Resolving GraphQL/ExtractType rubocop offense in mutation type rails

Before we do any refactoring, currently, my project’s mutation root looks like the below in schema:

type Mutation {
  adminCreateCategory(
    input: AdminCreateCategoryInput!
  ): Category

  adminCreateKind(
    input: AdminCreateKindInput!
  ): Kind

  adminCreateVendor(
    input: AdminCreateVendorInput!
  ): Vendor

  adminLogin(
    input: AdminLoginInput!
  ): AdminLoginPayload
}

Also, the mutation_type.rb looks like this:

module Types
  # Path: app/graphql/types/mutation_type.rb
  class MutationType < Types::BaseObject
    description "The mutation root of this schema"

    field :admin_login, mutation: Mutations::AdminLogin, description: "Admin login"

    field :admin_create_category, mutation: Mutations::AdminCreateCategory, description: "Create a new category"

    field :admin_create_kind, mutation: Mutations::AdminCreateKind, description: "Create a new kind"

    field :admin_create_vendor, mutation: Mutations::AdminCreateVendor, description: "Create a new vendor"
  end
end 

My rubocop says:

Consider moving admin_login, admin_create_category, admin_create_kind, admin_create_vendor to a new type and adding the `admin` field instead (convention:GraphQL/ExtractType)

To resolve this offense, we will move to a separate common field, admin, in the mutation type.

Solution:

Create a new file app/graphql/types/admin_mutation_type.rb with the following text:

module Types
  # Admin mutation root
  class AdminMutationType < Types::BaseObject
    description "The admin mutation root of this schema"

    field :login, mutation: Mutations::AdminLogin, description: "Admin login"

    field :create_category, mutation: Mutations::AdminCreateCategory, description: "Create a new category"

    field :create_kind, mutation: Mutations::AdminCreateKind, description: "Create a new kind"

    field :create_vendor, mutation: Mutations::AdminCreateVendor, description: "Create a new vendor"
  end
end

Update app/graphql/types/mutation_type.rb with the following code:

module Types
  # Path: app/graphql/types/mutation_type.rb
  class MutationType < Types::BaseObject
    description "The mutation root of this schema"

    field :admin, Types::AdminMutationType, null: false, description: "Admin mutations"

    def admin
	  Types::AdminMutationType
    end
  end
end

Now the new schema will be changed as follows:

type Mutation {
  admin: AdminMutation!
}

type AdminMutation {
  createCategory(
    input: AdminCreateCategoryInput!
  ): Category

  createKind(
    input: AdminCreateKindInput!
  ): Kind

  createVendor(
    input: AdminCreateVendorInput!
  ): Vendor

  login(
    input: AdminLoginInput!
  ): AdminLoginPayload
}

Now refactor test cases according to the new changes. We can also create a separate type for create for mutation of create in the admin.

The same procedure can also be done in query_type.rb while refactoring.

Happy Coding!