Exemplos:
mutation createCategory { createCategory( input: { name: "PHP", description: "PHP is awesome" } ) { id name description } }
mutation createCourse { createCourse( input: { name: "Evolving with PHP", description: "Mega PHP is awesome" categoryId: "T5577006791947779410" } ) { id name description category { id name } } }
mutation createChapter { createChapter( input: { name: "Evolving with PHP", courseId: "T8674665223082153551" } ) { id name course { id name } } }
query findCategories { categories { id name description courses { name description } } }
query findCourses { courses { id name description chapters { id name } category { id name } } }
query findChapters { chapters { id name course { id name } } }