Added axum graphql example

examples/axum-graphql_example/.env

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+DATABASE_URL=sqlite:./db?mode=rwc

examples/axum-graphql_example/Cargo.toml

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+[package]
+name = "axum-graphql"
+authors = ["Aaron Leopold <[email protected]>"]
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[workspace]
+members = [".", "entity", "migration"]
+
+[dependencies]
+tokio = { version = "1.0", features = ["full"] }
+axum = "0.4.8"
+dotenv = "0.15.0"
+async-graphql-axum = "3.0.31"
+entity = { path = "entity" }
+migration = { path = "migration" }

examples/axum-graphql_example/entity/Cargo.toml

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+[package]
+name = "entity"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+name = "entity"
+path = "src/lib.rs"
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+
+[dependencies.async-graphql]
+version = "3.0.12"
+
+[dependencies.sea-orm]
+version = "^0.6.0"
+features = [
+  "macros",
+  "runtime-tokio-native-tls",
+  # "sqlx-postgres",
+  # "sqlx-mysql",
+  "sqlx-sqlite"
+]
+default-features = false

examples/axum-graphql_example/entity/src/lib.rs

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+pub mod note;
+
+pub use async_graphql;
+pub use sea_orm;

examples/axum-graphql_example/entity/src/note.rs

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+use async_graphql::*;
+use sea_orm::{entity::prelude::*, DeleteMany};
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize, SimpleObject)]
+#[sea_orm(table_name = "notes")]
+#[graphql(concrete(name = "Note", params()))]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    #[serde(skip_deserializing)]
+    pub id: i32,
+    pub title: String,
+    pub text: String,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter)]
+pub enum Relation {}
+
+impl RelationTrait for Relation {
+    fn def(&self) -> RelationDef {
+        panic!("No RelationDef")
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}
+
+impl Entity {
+    pub fn find_by_id(id: i32) -> Select<Entity> {
+        Self::find().filter(Column::Id.eq(id))
+    }
+
+    pub fn find_by_title(title: &str) -> Select<Entity> {
+        Self::find().filter(Column::Title.eq(title))
+    }
+
+    pub fn delete_by_id(id: i32) -> DeleteMany<Entity> {
+        Self::delete_many().filter(Column::Id.eq(id))
+    }
+}

examples/axum-graphql_example/migration/Cargo.toml

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+[package]
+name = "migration"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+name = "migration"
+path = "src/lib.rs"
+
+[dependencies]
+sea-schema = { version = "0.5.0", default-features = false, features = [ "migration", "debug-print" ] }
+dotenv = "0.15.0"
+entity = { path = "../entity" }

examples/axum-graphql_example/migration/README.md

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+# Running Migrator CLI
+
+- Apply all pending migrations
+    ```sh
+    cargo run
+    ```
+    ```sh
+    cargo run -- up
+    ```
+- Apply first 10 pending migrations
+    ```sh
+    cargo run -- up -n 10
+    ```
+- Rollback last applied migrations
+    ```sh
+    cargo run -- down
+    ```
+- Rollback last 10 applied migrations
+    ```sh
+    cargo run -- down -n 10
+    ```
+- Drop all tables from the database, then reapply all migrations
+    ```sh
+    cargo run -- fresh
+    ```
+- Rollback all applied migrations, then reapply all migrations
+    ```sh
+    cargo run -- refresh
+    ```
+- Rollback all applied migrations
+    ```sh
+    cargo run -- reset
+    ```
+- Check the status of all migrations
+    ```sh
+    cargo run -- status
+    ```

examples/axum-graphql_example/migration/src/lib.rs

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+pub use sea_schema::migration::*;
+
+mod m20220101_000001_create_table;
+
+pub struct Migrator;
+
+#[async_trait::async_trait]
+impl MigratorTrait for Migrator {
+    fn migrations() -> Vec<Box<dyn MigrationTrait>> {
+        vec![Box::new(m20220101_000001_create_table::Migration)]
+    }
+}

examples/axum-graphql_example/migration/src/m20220101_000001_create_table.rs

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+use entity::{
+    note,
+    sea_orm::{DbBackend, EntityTrait, Schema},
+};
+use sea_schema::migration::{
+    sea_query::{self, *},
+    *,
+};
+
+pub struct Migration;
+
+fn get_seaorm_create_stmt<E: EntityTrait>(e: E) -> TableCreateStatement {
+    let schema = Schema::new(DbBackend::Sqlite);
+
+    schema
+        .create_table_from_entity(e)
+        .if_not_exists()
+        .to_owned()
+}
+
+fn get_seaorm_drop_stmt<E: EntityTrait>(e: E) -> TableDropStatement {
+    Table::drop().table(e).if_exists().to_owned()
+}
+
+impl MigrationName for Migration {
+    fn name(&self) -> &str {
+        "m20220101_000001_create_table"
+    }
+}
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        let stmts = vec![get_seaorm_create_stmt(note::Entity)];
+
+        for stmt in stmts {
+            manager.create_table(stmt.to_owned()).await?;
+        }
+
+        Ok(())
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        let stmts = vec![get_seaorm_drop_stmt(note::Entity)];
+
+        for stmt in stmts {
+            manager.drop_table(stmt.to_owned()).await?;
+        }
+
+        Ok(())
+    }
+}

