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
|
module ActiveRecord
class Relation
delegate :to_sql, :to => :relation
delegate :length, :collect, :find, :map, :each, :to => :to_a
attr_reader :relation, :klass
def initialize(klass, relation, readonly = false, preload = [], eager_load = [])
@klass, @relation = klass, relation
@readonly = readonly
@associations_to_preload = preload
@eager_load_associations = eager_load
@loaded = false
end
def preload(*associations)
create_new_relation(@relation, @readonly, @associations_to_preload + Array.wrap(associations))
end
def eager_load(*associations)
create_new_relation(@relation, @readonly, @associations_to_preload, @eager_load_associations + Array.wrap(associations))
end
def readonly
create_new_relation(@relation, true)
end
def select(selects)
create_new_relation(@relation.project(selects))
end
def group(groups)
create_new_relation(@relation.group(groups))
end
def order(orders)
create_new_relation(@relation.order(orders))
end
def limit(limits)
create_new_relation(@relation.take(limits))
end
def offset(offsets)
create_new_relation(@relation.skip(offsets))
end
def on(join)
create_new_relation(@relation.on(join))
end
def joins(join, join_type = nil)
join = case join
when String
@relation.join(join)
when Hash, Array, Symbol
if @klass.send(:array_of_strings?, join)
@relation.join(join.join(' '))
else
@relation.join(@klass.send(:build_association_joins, join))
end
else
@relation.join(join, join_type)
end
create_new_relation(join)
end
def where(*args)
if [String, Hash, Array].include?(args.first.class)
conditions = @klass.send(:merge_conditions, args.size > 1 ? Array.wrap(args) : args.first)
else
conditions = args.first
end
create_new_relation(@relation.where(conditions))
end
def respond_to?(method)
@relation.respond_to?(method) || Array.method_defined?(method) || super
end
def to_a
return @records if loaded?
@records = if @eager_load_associations.any?
catch :invalid_query do
return @klass.send(:find_with_associations, {
:select => @relation.send(:select_clauses).join(', '),
:joins => @relation.joins(relation),
:group => @relation.send(:group_clauses).join(', '),
:order => @relation.send(:order_clauses).join(', '),
:conditions => @relation.send(:where_clauses).join("\n\tAND "),
:limit => @relation.taken,
:offset => @relation.skipped
},
ActiveRecord::Associations::ClassMethods::JoinDependency.new(@klass, @eager_load_associations, nil))
end
[]
else
@klass.find_by_sql(@relation.to_sql)
end
@associations_to_preload.each {|associations| @klass.send(:preload_associations, @records, associations) }
@records.each { |record| record.readonly! } if @readonly
@loaded = true
@records
end
alias all to_a
def first
if loaded?
@records.first
else
@first ||= limit(1).to_a[0]
end
end
def loaded?
@loaded
end
def reload
@loaded = false
@records = @first = nil
self
end
private
def method_missing(method, *args, &block)
if @relation.respond_to?(method)
@relation.send(method, *args, &block)
elsif Array.method_defined?(method)
to_a.send(method, *args, &block)
else
super
end
end
def create_new_relation(relation, readonly = @readonly, preload = @associations_to_preload, eager_load = @eager_load_associations)
Relation.new(@klass, relation, readonly, preload, eager_load)
end
end
end
|
