Throw error if no categories on post creation

Co-authored-by: mattwr18 <mattwr18@gmail.com>

backend/src/middleware/validation/validationMiddleware.js

@@ -40,9 +40,18 @@ const validateUpdateComment = async (resolve, root, args, context, info) => {
   return resolve(root, args, context, info)
 }
 
+const validateCreatePost = async (resolve, root, args, context, info) => {
+  const { categoryIds } = args
+  if (!Array.isArray(categoryIds) || !categoryIds.length) {
+    throw new UserInputError('You cannot create a post without at least one category')
+  }
+  return resolve(root, args, context, info)
+}
+
 export default {
   Mutation: {
     CreateComment: validateCommentCreation,
     UpdateComment: validateUpdateComment,
+    CreatePost: validateCreatePost,
   },
 }

backend/src/schema/resolvers/posts.js

@@ -110,6 +110,7 @@ export default {
       const { categoryIds } = params
       delete params.categoryIds
       params = await fileUpload(params, { file: 'imageUpload', url: 'image' })
+
       params.id = params.id || uuid()
 
       let createPostCypher = `CREATE (post:Post {params})

backend/src/schema/resolvers/posts.spec.js

@@ -19,20 +19,9 @@ const oldTitle = 'Old title'
 const oldContent = 'Old content'
 const newTitle = 'New title'
 const newContent = 'New content'
-const createPostVariables = { title: postTitle, content: postContent }
+const categoryIds = ['cat9', 'cat4', 'cat15']
-const createPostWithCategoriesMutation = gql`
+let createPostVariables
-  mutation($title: String!, $content: String!, $categoryIds: [ID]) {
+
-    CreatePost(title: $title, content: $content, categoryIds: $categoryIds) {
-      id
-      title
-    }
-  }
-`
-const createPostWithCategoriesVariables = {
-  title: postTitle,
-  content: postContent,
-  categoryIds: ['cat9', 'cat4', 'cat15'],
-}
 const postQueryWithCategories = gql`
   query($id: ID) {
     Post(id: $id) {
@@ -42,11 +31,6 @@ const postQueryWithCategories = gql`
     }
   }
 `
-const createPostWithoutCategoriesVariables = {
-  title: 'This is a post without categories',
-  content: 'I should be able to filter it out',
-  categoryIds: null,
-}
 const postQueryFilteredByCategory = gql`
   query Post($filter: _PostFilter) {
     Post(filter: $filter) {
@@ -58,14 +42,14 @@ const postQueryFilteredByCategory = gql`
     }
   }
 `
-const postCategoriesFilterParam = { categories_some: { id_in: ['cat4'] } }
+const postCategoriesFilterParam = { categories_some: { id_in: categoryIds } }
 const postQueryFilteredByCategoryVariables = {
   filter: postCategoriesFilterParam,
 }
 
 const createPostMutation = gql`
-  mutation($title: String!, $content: String!) {
+  mutation($id: ID, $title: String!, $content: String!, $categoryIds: [ID]) {
-    CreatePost(title: $title, content: $content) {
+    CreatePost(id: $id, title: $title, content: $content, categoryIds: $categoryIds) {
       id
       title
       content
@@ -88,6 +72,29 @@ beforeEach(async () => {
     password: '1234',
   }
   await factory.create('User', userParams)
+  await Promise.all([
+    factory.create('Category', {
+      id: 'cat9',
+      name: 'Democracy & Politics',
+      icon: 'university',
+    }),
+    factory.create('Category', {
+      id: 'cat4',
+      name: 'Environment & Nature',
+      icon: 'tree',
+    }),
+    factory.create('Category', {
+      id: 'cat15',
+      name: 'Consumption & Sustainability',
+      icon: 'shopping-cart',
+    }),
+  ])
+  createPostVariables = {
+    id: 'p3589',
+    title: postTitle,
+    content: postContent,
+    categoryIds,
+  }
 })
 
 afterEach(async () => {
@@ -152,8 +159,13 @@ describe('CreatePost', () => {
     describe('language', () => {
       it('allows a user to set the language of the post', async () => {
         const createPostWithLanguageMutation = gql`
-          mutation($title: String!, $content: String!, $language: String) {
+          mutation($title: String!, $content: String!, $language: String, $categoryIds: [ID]) {
-            CreatePost(title: $title, content: $content, language: $language) {
+            CreatePost(
+              title: $title
+              content: $content
+              language: $language
+              categoryIds: $categoryIds
+            ) {
               language
             }
           }
@@ -162,6 +174,7 @@ describe('CreatePost', () => {
           title: postTitle,
           content: postContent,
           language: 'en',
+          categoryIds,
         }
         const expected = { CreatePost: { language: 'en' } }
         await expect(
@@ -171,7 +184,43 @@ describe('CreatePost', () => {
     })
 
