symbol) do |key|
if klass.attribute_alias? key
hash[klass.attribute_alias(key)] = hash.delete key
end
end
hash
end
def build_from_hash(attributes)
attributes = convert_dot_notation_to_hash(attributes.stringify_keys)
expand_from_hash(attributes)
end
def expand(column, value)
queries = []
# 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)
if klass && reflection = klass._reflect_on_association(column)
if reflection.polymorphic? && base_class = polymorphic_base_class_from_value(value)
queries << self.class.build(table[reflection.foreign_type], base_class.name)
end
column = reflection.foreign_key
end
queries << self.class.build(table[column], value)
queries
end
def polymorphic_base_class_from_value(value)
case value
when Relation
value.klass.base_class
when Array
val = value.compact.first
val.class.base_class if val.is_a?(Base)
when Base
value.class.base_class
end
end
def self.references(attributes)
attributes.map do |key, value|
if value.is_a?(Hash)
key
else
key = key.to_s
key.split('.').first if key.include?('.')
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.register_handler(MyCustomDateRange, handler)
def self.register_handler(klass, handler)
@handlers.unshift([klass, handler])
end
register_handler(BasicObject, ->(attribute, value) { attribute.eq(value) })
register_handler(Class, ->(attribute, value) { deprecate_class_handler; attribute.eq(value.name) })
register_handler(Base, ->(attribute, value) { attribute.eq(value.id) })
register_handler(Range, ->(attribute, value) { attribute.between(value) })
register_handler(Relation, RelationHandler.new)
register_handler(Array, ArrayHandler.new)
def self.build(attribute, value)
handler_for(value).call(attribute, value)
end
def self.handler_for(object)
@handlers.detect { |klass, _| klass === object }.last
end
private_class_method :handler_for
def self.deprecate_class_handler
ActiveSupport::Deprecation.warn(<<-MSG.squish)
Passing a class as a value in an Active Record query is deprecated and
will be removed. Pass a string instead.
MSG
end
protected
attr_reader :klass, :table
def expand_from_hash(attributes)
return ["1=0"] if attributes.empty?
attributes.flat_map do |key, value|
if value.is_a?(Hash)
arel_table = Arel::Table.new(key)
association = klass._reflect_on_association(key)
builder = self.class.new(association && association.klass, arel_table)
builder.expand_from_hash(value)
else
expand(key, value)
end
end
end
private
def convert_dot_notation_to_hash(attributes)
dot_notation = attributes.keys.select { |s| s.include?(".") }
dot_notation.each do |key|
table_name, column_name = key.split(".")
value = attributes.delete(key)
attributes[table_name] ||= {}
attributes[table_name] = attributes[table_name].merge(column_name => value)
end
attributes
end
end
end
|