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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
require 'active_record/associations/class_methods/join_dependency/join_part'
require 'active_record/associations/class_methods/join_dependency/join_base'
require 'active_record/associations/class_methods/join_dependency/join_association'
module ActiveRecord
module Associations
module ClassMethods
class JoinDependency # :nodoc:
attr_reader :join_parts, :reflections, :table_aliases, :active_record
def initialize(base, associations, joins)
@active_record = base
@table_joins = joins
@join_parts = [JoinBase.new(base)]
@associations = {}
@reflections = []
@table_aliases = Hash.new(0)
@table_aliases[base.table_name] = 1
build(associations)
end
def graft(*associations)
associations.each do |association|
join_associations.detect {|a| association == a} ||
build(association.reflection.name, association.find_parent_in(self) || join_base, association.join_type)
end
self
end
def join_associations
join_parts.last(join_parts.length - 1)
end
def join_base
join_parts.first
end
def columns
join_parts.collect { |join_part|
table = join_part.aliased_table
join_part.column_names_with_alias.collect{ |column_name, aliased_name|
table[column_name].as Arel.sql(aliased_name)
}
}.flatten
end
def count_aliases_from_table_joins(name)
return 0 unless @table_joins
# quoted_name should be downcased as some database adapters (Oracle) return quoted name in uppercase
quoted_name = active_record.connection.quote_table_name(name.downcase).downcase
join_sql = @table_joins.downcase
# Table names
join_sql.scan(/join(?:\s+\w+)?\s+#{quoted_name}\son/).size +
# Table aliases
join_sql.scan(/join(?:\s+\w+)?\s+\S+\s+#{quoted_name}\son/).size
end
def instantiate(rows)
primary_key = join_base.aliased_primary_key
parents = {}
records = rows.map { |model|
primary_id = model[primary_key]
parent = parents[primary_id] ||= join_base.instantiate(model)
construct(parent, @associations, join_associations, model)
parent
}.uniq
remove_duplicate_results!(active_record, records, @associations)
records
end
def remove_duplicate_results!(base, records, associations)
case associations
when Symbol, String
reflection = base.reflections[associations]
remove_uniq_by_reflection(reflection, records)
when Array
associations.each do |association|
remove_duplicate_results!(base, records, association)
end
when Hash
associations.keys.each do |name|
reflection = base.reflections[name]
remove_uniq_by_reflection(reflection, records)
parent_records = []
records.each do |record|
if descendant = record.send(reflection.name)
if reflection.collection?
parent_records.concat descendant.target.uniq
else
parent_records << descendant
end
end
end
remove_duplicate_results!(reflection.klass, parent_records, associations[name]) unless parent_records.empty?
end
end
end
protected
def cache_joined_association(association)
associations = []
parent = association.parent
while parent != join_base
associations.unshift(parent.reflection.name)
parent = parent.parent
end
ref = @associations
associations.each do |key|
ref = ref[key]
end
ref[association.reflection.name] ||= {}
end
def build(associations, parent = nil, join_type = Arel::InnerJoin)
parent ||= join_parts.last
case associations
when Symbol, String
reflection = parent.reflections[associations.to_s.intern] or
raise ConfigurationError, "Association named '#{ associations }' was not found; perhaps you misspelled it?"
unless join_association = find_join_association(reflection, parent)
@reflections << reflection
join_association = build_join_association(reflection, parent)
join_association.join_type = join_type
@join_parts << join_association
cache_joined_association(join_association)
end
join_association
when Array
associations.each do |association|
build(association, parent, join_type)
end
when Hash
associations.keys.sort{|a,b|a.to_s<=>b.to_s}.each do |name|
join_association = build(name, parent, join_type)
build(associations[name], join_association, join_type)
end
else
raise ConfigurationError, associations.inspect
end
end
def find_join_association(name_or_reflection, parent)
if String === name_or_reflection
name_or_reflection = name_or_reflection.to_sym
end
join_associations.detect { |j|
j.reflection == name_or_reflection && j.parent == parent
}
end
def remove_uniq_by_reflection(reflection, records)
if reflection && reflection.collection?
records.each { |record| record.send(reflection.name).target.uniq! }
end
end
def build_join_association(reflection, parent)
JoinAssociation.new(reflection, self, parent)
end
def construct(parent, associations, join_parts, row)
case associations
when Symbol, String
name = associations.to_s
join_part = join_parts.detect { |j|
j.reflection.name.to_s == name &&
j.parent_table_name == parent.class.table_name }
raise(ConfigurationError, "No such association") unless join_part
join_parts.delete(join_part)
construct_association(parent, join_part, row)
when Array
associations.each do |association|
construct(parent, association, join_parts, row)
end
when Hash
associations.sort_by { |k,_| k.to_s }.each do |name, assoc|
association = construct(parent, name, join_parts, row)
construct(association, assoc, join_parts, row) if association
end
else
raise ConfigurationError, associations.inspect
end
end
def construct_association(record, join_part, row)
return if record.id.to_s != join_part.parent.record_id(row).to_s
macro = join_part.reflection.macro
if macro == :has_one
return if record.instance_variable_defined?("@#{join_part.reflection.name}")
association = join_part.instantiate(row) unless row[join_part.aliased_primary_key].nil?
set_target_and_inverse(join_part, association, record)
else
return if row[join_part.aliased_primary_key].nil?
association = join_part.instantiate(row)
case macro
when :has_many, :has_and_belongs_to_many
collection = record.send(join_part.reflection.name)
collection.loaded
collection.target.push(association)
collection.__send__(:set_inverse_instance, association, record)
when :belongs_to
set_target_and_inverse(join_part, association, record)
else
raise ConfigurationError, "unknown macro: #{join_part.reflection.macro}"
end
end
association
end
def set_target_and_inverse(join_part, association, record)
association_proxy = record.send("set_#{join_part.reflection.name}_target", association)
association_proxy.__send__(:set_inverse_instance, association, record)
end
end
end
end
end
|