examples/axum-graphql_example/migration/src/main.rs

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+use migration::Migrator;
+use sea_schema::migration::*;
+use std::path::PathBuf;
+
+#[cfg(debug_assertions)]
+use dotenv::dotenv;
+
+#[async_std::main]
+async fn main() {
+    #[cfg(debug_assertions)]
+    dotenv().ok();
+
+    let fallback = "sqlite:./db?mode=rwc";
+
+    match std::env::var("DATABASE_URL") {
+        Ok(val) => {
+            println!("Using DATABASE_URL: {}", val);
+        }
+        Err(_) => {
+            std::env::set_var("DATABASE_URL", fallback);
+            println!("Set DATABASE_URL: {}", fallback);
+        }
+    };
+
+    cli::run_cli(Migrator).await;
+}

examples/axum-graphql_example/src/db.rs

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+use entity::sea_orm;
+use sea_orm::DatabaseConnection;
+
+pub struct Database {
+    pub connection: DatabaseConnection,
+}
+
+impl Database {
+    pub async fn new() -> Self {
+        let connection = sea_orm::Database::connect(std::env::var("DATABASE_URL").unwrap())
+            .await
+            .expect("Could not connect to database");
+
+        Database { connection }
+    }
+
+    pub fn get_connection(&self) -> &DatabaseConnection {
+        &self.connection
+    }
+}

examples/axum-graphql_example/src/graphql/mod.rs

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+pub mod mutation;
+pub mod query;
+pub mod schema;

examples/axum-graphql_example/src/graphql/mutation/mod.rs

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+use entity::async_graphql;
+
+pub mod note;
+
+pub use note::NoteMutation;
+
+// Add your other ones here to create a unified Mutation object
+// e.x. Mutation(NoteMutation, OtherMutation, OtherOtherMutation)
+#[derive(async_graphql::MergedObject, Default)]
+pub struct Mutation(NoteMutation);

examples/axum-graphql_example/src/graphql/mutation/note.rs

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+use async_graphql::{Context, Object, Result};
+use entity::async_graphql::{self, InputObject, SimpleObject};
+use entity::note;
+use entity::sea_orm::{ActiveModelTrait, Set};
+
+use crate::db::Database;
+
+// I normally separate the input types into separate files/modules, but this is just
+// a quick example.
+
+#[derive(InputObject)]
+pub struct CreateNoteInput {
+    pub title: String,
+    pub text: String,
+}
+
+#[derive(SimpleObject)]
+pub struct DeleteResult {
+    pub success: bool,
+    pub rows_affected: u64,
+}
+
+#[derive(Default)]
+pub struct NoteMutation;
+
+#[Object]
+impl NoteMutation {
+    pub async fn create_note(
+        &self,
+        ctx: &Context<'_>,
+        input: CreateNoteInput,
+    ) -> Result<note::Model> {
+        let db = ctx.data::<Database>().unwrap();
+
+        let note = note::ActiveModel {
+            title: Set(input.title),
+            text: Set(input.text),
+            ..Default::default()
+        };
+
+        Ok(note.insert(db.get_connection()).await?)
+    }
+
+    pub async fn delete_note(&self, ctx: &Context<'_>, id: i32) -> Result<DeleteResult> {
+        let db = ctx.data::<Database>().unwrap();
+
+        let res = note::Entity::delete_by_id(id)
+            .exec(db.get_connection())
+            .await?;
+
+        if res.rows_affected <= 1 {
+            Ok(DeleteResult {
+                success: true,
+                rows_affected: res.rows_affected,
+            })
+        } else {
+            unimplemented!()
+        }
+    }
+}

examples/axum-graphql_example/src/graphql/query/mod.rs

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+use entity::async_graphql;
+
+pub mod note;
+
+pub use note::NoteQuery;
+
+// Add your other ones here to create a unified Query object
+// e.x. Query(NoteQuery, OtherQuery, OtherOtherQuery)
+#[derive(async_graphql::MergedObject, Default)]
+pub struct Query(NoteQuery);

examples/axum-graphql_example/src/graphql/query/note.rs

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+use async_graphql::{Context, Object, Result};
+use entity::{async_graphql, note, sea_orm::EntityTrait};
+
+use crate::db::Database;
+
+#[derive(Default)]
+pub struct NoteQuery;
+
+#[Object]
+impl NoteQuery {
+    async fn get_notes(&self, ctx: &Context<'_>) -> Result<Vec<note::Model>> {
+        let db = ctx.data::<Database>().unwrap();
+
+        Ok(note::Entity::find()
+            .all(db.get_connection())
+            .await
+            .map_err(|e| e.to_string())?)
+    }
+
+    async fn get_note_by_id(&self, ctx: &Context<'_>, id: i32) -> Result<Option<note::Model>> {
+        let db = ctx.data::<Database>().unwrap();
+
+        Ok(note::Entity::find_by_id(id)
+            .one(db.get_connection())
+            .await
+            .map_err(|e| e.to_string())?)
+    }
+}

examples/axum-graphql_example/src/graphql/schema.rs

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+use async_graphql::{EmptySubscription, Schema};
+use entity::async_graphql;
+
+use crate::{
+    db::Database,
+    graphql::{mutation::Mutation, query::Query},
+};
+
+pub type AppSchema = Schema<Query, Mutation, EmptySubscription>;
+
+/// Builds the GraphQL Schema, attaching the Database to the context
+pub async fn build_schema() -> AppSchema {
+    let db = Database::new().await;
+
+    Schema::build(Query::default(), Mutation::default(), EmptySubscription)
+        .data(db)
+        .finish()
+}