     describe('categories', () => {
-      let postWithCategories
+      it('throws an error if categoryIds is not an array', async () => {
+        createPostVariables.categoryIds = null
+        await expect(client.request(createPostMutation, createPostVariables)).rejects.toThrow(
+          'You cannot create a post without at least one category',
+        )
+      })
+
+      it('requires at least one category for successful creation', async () => {
+        createPostVariables.categoryIds = []
+        await expect(client.request(createPostMutation, createPostVariables)).rejects.toThrow(
+          'You cannot create a post without at least one category',
+        )
+      })
+
+      it('allows a user to filter for posts by category', async () => {
+        await client.request(createPostMutation, createPostVariables)
+        const categoryIdsArray = [{ id: 'cat4' }, { id: 'cat15' }, { id: 'cat9' }]
+        const expected = {
+          Post: [
+            {
+              title: postTitle,
+              id: 'p3589',
+              categories: expect.arrayContaining(categoryIdsArray),
+            },
+          ],
+        }
+        await expect(
+          client.request(postQueryFilteredByCategory, postQueryFilteredByCategoryVariables),
+        ).resolves.toEqual(expected)
+      })
+    })
+  })
+})
+
+describe('UpdatePost', () => {
+  let updatePostMutation
+  let updatePostVariables
   beforeEach(async () => {
     await Promise.all([
       factory.create('Category', {
@@ -189,48 +238,12 @@ describe('CreatePost', () => {
         name: 'Consumption & Sustainability',
         icon: 'shopping-cart',
       }),
+      factory.create('Category', {
+        id: 'cat27',
+        name: 'Animal Protection',
+        icon: 'paw',
+      }),
     ])
-        postWithCategories = await client.request(
-          createPostWithCategoriesMutation,
-          createPostWithCategoriesVariables,
-        )
-      })
-
-      it('allows a user to set the categories of the post', async () => {
-        const expected = [{ id: 'cat9' }, { id: 'cat4' }, { id: 'cat15' }]
-        const postQueryWithCategoriesVariables = {
-          id: postWithCategories.CreatePost.id,
-        }
-
-        await expect(
-          client.request(postQueryWithCategories, postQueryWithCategoriesVariables),
-        ).resolves.toEqual({ Post: [{ categories: expect.arrayContaining(expected) }] })
-      })
-
-      it('allows a user to filter for posts by category', async () => {
-        await client.request(createPostWithCategoriesMutation, createPostWithoutCategoriesVariables)
-        const categoryIds = [{ id: 'cat4' }, { id: 'cat15' }, { id: 'cat9' }]
-        const expected = {
-          Post: [
-            {
-              title: postTitle,
-              id: postWithCategories.CreatePost.id,
-              categories: expect.arrayContaining(categoryIds),
-            },
-          ],
-        }
-        await expect(
-          client.request(postQueryFilteredByCategory, postQueryFilteredByCategoryVariables),
-        ).resolves.toEqual(expected)
-      })
-    })
-  })
-})
-
-describe('UpdatePost', () => {
-  let updatePostMutation
-  let updatePostVariables
-  beforeEach(async () => {
     const asAuthor = Factory()
     await asAuthor.create('User', authorParams)
     await asAuthor.authenticateAs(authorParams)
@@ -238,6 +251,7 @@ describe('UpdatePost', () => {
       id: 'p1',
       title: oldTitle,
       content: oldContent,
+      categoryIds,
     })
     updatePostMutation = gql`
       mutation($id: ID!, $title: String!, $content: String!, $categoryIds: [ID]) {
@@ -294,36 +308,10 @@ describe('UpdatePost', () => {
     })
 
     describe('categories', () => {
-      let postWithCategories
       beforeEach(async () => {
-        await Promise.all([
+        await client.request(createPostMutation, createPostVariables)
-          factory.create('Category', {
-            id: 'cat9',
-            name: 'Democracy & Politics',
-            icon: 'university',
-          }),
-          factory.create('Category', {
-            id: 'cat4',
-            name: 'Environment & Nature',
-            icon: 'tree',
-          }),
-          factory.create('Category', {
-            id: 'cat15',
-            name: 'Consumption & Sustainability',
-            icon: 'shopping-cart',
-          }),
-          factory.create('Category', {
-            id: 'cat27',
-            name: 'Animal Protection',
-            icon: 'paw',
-          }),
-        ])
-        postWithCategories = await client.request(
-          createPostWithCategoriesMutation,
-          createPostWithCategoriesVariables,
-        )
         updatePostVariables = {
-          id: postWithCategories.CreatePost.id,
+          id: 'p3589',
           title: newTitle,
           content: newContent,
           categoryIds: ['cat27'],
@@ -334,7 +322,7 @@ describe('UpdatePost', () => {
         await client.request(updatePostMutation, updatePostVariables)
         const expected = [{ id: 'cat27' }]
         const postQueryWithCategoriesVariables = {
-          id: postWithCategories.CreatePost.id,
+          id: 'p3589',
         }
         await expect(
           client.request(postQueryWithCategories, postQueryWithCategoriesVariables),
@@ -365,6 +353,7 @@ describe('DeletePost', () => {
     await asAuthor.create('Post', {
       id: 'p1',
       content: 'To be deleted',
+      categoryIds,
     })
   })
 

backend/src/seed/factories/posts.js

@@ -16,6 +16,7 @@ export default function(params) {
     image = faker.image.unsplash.imageUrl(),
     visibility = 'public',
     deleted = false,
+    categoryIds,
   } = params
 
   return {
@@ -28,6 +29,7 @@ export default function(params) {
         $image: String
         $visibility: Visibility
         $deleted: Boolean
+        $categoryIds: [ID]
       ) {
         CreatePost(
           id: $id
@@ -37,12 +39,13 @@ export default function(params) {
           image: $image
           visibility: $visibility
           deleted: $deleted
+          categoryIds: $categoryIds
         ) {
           title
           content
         }
       }
     `,
-    variables: { id, slug, title, content, image, visibility, deleted },
+    variables: { id, slug, title, content, image, visibility, deleted, categoryIds },
   }
 }