GraphQL

Example of GraphQL application with Go.

Setup skeleton project:

---

Follow all steps in the documentation of gqlgen

Generating files based on schema.graphqls:

---

This command should be executed if your schema.graphqls has modified.

go run github.com/99designs/gqlgen generate

Creating SQLite database:

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# For connect on database
sqlite3 db.sqlite

-- For create table categories
create table categories(
    id string primary key,
    name string,
    description string
);

-- For create table courses
create table courses(
    id string primary key,
    name string,
    description string,
    category_id string,
    foreign key (category_id) references categories(id)
);

Running server:

---

go run cmd/server/server.go

Example of mutations:

# Create a new category
mutation createCategoryQl {
  createCategory(input: {
    name: "My first category"
    description: "My first category description"
  }) {
    id
    name
    description
  }
}

# Create a new course
mutation createCourseQl {
  createCourse(input: {
    name: "My first course"
    description: "My first course description"
    categoryId: "8cdd0884-bebc-4af5-a657-b666d62cec18"
  }) {
    id
    name
    description
    category {
      id
      name
      description
    }
  }
}

Example of queries:

# Find all categories with courses
query findAllCategories {
  categories {
    id
    name
    description
    courses {
      id
      name
      description
    }
  }
}

# Find all courses with category
query findAllCourses {
  courses {
    id
    name
    description
    category {
      id
      name
      description
    }
  }
}