fix(services): allow deletion of channel if there's more than 1 channel

src/services/channels/[channelId]/__test__/delete.test.ts

@@ -8,6 +8,7 @@ describe('DELETE /channels/[channelId]', () => {
   it('succeeds', async () => {
     prismaMock.channel.findUnique.mockResolvedValue(channelExample)
     prismaMock.member.findFirst.mockResolvedValue(memberExample)
+    prismaMock.channel.count.mockResolvedValue(2)
     prismaMock.channel.delete.mockResolvedValue(channelExample)
     const { accessToken } = await authenticateUserTest()
     const response = await application.inject({
@@ -24,6 +25,21 @@ describe('DELETE /channels/[channelId]', () => {
     expect(responseJson.guildId).toEqual(channelExample.guildId)
   })
 
+  it('fails if there is only one channel', async () => {
+    prismaMock.channel.findUnique.mockResolvedValue(channelExample)
+    prismaMock.member.findFirst.mockResolvedValue(memberExample)
+    prismaMock.channel.count.mockResolvedValue(1)
+    const { accessToken } = await authenticateUserTest()
+    const response = await application.inject({
+      method: 'DELETE',
+      url: `/channels/${channelExample.id}`,
+      headers: {
+        authorization: `Bearer ${accessToken}`
+      }
+    })
+    expect(response.statusCode).toEqual(400)
+  })
+
   it('fails if the channel is not found', async () => {
     prismaMock.channel.findUnique.mockResolvedValue(null)
     const { accessToken } = await authenticateUserTest()

src/services/channels/[channelId]/delete.ts

@@ -61,6 +61,14 @@ export const deleteChannelService: FastifyPluginAsync = async (fastify) => {
       if (!member.isOwner) {
         throw fastify.httpErrors.badRequest('You should be a member owner')
       }
+      const channelCount = await prisma.channel.count({
+        where: { guildId: channelCheck.guildId }
+      })
+      if (channelCount <= 1) {
+        throw fastify.httpErrors.badRequest(
+          'The guild should have at least one channel'
+        )
+      }
       const channel = await prisma.channel.delete({
         where: { id: channelId }
       })