Struct CodeGenerator 

pub struct CodeGenerator { /* private fields */ }

High-level interface for generating Rust ORM code from GraphQL schemas.

The CodeGenerator provides a unified API for generating code regardless of the underlying ORM (Diesel or Sea-ORM). It handles the complete code generation pipeline: schema introspection, parsing, and code emission.

ORM Support

• Diesel: Generates table schemas, entity structs, and database migrations
• Sea-ORM: Generates entity models, active records, and migration files

Example

use graphql_codegen_rust::{CodeGenerator, Config};
use graphql_codegen_rust::cli::{OrmType, DatabaseType};

let config = Config {
    url: "https://api.example.com/graphql".to_string(),
    orm: OrmType::Diesel,
    db: DatabaseType::Postgres,
    output_dir: "./generated".into(),
    ..Default::default()
};

let generator = CodeGenerator::new(&config.orm);
generator.generate_from_config(&config).await?;

Implementations

impl CodeGenerator

pub fn new(orm: &OrmType) -> Self

Creates a new code generator for the specified ORM type.

Parameters

• orm: The ORM to generate code for (Diesel or Sea-ORM)

Returns

A configured CodeGenerator ready to produce ORM code.

Example

use graphql_codegen_rust::{CodeGenerator, cli::OrmType};

let generator = CodeGenerator::new(&OrmType::Diesel);

pub async fn generate_from_config(&self, config: &Config) -> Result<()>

Generates complete ORM code from a GraphQL configuration.

This method orchestrates the full code generation pipeline:

1. Introspects the GraphQL schema from the configured endpoint
2. Parses the schema into an internal representation
3. Generates ORM-specific code (entities, migrations, schemas)
4. Writes generated files to the configured output directory

Parameters

• config: Complete configuration including GraphQL endpoint, ORM type, database settings, and output preferences

Returns

• Ok(()) on successful code generation
• Err(anyhow::Error) with detailed context on failure

Errors

This method can fail due to:

• Network issues when accessing the GraphQL endpoint
• Authentication failures (invalid headers)
• Schema parsing errors (invalid GraphQL schema)
• File system errors (permission issues, disk space)
• Code generation constraints (unsupported GraphQL types)

Example

use graphql_codegen_rust::{CodeGenerator, Config};
use graphql_codegen_rust::cli::{OrmType, DatabaseType};

let config = Config {
    url: "https://api.example.com/graphql".to_string(),
    orm: OrmType::Diesel,
    db: DatabaseType::Postgres,
    output_dir: "./generated".into(),
    ..Default::default()
};

let generator = CodeGenerator::new(&config.orm);
generator.generate_from_config(&config).await?;