authors et recipients tables dans Knex

db/migrations/20190202114345_create_announcements_authors.js

+
+exports.up = function (knex, Promise) {
+    return knex.schema.createTable('announcements_authors', function (table) {
+        table.increments('id'); //autoincrementing (non-nullable) primary key
+
+        table.integer('mid').notNullable()
+            .references('mid').inTable('messages_announcements')
+            .onDelete('CASCADE'); //if announcement is deleted, also delete authors
+
+        table.integer('gid').notNullable()
+            .references('gid').inTable('groups')
+            .onDelete('CASCADE'); //if group is deleted, also delete authors
+    });
+};
+
+exports.down = function (knex, Promise) {
+    return knex.schema.dropTable('announcements_authors');
+};

db/migrations/20190202114346_create_announcements_recipients.js

+
+exports.up = function (knex, Promise) {
+    return knex.schema.createTable('announcements_recipients', function (table) {
+        table.increments('id'); //autoincrementing (non-nullable) primary key
+
+        table.integer('mid').notNullable()
+            .references('mid').inTable('messages_announcements')
+            .onDelete('CASCADE'); //if announcement is deleted, also delete recipients
+
+        table.integer('gid').notNullable()
+            .references('gid').inTable('groups')
+            .onDelete('CASCADE'); //if group is deleted, also delete recipient
+    });
+};
+
+exports.down = function (knex, Promise) {
+    return knex.schema.dropTable('announcements_recipients');
+};

db/migrations/20190202114347_create_events_authors.js

+
+exports.up = function (knex, Promise) {
+    return knex.schema.createTable('events_authors', function (table) {
+        table.increments('id'); //autoincrementing (non-nullable) primary key
+
+        table.integer('mid').notNullable()
+            .references('mid').inTable('messages_events')
+            .onDelete('CASCADE'); //if event is deleted, also delete authors
+
+        table.integer('gid').notNullable()
+            .references('gid').inTable('groups')
+            .onDelete('CASCADE'); //if group is deleted, also delete authors
+    });
+};
+
+exports.down = function (knex, Promise) {
+    return knex.schema.dropTable('events_authors');
+};

db/migrations/20190202114348_create_events_recipients.js

+
+exports.up = function (knex, Promise) {
+    return knex.schema.createTable('events_recipients', function (table) {
+        table.increments('id'); //autoincrementing (non-nullable) primary key
+
+        table.integer('mid').notNullable()
+            .references('mid').inTable('messages_events')
+            .onDelete('CASCADE'); //if event is deleted, also delete recipients
+
+        table.integer('gid').notNullable()
+            .references('gid').inTable('groups')
+            .onDelete('CASCADE'); //if group is deleted, also delete recipient
+    });
+};
+
+exports.down = function (knex, Promise) {
+    return knex.schema.dropTable('events_recipients');
+};