consolidate memes to one table

2 files changed, 60 insertions, 0 deletions

diff --git a/migrations/2018-04-06-005800_consolidate_memes/down.sql b/migrations/2018-04-06-005800_consolidate_memes/down.sql
new file mode 100644
index 0000000..339bf8f
--- /dev/null
+++ b/migrations/2018-04-06-005800_consolidate_memes/down.sql
@@ -0,0 +1,41 @@
+DROP INDEX memes_audio;
+DROP INDEX memes_content;
+DROP INDEX memes_image;
+
+ALTER TABLE memes RENAME TO text_memes;
+
+CREATE TABLE image_memes (
+    id          SERIAL PRIMARY KEY,
+    title       varchar UNIQUE NOT NULL,
+    image_id    INTEGER REFERENCES images NOT NULL,
+
+    metadata_id INTEGER REFERENCES metadata UNIQUE NOT NULL,
+    UNIQUE(title, image_id)
+);
+
+
+CREATE TABLE audio_memes (
+    id          SERIAL PRIMARY KEY,
+    title       varchar UNIQUE NOT NULL,
+    audio_id    INTEGER REFERENCES audio NOT NULL,
+
+    metadata_id INTEGER REFERENCES metadata UNIQUE NOT NULL,
+    UNIQUE(title, audio_id)
+);
+
+
+INSERT INTO audio_memes(title, audio_id, metadata_id) SELECT title, audio_id, metadata_id FROM text_memes
+    WHERE audio_id IS NOT NULL AND content IS NULL;
+
+DELETE FROM text_memes WHERE audio_id IS NOT NULL AND content IS NULL;
+
+
+INSERT INTO image_memes(title, image_id, metadata_id) SELECT title, image_id, metadata_id FROM text_memes
+    WHERE image_id IS NOT NULL AND content IS NULL;
+
+DELETE FROM text_memes WHERE image_id IS NOT NULL AND content IS NULL;
+
+
+ALTER TABLE text_memes ALTER COLUMN content SET NOT NULL;
+ALTER TABLE text_memes DROP CONSTRAINT text_memes_image_or_audio_null;
+ALTER TABLE text_memes DROP CONSTRAINT text_memes_content_not_all_null;
diff --git a/migrations/2018-04-06-005800_consolidate_memes/up.sql b/migrations/2018-04-06-005800_consolidate_memes/up.sql
new file mode 100644
index 0000000..084525b
--- /dev/null
+++ b/migrations/2018-04-06-005800_consolidate_memes/up.sql
@@ -0,0 +1,19 @@
+ALTER TABLE text_memes ADD CONSTRAINT text_memes_content_not_all_null
+    CHECK (content IS NOT NULL OR image_id IS NOT NULL OR audio_id IS NOT NULL);
+
+ALTER TABLE text_memes ADD CONSTRAINT text_memes_image_or_audio_null
+    CHECK (image_id IS NULL OR audio_id IS NULL);
+
+ALTER TABLE text_memes ALTER COLUMN content DROP NOT NULL;
+
+INSERT INTO text_memes(audio_id, metadata_id, title) SELECT audio_id, metadata_id, title FROM audio_memes;
+INSERT INTO text_memes(image_id, metadata_id, title) SELECT image_id, metadata_id, title FROM image_memes;
+
+DROP TABLE audio_memes;
+DROP TABLE image_memes;
+
+ALTER TABLE text_memes RENAME TO memes;
+
+CREATE INDEX memes_audio    ON memes (audio_id);
+CREATE INDEX memes_image    ON memes (image_id);
+CREATE INDEX memes_content  ON memes (content);