Addded a migration to not have cards anymore (#302)

* addded a migration to not have cards anymore

* tested different order

server/backend/migration/20240102000000.go

@@ -0,0 +1,163 @@
+package migration
+
+import (
+	"github.com/go-gormigrate/gormigrate/v2"
+	"gorm.io/gorm"
+)
+
+// migrate20240102000000
+// removes the option to create learning cards from the db as it has been removed from the api a long time ago
+func migrate20240102000000() *gormigrate.Migration {
+	return &gormigrate.Migration{
+		ID: "20240102000000",
+		Migrate: func(tx *gorm.DB) error {
+			//history+comments
+			if err := tx.Exec("DROP table members_card").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("DROP table members_card_answer_history").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("DROP table card_box").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("DROP table card_comment").Error; err != nil {
+				return err
+			}
+			// tags
+			if err := tx.Exec("DROP table card2tag").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("DROP table tag").Error; err != nil {
+				return err
+			}
+			//cards
+			if err := tx.Exec("DROP table card_option").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("DROP table card").Error; err != nil {
+				return err
+			}
+			// things that dangle of card
+			if err := tx.Exec("DROP table lecture").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("DROP table card_type").Error; err != nil {
+				return err
+			}
+			return nil
+		},
+		Rollback: func(tx *gorm.DB) error {
+			if err := tx.Exec(`create table if not exists card_type(
+				card_type int auto_increment primary key,
+				title     varchar(255) null
+) auto_increment = 2;`).Error; err != nil {
+				return err
+			}
+			if err := tx.Exec(`create table if not exists lecture(
+				lecture int auto_increment primary key,
+				title   varchar(255) null
+			);`).Error; err != nil {
+				return err
+			}
+			// cards
+			if err := tx.Exec(`create table if not exists card(
+				card           int auto_increment primary key,
+				member         int                  null,
+				lecture        int                  null,
+				card_type      int                  null,
+				title          varchar(255)         null,
+				front_text     varchar(2000)        null,
+				front_image    varchar(2000)        null,
+				back_text      varchar(2000)        null,
+				back_image     varchar(2000)        null,
+				can_shift      tinyint(1) default 0 null,
+				created_at     date                 not null,
+				updated_at     date                 not null,
+				duplicate_card int                  null,
+				aggr_rating    float      default 0 null,
+				constraint card_ibfk_1 foreign key (member) references member (member) on delete set null,
+				constraint card_ibfk_2 foreign key (lecture) references lecture (lecture) on delete set null,
+				constraint card_ibfk_3 foreign key (card_type) references card_type (card_type) on delete set null,
+				constraint card_ibfk_4 foreign key (duplicate_card) references card (card) on delete set null
+			);`).Error; err != nil {
+				return err
+			}
+			if err := tx.Exec(`create table if not exists card_option(
+				card_option       int auto_increment primary key,
+				card              int                      not null,
+				text              varchar(2000) default '' null,
+				is_correct_answer tinyint(1)    default 0  null,
+				sort_order        int           default 0  not null,
+				image             varchar(2000)            null,
+				constraint card_option_ibfk_1 foreign key (card) references card (card) on delete cascade
+);`).Error; err != nil {
+				return err
+			}
+			// tags
+			if err := tx.Exec(`create table if not exists tag(
+				tag   int auto_increment primary key,
+				title varchar(255) null
+);`).Error; err != nil {
+				return err
+			}
+			if err := tx.Exec(`create table if not exists card2tag(
+				tag  int not null,
+				card int not null,
+				primary key (tag, card),
+				constraint card2tag_ibfk_1 foreign key (tag) references tag (tag) on delete cascade,
+				constraint card2tag_ibfk_2 foreign key (card) references card (card) on delete cascade
+);`).Error; err != nil {
+				return err
+			}
+			//comments + history
+			if err := tx.Exec(`create table if not exists card_comment(
+				card_comment int auto_increment primary key,
+				member       int           null,
+				card         int           not null,
+				rating       int default 0 null,
+				created_at   date          not null,
+				constraint card_comment_ibfk_1 foreign key (member) references member (member) on delete set null,
+				constraint card_comment_ibfk_2 foreign key (card) references card (card) on delete cascade
+		);`).Error; err != nil {
+				return err
+			}
+			if err := tx.Exec(`create table if not exists card_box(
+				card_box int auto_increment primary key,
+				member   int          null,
+				title    varchar(255) null,
+				duration int          not null,
+				constraint card_box_ibfk_1 foreign key (member) references member (member) on delete cascade
+			) auto_increment = 6;`).Error; err != nil {
+				return err
+			}
+			if err := tx.Exec(`create table if not exists members_card(
+				member                   int not null,
+				card                     int not null,
+				card_box                 int null,
+				last_answered_active_day int null,
+				primary key (member, card),
+				constraint members_card_ibfk_1 foreign key (member) references member (member) on delete cascade,
+				constraint members_card_ibfk_2 foreign key (card) references card (card) on delete cascade,
+				constraint members_card_ibfk_3 foreign key (card_box) references card_box (card_box) on delete set null
+			);`).Error; err != nil {
+				return err
+			}
+			if err := tx.Exec(`create table if not exists members_card_answer_history(
+				members_card_answer_history int auto_increment primary key,
+				member                      int                       not null,
+				card                        int                       null,
+				card_box                    int                       null,
+				answer                      varchar(2000)             null,
+				answer_score                float(10, 2) default 0.00 null,
+				created_at                  date                      not null,
+				constraint members_card_answer_history_ibfk_1 foreign key (member) references member (member) on delete cascade,
+				constraint members_card_answer_history_ibfk_2 foreign key (card) references card (card) on delete set null,
+				constraint members_card_answer_history_ibfk_3 foreign key (card_box) references card_box (card_box) on delete set null
+		);`).Error; err != nil {
+				return err
+			}
+			return nil
+		},
+	}
+}

server/backend/migration/migration.go

@@ -80,6 +80,7 @@ func manualMigrate(db *gorm.DB) error {
 		migrate20230826000000(),
 		migrate20231003000000(),
 		migrate20231023000000(),
+		migrate20240102000000(),
 	}
 	return gormigrate.New(db, gormigrateOptions, migrations).Migrate()
 }