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
|
module ActiveRecord
module Associations
class HasAndBelongsToManyAssociation < AssociationCollection #:nodoc:
def initialize(owner, reflection)
super
construct_sql
end
def build(attributes = {})
load_target
build_record(attributes)
end
def create(attributes = {})
create_record(attributes) { |record| insert_record(record) }
end
def create!(attributes = {})
create_record(attributes) { |record| insert_record(record, true) }
end
def find_first
load_target.first
end
def find(*args)
options = args.extract_options!
# If using a custom finder_sql, scan the entire collection.
if @reflection.options[:finder_sql]
expects_array = args.first.kind_of?(Array)
ids = args.flatten.compact.uniq
if ids.size == 1
id = ids.first.to_i
record = load_target.detect { |r| id == r.id }
expects_array ? [record] : record
else
load_target.select { |r| ids.include?(r.id) }
end
else
conditions = "#{@finder_sql}"
if sanitized_conditions = sanitize_sql(options[:conditions])
conditions << " AND (#{sanitized_conditions})"
end
options[:conditions] = conditions
options[:joins] = @join_sql
options[:readonly] = finding_with_ambiguous_select?(options[:select] || @reflection.options[:select])
if options[:order] && @reflection.options[:order]
options[:order] = "#{options[:order]}, #{@reflection.options[:order]}"
elsif @reflection.options[:order]
options[:order] = @reflection.options[:order]
end
merge_options_from_reflection!(options)
options[:select] ||= (@reflection.options[:select] || '*')
# Pass through args exactly as we received them.
args << options
@reflection.klass.find(*args)
end
end
protected
def count_records
load_target.size
end
def insert_record(record, force=true)
if record.new_record?
if force
record.save!
else
return false unless record.save
end
end
if @reflection.options[:insert_sql]
@owner.connection.execute(interpolate_sql(@reflection.options[:insert_sql], record))
else
columns = @owner.connection.columns(@reflection.options[:join_table], "#{@reflection.options[:join_table]} Columns")
attributes = columns.inject({}) do |attrs, column|
case column.name
when @reflection.primary_key_name
attrs[column.name] = @owner.quoted_id
when @reflection.association_foreign_key
attrs[column.name] = record.quoted_id
else
if record.has_attribute?(column.name)
value = @owner.send(:quote_value, record[column.name], column)
attrs[column.name] = value unless value.nil?
end
end
attrs
end
sql =
"INSERT INTO #{@owner.connection.quote_table_name @reflection.options[:join_table]} (#{@owner.send(:quoted_column_names, attributes).join(', ')}) " +
"VALUES (#{attributes.values.join(', ')})"
@owner.connection.execute(sql)
end
return true
end
def delete_records(records)
if sql = @reflection.options[:delete_sql]
records.each { |record| @owner.connection.execute(interpolate_sql(sql, record)) }
else
ids = quoted_record_ids(records)
sql = "DELETE FROM #{@owner.connection.quote_table_name @reflection.options[:join_table]} WHERE #{@reflection.primary_key_name} = #{@owner.quoted_id} AND #{@reflection.association_foreign_key} IN (#{ids})"
@owner.connection.execute(sql)
end
end
def construct_sql
interpolate_sql_options!(@reflection.options, :finder_sql)
if @reflection.options[:finder_sql]
@finder_sql = @reflection.options[:finder_sql]
else
@finder_sql = "#{@owner.connection.quote_table_name @reflection.options[:join_table]}.#{@reflection.primary_key_name} = #{@owner.quoted_id} "
@finder_sql << " AND (#{conditions})" if conditions
end
@join_sql = "INNER JOIN #{@owner.connection.quote_table_name @reflection.options[:join_table]} ON #{@reflection.quoted_table_name}.#{@reflection.klass.primary_key} = #{@owner.connection.quote_table_name @reflection.options[:join_table]}.#{@reflection.association_foreign_key}"
end
def construct_scope
{ :find => { :conditions => @finder_sql,
:joins => @join_sql,
:readonly => false,
:order => @reflection.options[:order],
:limit => @reflection.options[:limit] } }
end
# Join tables with additional columns on top of the two foreign keys must be considered ambiguous unless a select
# clause has been explicitly defined. Otherwise you can get broken records back, if, for example, the join column also has
# an id column. This will then overwrite the id column of the records coming back.
def finding_with_ambiguous_select?(select_clause)
!select_clause && @owner.connection.columns(@reflection.options[:join_table], "Join Table Columns").size != 2
end
private
def create_record(attributes)
# Can't use Base.create because the foreign key may be a protected attribute.
ensure_owner_is_not_new
if attributes.is_a?(Array)
attributes.collect { |attr| create(attr) }
else
record = build(attributes)
yield(record)
record
end
end
end
end
end
|
