I have a relationship on a model class defined in this way:
create_table :tag do
primary_key :id
index :name
String :name, :unique => true, :null => false
end
class Tag < Sequel::Model
end
create_table :tagged do
primary_key :id
foreign_key :thing_id, :thing, :on_delete => :cascade
foreign_key :tag_id, :tag, :on_delete => :cascade
end
class Tagged < Sequel::Model
end
create_table :thing do
primary_key :id
foreign_key :parent_id, : thing, :on_delete => :set_null
index :name
String :name, :text => true
String :thing_type, :null => false
end
class Thing < Sequel::Model
plugin :rcte_tree
plugin :single_table_inheritance, :thing_type
one_to_many :tagged, :key => :thing_id
many_to_many :tags, :class => 'Tag', :join_table => :tagged, :left_key =>
:thing_id, :right_key => :tag_id
end
My environment looks like this:
$ java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)
$ uname -a
Darwin sol.local 14.0.0 Darwin Kernel Version 14.0.0: Fri Sep 19 00:26:44
PDT 2014; root:xnu-2782.1.97~2/RELEASE_X86_64 x86_64
$ jruby --version
jruby 1.7.16 (1.9.3p392) 2014-09-25 575b395 on Java HotSpot(TM) 64-Bit
Server VM 1.6.0_65-b14-462 +jit [darwin-x86_64]
$ jgem list sequel
*** LOCAL GEMS ***
sequel (4.15.0)
When running in a multi-threaded environment, occasionally, this happens:
o = Thing.new(name: 'test')
o.tags << Tag.new(name: 'alpha')
o.tags << Tag.new(name: 'beta')
10000.times do
# This is dumb, and probably wouldn't actually work, it's just an
illustration
Thread.new do
thing = Thing.find(id: 1)
# Almost always:
some_tags = thing.tags #=> [ #<Tag:0x1c:14>, #<Tag:0x1d:15> ]
# But every once in a while:
some_tags = thing.tags #=> nil
end
end
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