feat(migrations): バックエンドでのmigrationの修正に合わせてこっちも修正

Author: hiroyaonoe

.docker/migrations/20210319141439-CreatePosts.sql

@@ -10,7 +10,7 @@ CREATE TABLE IF NOT EXISTS posts (
     source     VARCHAR(2048),
     created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
     updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
-    FOREIGN KEY (user_id) REFERENCES users (id)
+    FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
 );
 -- +migrate Down
 DROP TABLE IF EXISTS posts;

.docker/migrations/20210319143039-CreateComments.sql

@@ -12,8 +12,8 @@ CREATE TABLE IF NOT EXISTS comments (
     created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
     updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
     PRIMARY KEY (id, post_id),
-    FOREIGN KEY (post_id) REFERENCES posts (id),
-    FOREIGN KEY (user_id) REFERENCES users (id)
+    FOREIGN KEY (post_id) REFERENCES posts (id) ON DELETE CASCADE,
+    FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
 );
 -- +migrate Down
 DROP TABLE IF EXISTS comments;