|
| 1 | +class UnavailableIDs < MG::Base |
| 2 | + def up : String |
| 3 | + <<-SQL |
| 4 | + -- add unavailable column to ids |
| 5 | + ALTER TABLE ids ADD COLUMN unavailable INTEGER NOT NULL DEFAULT 0; |
| 6 | +
|
| 7 | + -- add unavailable column to titles |
| 8 | + ALTER TABLE titles ADD COLUMN unavailable INTEGER NOT NULL DEFAULT 0; |
| 9 | + SQL |
| 10 | + end |
| 11 | + |
| 12 | + def down : String |
| 13 | + <<-SQL |
| 14 | + -- remove unavailable column from ids |
| 15 | + ALTER TABLE ids RENAME TO tmp; |
| 16 | +
|
| 17 | + CREATE TABLE ids ( |
| 18 | + path TEXT NOT NULL, |
| 19 | + id TEXT NOT NULL, |
| 20 | + signature TEXT |
| 21 | + ); |
| 22 | +
|
| 23 | + INSERT INTO ids |
| 24 | + SELECT path, id, signature |
| 25 | + FROM tmp; |
| 26 | +
|
| 27 | + DROP TABLE tmp; |
| 28 | +
|
| 29 | + -- recreate the indices |
| 30 | + CREATE UNIQUE INDEX path_idx ON ids (path); |
| 31 | + CREATE UNIQUE INDEX id_idx ON ids (id); |
| 32 | +
|
| 33 | + -- recreate the foreign key constraint on thumbnails |
| 34 | + ALTER TABLE thumbnails RENAME TO tmp; |
| 35 | +
|
| 36 | + CREATE TABLE thumbnails ( |
| 37 | + id TEXT NOT NULL, |
| 38 | + data BLOB NOT NULL, |
| 39 | + filename TEXT NOT NULL, |
| 40 | + mime TEXT NOT NULL, |
| 41 | + size INTEGER NOT NULL, |
| 42 | + FOREIGN KEY (id) REFERENCES ids (id) |
| 43 | + ON UPDATE CASCADE |
| 44 | + ON DELETE CASCADE |
| 45 | + ); |
| 46 | +
|
| 47 | + INSERT INTO thumbnails |
| 48 | + SELECT * FROM tmp; |
| 49 | +
|
| 50 | + DROP TABLE tmp; |
| 51 | +
|
| 52 | + CREATE UNIQUE INDEX tn_index ON thumbnails (id); |
| 53 | +
|
| 54 | + -- remove unavailable column from titles |
| 55 | + ALTER TABLE titles RENAME TO tmp; |
| 56 | +
|
| 57 | + CREATE TABLE titles ( |
| 58 | + id TEXT NOT NULL, |
| 59 | + path TEXT NOT NULL, |
| 60 | + signature TEXT |
| 61 | + ); |
| 62 | +
|
| 63 | + INSERT INTO titles |
| 64 | + SELECT path, id, signature |
| 65 | + FROM tmp; |
| 66 | +
|
| 67 | + DROP TABLE tmp; |
| 68 | +
|
| 69 | + -- recreate the indices |
| 70 | + CREATE UNIQUE INDEX titles_id_idx on titles (id); |
| 71 | + CREATE UNIQUE INDEX titles_path_idx on titles (path); |
| 72 | +
|
| 73 | + -- recreate the foreign key constraint on tags |
| 74 | + ALTER TABLE tags RENAME TO tmp; |
| 75 | +
|
| 76 | + CREATE TABLE tags ( |
| 77 | + id TEXT NOT NULL, |
| 78 | + tag TEXT NOT NULL, |
| 79 | + UNIQUE (id, tag), |
| 80 | + FOREIGN KEY (id) REFERENCES titles (id) |
| 81 | + ON UPDATE CASCADE |
| 82 | + ON DELETE CASCADE |
| 83 | + ); |
| 84 | +
|
| 85 | + INSERT INTO tags |
| 86 | + SELECT * FROM tmp; |
| 87 | +
|
| 88 | + DROP TABLE tmp; |
| 89 | +
|
| 90 | + CREATE INDEX tags_id_idx ON tags (id); |
| 91 | + CREATE INDEX tags_tag_idx ON tags (tag); |
| 92 | + SQL |
| 93 | + end |
| 94 | +end |
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