Do I need to change my table name 'classes' into 'clazzes' ?

[razertory]

I created 3 tables. Including 2 N-N tables (subjects, classes )and 1 
relation table(classes_subjects)
  up do
    run 'CREATE EXTENSION IF NOT EXISTS "uuid-ossp"'

    create_table(:classes) do
      uuid :id, default: Sequel.function(:uuid_generate_v4), primary_key: 
true

      uuid :kindergarten_id, null: false
      uuid :grade_id, null: false

      String :name, size: 255, null: false
      String :description, size: 1000, text: true

      DateTime :deleted_at
      DateTime :created_at, null: false, default: Sequel::CURRENT_TIMESTAMP
      DateTime :updated_at, null: false, default: Sequel::CURRENT_TIMESTAMP
    end

    add_index :classes, :kindergarten_id, where: "deleted_at IS NULL"
    add_index :classes, :grade_id, where: "deleted_at IS NULL"
  end

  down do
    drop_table(:classes)
  end

end


  up do
    run 'CREATE EXTENSION IF NOT EXISTS "uuid-ossp"'

    create_table(:subjects) do
      uuid :id, default: Sequel.function(:uuid_generate_v4), primary_key: 
true

      uuid :teacher_id, null: false
      uuid :kindergarten_id, null: false

      String :name, null: false, size: 255
      String :description, size: 1000, text: true
      DateTime :start_time
      DateTime :end_time
      String :range, default: 'class' # ['class', 'grade']

      DateTime :deleted_at
      DateTime :created_at, null: false, default: Sequel::CURRENT_TIMESTAMP
      DateTime :updated_at, null: false, default: Sequel::CURRENT_TIMESTAMP
    end

    add_index :subjects, :teacher_id, where: "deleted_at IS NULL"
    add_index :subjects, :kindergarten_id, where: "deleted_at IS NULL"
  end

  down do
    drop_table(:subjects)
  end

end

  up do
    run 'CREATE EXTENSION IF NOT EXISTS "uuid-ossp"'

    create_table(:classes_subjects) do
      uuid :id, default: Sequel.function(:uuid_generate_v4), primary_key: 
true

      uuid :subject_id, null: false
      uuid :class_id, null: false

      DateTime :created_at, null: false, default: Sequel::CURRENT_TIMESTAMP
    end

    add_index :classes_subjects, :subject_id
  end

  down do
    drop_table(:classes_subjects)
  end

end



When I use 'Subject.association_join(:classes).where(class_id: 
'dsadadsadsadadafasfafaf')' .It errors like:
Enter code here...NoMethodError: undefined method `dataset' for Class:Class
As the 'NoMethodError' refers.Do I need to change my table name 'classes' 
into 'clazzes' ?

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