Update seeds to create post with a category

backend/src/seed/seed-db.js

@@ -276,131 +276,82 @@ import Factory from './factories'
       asAdmin.create('Post', {
         id: 'p0',
         image: faker.image.unsplash.food(),
+        categoryIds: ['cat16'],
       }),
       asModerator.create('Post', {
         id: 'p1',
         image: faker.image.unsplash.technology(),
+        categoryIds: ['cat1'],
       }),
       asUser.create('Post', {
         id: 'p2',
         title: `Nature Philosophy Yoga`,
         content: `${hashtag1}`,
+        categoryIds: ['cat2'],
       }),
       asTick.create('Post', {
         id: 'p3',
+        categoryIds: ['cat3'],
       }),
       asTrick.create('Post', {
         id: 'p4',
+        categoryIds: ['cat4'],
       }),
       asTrack.create('Post', {
         id: 'p5',
+        categoryIds: ['cat5'],
       }),
       asAdmin.create('Post', {
         id: 'p6',
         image: faker.image.unsplash.buildings(),
+        categoryIds: ['cat6'],
       }),
       asModerator.create('Post', {
         id: 'p7',
         content: `${mention1} ${faker.lorem.paragraph()}`,
+        categoryIds: ['cat7'],
       }),
       asUser.create('Post', {
         id: 'p8',
         image: faker.image.unsplash.nature(),
         title: `Quantum Flow Theory explains Quantum Gravity`,
         content: `${hashtagAndMention1}`,
+        categoryIds: ['cat8'],
       }),
       asTick.create('Post', {
         id: 'p9',
+        categoryIds: ['cat9'],
       }),
       asTrick.create('Post', {
         id: 'p10',
+        categoryIds: ['cat10'],
       }),
       asTrack.create('Post', {
         id: 'p11',
         image: faker.image.unsplash.people(),
+        categoryIds: ['cat11'],
       }),
       asAdmin.create('Post', {
         id: 'p12',
         content: `${mention2} ${faker.lorem.paragraph()}`,
+        categoryIds: ['cat12'],
       }),
       asModerator.create('Post', {
         id: 'p13',
+        categoryIds: ['cat13'],
       }),
       asUser.create('Post', {
         id: 'p14',
         image: faker.image.unsplash.objects(),
+        categoryIds: ['cat14'],
       }),
       asTick.create('Post', {
         id: 'p15',
+        categoryIds: ['cat15'],
       }),
     ])
 
     await Promise.all([
-      f.relate('Post', 'Categories', {
-        from: 'p0',
-        to: 'cat16',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p1',
-        to: 'cat1',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p2',
-        to: 'cat2',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p3',
-        to: 'cat3',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p4',
-        to: 'cat4',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p5',
-        to: 'cat5',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p6',
-        to: 'cat6',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p7',
-        to: 'cat7',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p8',
-        to: 'cat8',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p9',
-        to: 'cat9',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p10',
-        to: 'cat10',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p11',
-        to: 'cat11',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p12',
-        to: 'cat12',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p13',
-        to: 'cat13',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p14',
-        to: 'cat14',
-      }),
-      f.relate('Post', 'Categories', {
-        from: 'p15',
-        to: 'cat15',
-      }),
-
       f.relate('Post', 'Tags', {
         from: 'p0',
         to: 'Freiheit',