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
|
module ActiveRecord
class TableMetadata # :nodoc:
delegate :foreign_type, :foreign_key, to: :association, prefix: true
def initialize(klass, arel_table, association = nil)
@klass = klass
@arel_table = arel_table
@association = association
end
def type_cast_for_database(attribute_name, value)
return value if value.is_a?(Arel::Nodes::BindParam) || klass.nil?
type = klass.type_for_attribute(attribute_name.to_s)
Arel::Nodes::Quoted.new(type.type_cast_for_database(value))
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 arel_attribute(column_name)
arel_table[column_name]
end
def associated_with?(association_name)
klass && klass._reflect_on_association(association_name)
end
def associated_table(table_name)
return self if table_name == arel_table.name
arel_table = Arel::Table.new(table_name)
association = klass._reflect_on_association(table_name)
if association && !association.polymorphic?
association_klass = association.klass
end
if association
TableMetadata.new(association_klass, arel_table, association)
else
ConnectionAdapterTable.new(klass.connection, arel_table)
end
end
def polymorphic_association?
association && association.polymorphic?
end
protected
attr_reader :klass, :arel_table, :association
end
# FIXME: We want to get rid of this class. The connection adapter does not
# have sufficient knowledge about types, as they could be provided by or
# overriden by the ActiveRecord::Base subclass. The case where you reach this
# class is if you do a query like:
#
# Liquid.joins(molecules: :electrons)
# .where("molecules.name" => "something", "electrons.name" => "something")
#
# Since we don't know that we can get to electrons through molecules
class ConnectionAdapterTable # :nodoc:
def initialize(connection, arel_table)
@connection = connection
@arel_table = arel_table
end
def type_cast_for_database(attribute_name, value)
return value if value.is_a?(Arel::Nodes::BindParam)
type = type_for(attribute_name)
Arel::Nodes::Quoted.new(type.type_cast_for_database(value))
end
def resolve_column_aliases(hash)
hash
end
def arel_attribute(column_name)
arel_table[column_name]
end
def associated_with?(*)
false
end
def associated_table(table_name)
arel_table = Arel::Table.new(table_name)
ConnectionAdapterTable.new(klass.connection, arel_table)
end
def polymorphic_association?
false
end
protected
attr_reader :connection, :arel_table
private
def type_for(attribute_name)
if connection.schema_cache.table_exists?(arel_table.name)
column_for(attribute_name).cast_type
else
Type::Value.new
end
end
def column_for(attribute_name)
connection.schema_cache.columns_hash(arel_table.name)[attribute_name.to_s]
end
end
end
|
