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
|
module ActiveRecord
# = Active Record Has And Belongs To Many Association
module Associations
class HasAndBelongsToManyAssociation < AssociationCollection #:nodoc:
def create(attributes = {})
create_record(attributes) { |record| insert_record(record) }
end
def create!(attributes = {})
create_record(attributes) { |record| insert_record(record, true) }
end
def columns
@reflection.columns(@reflection.options[:join_table], "#{@reflection.options[:join_table]} Columns")
end
def reset_column_information
@reflection.reset_column_information
end
def has_primary_key?
@has_primary_key ||= @owner.connection.supports_primary_key? && @owner.connection.primary_key(@reflection.options[:join_table])
end
protected
def construct_find_options!(options)
options[:joins] = Arel::SqlLiteral.new @join_sql
options[:readonly] = finding_with_ambiguous_select?(options[:select] || @reflection.options[:select])
options[:select] ||= (@reflection.options[:select] || Arel::SqlLiteral.new('*'))
end
def count_records
load_target.size
end
def insert_record(record, force = true, validate = true)
if record.new_record?
if force
record.save!
else
return false unless record.save(:validate => validate)
end
end
if @reflection.options[:insert_sql]
@owner.connection.insert(interpolate_sql(@reflection.options[:insert_sql], record))
else
relation = Arel::Table.new(@reflection.options[:join_table])
timestamps = record_timestamp_columns(record)
timezone = record.send(:current_time_from_proper_timezone) if timestamps.any?
attributes = columns.inject({}) do |attrs, column|
name = column.name
case name.to_s
when @reflection.primary_key_name.to_s
attrs[relation[name]] = @owner.id
when @reflection.association_foreign_key.to_s
attrs[relation[name]] = record.id
when *timestamps
attrs[relation[name]] = timezone
else
if record.has_attribute?(name)
value = @owner.send(:quote_value, record[name], column)
attrs[relation[name]] = value unless value.nil?
end
end
attrs
end
relation.insert(attributes)
end
return true
end
def delete_records(records)
if sql = @reflection.options[:delete_sql]
records.each { |record| @owner.connection.delete(interpolate_sql(sql, record)) }
else
relation = Arel::Table.new(@reflection.options[:join_table])
relation.where(relation[@reflection.primary_key_name].eq(@owner.id).
and(relation[@reflection.association_foreign_key].in(records.map { |x| x.id }))
).delete
end
end
def construct_sql
if @reflection.options[:finder_sql]
@finder_sql = interpolate_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}"
construct_counter_sql
end
def construct_scope
{ :find => { :conditions => @finder_sql,
:joins => @join_sql,
:readonly => false,
:order => @reflection.options[:order],
:include => @reflection.options[:include],
: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 && columns.size != 2
end
private
def create_record(attributes, &block)
# 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
build_record(attributes, &block)
end
end
def record_timestamp_columns(record)
if record.record_timestamps
record.send(:all_timestamp_attributes).map { |x| x.to_s }
else
[]
end
end
end
end
end
|