title: Ctx.db.mutation."updateAccepted" is not a function.. Mutation isn't generated by Prisma
body: <p>I try to make a graphql mutation for updating an item from my existing db. Still I got an error when i try to executing this mutation.</p>
  
  <p>I added the "accepted" to the Item:</p>
  
  <p>I tried to deploy my schema but doesnt effect anything..</p>
  
  <pre><code>type Item {
    id: ID! @id
    title: String!
    image: String
    largeImage: String
    price: Int!
    user: User!
    accepted: String!
  }
  </code></pre>
  
  <p>After this I made the mutation: </p>
  
  <pre><code>type Mutation {
    updateAccepted(id: ID!): Item!
  }
  </code></pre>
  
  <p>Then i wrote the resolver: </p>
  
  <pre><code>async updateAccepted(parent, args, ctx, info) {
      // 1. Check if the person is logged in
      const { userId } = ctx.request;
      if (!userId) {
        throw new Error('You must be signed in');
      }
      // 2. find the item
      const item = await ctx.db.mutation.updateAccepted(
        {
          where: { id: args.id },
          data: {
            accepted: 1
          }
        },
        info
      );
  
      // 3. Return the item
      return item;
    },
  </code></pre>
  
  <p>When I execute this function inside the playground i get this error </p>
  
  <pre><code>{
    "data": null,
    "errors": [
      {
        "message": "ctx.db.mutation.updateAccepted is not a function",
        "locations": [
          {
            "line": 10,
            "column": 3
          }
        ],
        "path": [
          "updateAccepted"
        ]
      }
    ]
  }
  </code></pre>
  
  <p>Kinda clueless atm, please help dev in need :)</p>