zeppelin/backend/src/migrations/1550409894008-FixEmojiIndexInReactionRoles.ts

import { MigrationInterface, QueryRunner } from "typeorm";

export class FixEmojiIndexInReactionRoles1550409894008 implements MigrationInterface {
  public async up(queryRunner: QueryRunner): Promise<any> {
    // In utf8mb4_swedish_ci, different native emojis are counted as the same char for indexes, which means we can't
    // have multiple native emojis on a single message since the emoji field is part of the primary key
    await queryRunner.query(`
        ALTER TABLE \`reaction_roles\`
	        CHANGE COLUMN \`emoji\` \`emoji\` VARCHAR(64) NOT NULL COLLATE 'utf8mb4_bin' AFTER \`message_id\`
      `);
  }

  public async down(queryRunner: QueryRunner): Promise<any> {
    await queryRunner.query(`
        ALTER TABLE \`reaction_roles\`
	        CHANGE COLUMN \`emoji\` \`emoji\` VARCHAR(64) NOT NULL AFTER \`message_id\`
      `);
  }
}