14F7u4Vb

1require "rubygems"
2require "dm-core"
3require "dm-validations"
4require "dm-is-remixable"
5
6DataMapper::Logger.new(STDOUT, :debug)
7DataMapper.setup(:default, "sqlite3::memory:")
8
9module Metadata
10  include DataMapper::Resource
11  
12  property :id,            Serial
13  
14  is :remixable
15end
16
17class Stamp
18  include DataMapper::Resource
19  
20  property :id,       Serial
21  
22  remix n, :metadata
23  
24  enhance :metadata do
25    belongs_to :datatype
26  end  
27end
28
29class Content
30  include DataMapper::Resource
31  
32  property :id,             Serial
33
34  remix n,    :metadata
35  
36  enhance :metadata do
37    belongs_to :datatype
38  end
39end
40
41class Datatype
42  include DataMapper::Resource
43  
44  property :id,            Serial
45  property :name,          String
46  
47  has n, :content_metadata, "ContentMetadata"
48  has n, :stamp_metadata, "StampMetadata"
49end
50
51puts DataMapper.auto_migrate!.inspect
52
53Datatype.create :name => 'foo'
54
55
56# mungo:snippets snusnu$ ruby narretgrez.rb 
57#  ~ Generating Remixed Model: StampMetadata
58#  ~ Generating Remixed Model: ContentMetadata
59#  ~ Skipping auto_migrate_down! for remixable module (Metadata)
60#  ~ (0.000135) SELECT sqlite_version(*)
61#  ~ (0.000096) DROP TABLE IF EXISTS "stamps"
62#  ~ (0.000019) DROP TABLE IF EXISTS "stamp_metadatum"
63#  ~ (0.000016) DROP TABLE IF EXISTS "contents"
64#  ~ (0.000048) DROP TABLE IF EXISTS "content_metadatum"
65#  ~ (0.000016) DROP TABLE IF EXISTS "datatypes"
66#  ~ Skipping auto_migrate_up! for remixable module (Metadata)
67#  ~ (0.000024) PRAGMA table_info("stamps")
68#  ~ (0.000361) CREATE TABLE "stamps" ("id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT)
69#  ~ (0.000010) PRAGMA table_info("stamp_metadatum")
70#  ~ (0.000116) CREATE TABLE "stamp_metadatum" ("id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "stamp_id" INTEGER NOT NULL, "datatype_id" INTEGER NOT NULL)
71#  ~ (0.000118) CREATE INDEX "index_stamp_metadatum_datatype" ON "stamp_metadatum" ("datatype_id")
72#  ~ (0.000009) PRAGMA table_info("contents")
73#  ~ (0.000105) CREATE TABLE "contents" ("id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT)
74#  ~ (0.000009) PRAGMA table_info("content_metadatum")
75#  ~ (0.000117) CREATE TABLE "content_metadatum" ("id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "content_id" INTEGER NOT NULL, "datatype_id" INTEGER NOT NULL)
76#  ~ (0.000111) CREATE INDEX "index_content_metadatum_datatype" ON "content_metadatum" ("datatype_id")
77#  ~ (0.000008) PRAGMA table_info("datatypes")
78#  ~ (0.000123) CREATE TABLE "datatypes" ("id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "name" VARCHAR(50))
79# #<DataMapper::Model::DescendantSet:0x32bae0 @descendants=[Metadata, Stamp, StampMetadata, Content, ContentMetadata, Datatype], @ancestors=nil>
80#  ~ (0.000036) INSERT INTO "datatypes" ("name") VALUES ('foo')