🚀 GQLSchemaGen v1.0.0: Generate GraphQL Schemas from Go Code

#go #graphql #webdev #programming

I'm excited to release GQLSchemaGen v1.0.0 - a code-first GraphQL schema generator for Go that eliminates the tedious work of manually maintaining .graphqls files.

The Problem

If you've built GraphQL APIs in Go, you know the pain:

Write Go structs for your models
Manually create matching GraphQL schemas
Keep them in sync as your API evolves
Repeat for types, inputs, and enums

One missed update and your schema is out of sync. 😓

The Solution

GQLSchemaGen generates GraphQL schemas directly from your Go code using simple annotations:

// @gqlType
type User struct {
    ID        string    `gql:"id,type:ID"`
    Name      string    `gql:"name"`
    Email     string    `gql:"email"`
    CreatedAt time.Time `gql:"createdAt,ro"` // Read-only
}

Run gqlschemagen generate and get:

type User @goModel(model: "your-module.User") {
  id: ID!
  name: String!
  email: String!
  createdAt: String!
}

Features

🎯 Advanced Field Control - Mark fields as read-only, write-only, or conditionally included
🧬 Generics Support - Works with Go 1.18+ generic types seamlessly
🔄 Auto-Discovery - Automatically generates schemas for referenced types
🔧 Scalar Mappings - Map uuid.UUID → ID, time.Time → DateTime globally
🗂️ Namespace Organization - Keep large schemas organized
⚙️ gqlgen Integration - Generates @goModel and @goField directives

Real-World Example

Generate multiple GraphQL types from a single Go struct:

// @gqlType(name:"User")
// @gqlType(name:"PublicUser", ignoreAll:"true")
// @gqlInput(name:"CreateUserInput")
// @gqlInput(name:"UpdateUserInput")
type User struct {
    ID       string `gql:"id,type:ID,ro"`
    Name     string `gql:"name,include:*"`
    Email    string `gql:"email,include:User"` // Only in User type
    Password string `gql:"password,wo"`        // Write-only
}

Generated schema:

type User @goModel(model: "your-module.User") {
  id: ID!
  name: String!
  email: String!
  # Password excluded (write-only)
}

type PublicUser @goModel(model: "your-module.User") {
  id: ID!
  name: String!
  # Email excluded (not in include list)
  # Password excluded (write-only)
}

input CreateUserInput {
  id: ID!
  name: String!
  # Email excluded (not in include list)
  password: String!
}

input UpdateUserInput {
  id: ID!
  name: String!
  # Email excluded (not in include list)
  password: String!
}

One Go struct, 4 different GraphQL definitions with precise field control!

Get Started

# Install
go install github.com/pablor21/gqlschemagen@latest

# Initialize config
gqlschemagen init

# Generate schemas
gqlschemagen generate --gqlgen