schema: make user fields non-nullable

They can always be empty. This simplifies mutation, since graphql_client
doesn't have an easy way to conditionally leave out fields (we could do
that with `@include`, but that's one bool per field in addition to the
field, a bit ugly).

server/src/domain/handler.rs

@@ -8,9 +8,9 @@ use std::collections::HashSet;
 pub struct User {
     pub user_id: String,
     pub email: String,
-    pub display_name: Option<String>,
-    pub first_name: Option<String>,
-    pub last_name: Option<String>,
+    pub display_name: String,
+    pub first_name: String,
+    pub last_name: String,
     // pub avatar: ?,
     pub creation_date: chrono::DateTime<chrono::Utc>,
 }
@@ -21,9 +21,9 @@ impl Default for User {
         User {
             user_id: String::new(),
             email: String::new(),
-            display_name: None,
-            first_name: None,
-            last_name: None,
+            display_name: String::new(),
+            first_name: String::new(),
+            last_name: String::new(),
             creation_date: chrono::Utc.timestamp(0, 0),
         }
     }

server/src/domain/sql_backend_handler.rs

@@ -3,7 +3,7 @@ use crate::infra::configuration::Configuration;
 use async_trait::async_trait;
 use futures_util::StreamExt;
 use futures_util::TryStreamExt;
-use sea_query::{Expr, Iden, Order, Query, SimpleExpr, Value};
+use sea_query::{Expr, Iden, Order, Query, SimpleExpr};
 use sqlx::Row;
 use std::collections::HashSet;
 
@@ -179,9 +179,9 @@ impl BackendHandler for SqlBackendHandler {
         let values = vec![
             request.user_id.clone().into(),
             request.email.into(),
-            request.display_name.map(Into::into).unwrap_or(Value::Null),
-            request.first_name.map(Into::into).unwrap_or(Value::Null),
-            request.last_name.map(Into::into).unwrap_or(Value::Null),
+            request.display_name.unwrap_or_default().into(),
+            request.first_name.unwrap_or_default().into(),
+            request.last_name.unwrap_or_default().into(),
             chrono::Utc::now().naive_utc().into(),
         ];
         let query = Query::insert()

server/src/domain/sql_tables.rs

@@ -49,9 +49,13 @@ pub async fn init_table(pool: &Pool) -> sqlx::Result<()> {
                     .primary_key(),
             )
             .col(ColumnDef::new(Users::Email).string_len(255).not_null())
-            .col(ColumnDef::new(Users::DisplayName).string_len(255))
-            .col(ColumnDef::new(Users::FirstName).string_len(255))
-            .col(ColumnDef::new(Users::LastName).string_len(255))
+            .col(
+                ColumnDef::new(Users::DisplayName)
+                    .string_len(255)
+                    .not_null(),
+            )
+            .col(ColumnDef::new(Users::FirstName).string_len(255).not_null())
+            .col(ColumnDef::new(Users::LastName).string_len(255).not_null())
             .col(ColumnDef::new(Users::Avatar).binary())
             .col(ColumnDef::new(Users::CreationDate).date_time().not_null())
             .col(ColumnDef::new(Users::PasswordHash).binary())

server/src/infra/graphql/query.rs

@@ -141,16 +141,16 @@ impl<Handler: BackendHandler + Sync> User<Handler> {
         &self.user.email
     }
 
-    fn display_name(&self) -> Option<&String> {
-        self.user.display_name.as_ref()
+    fn display_name(&self) -> &str {
+        &self.user.display_name
     }
 
-    fn first_name(&self) -> Option<&String> {
-        self.user.first_name.as_ref()
+    fn first_name(&self) -> &str {
+        &self.user.first_name
     }
 
-    fn last_name(&self) -> Option<&String> {
-        self.user.last_name.as_ref()
+    fn last_name(&self) -> &str {
+        &self.user.last_name
     }
 
     fn creation_date(&self) -> chrono::DateTime<chrono::Utc> {

server/src/infra/ldap_handler.rs

@@ -69,12 +69,9 @@ fn get_attribute(user: &User, attribute: &str) -> Result<Vec<String>> {
         ]),
         "uid" => Ok(vec![user.user_id.clone()]),
         "mail" => Ok(vec![user.email.clone()]),
-        "givenName" => Ok(vec![user.first_name.clone().unwrap_or_default()]),
-        "sn" => Ok(vec![user.last_name.clone().unwrap_or_default()]),
-        "cn" => Ok(vec![user
-            .display_name
-            .clone()
-            .unwrap_or_else(|| user.user_id.clone())]),
+        "givenName" => Ok(vec![user.first_name.clone()]),
+        "sn" => Ok(vec![user.last_name.clone()]),
+        "cn" => Ok(vec![user.display_name.clone()]),
         _ => bail!("Unsupported attribute: {}", attribute),
     }
 }
@@ -479,17 +476,17 @@ mod tests {
                 User {
                     user_id: "bob_1".to_string(),
                     email: "bob@bobmail.bob".to_string(),
-                    display_name: Some("Bôb Böbberson".to_string()),
-                    first_name: Some("Bôb".to_string()),
-                    last_name: Some("Böbberson".to_string()),
+                    display_name: "Bôb Böbberson".to_string(),
+                    first_name: "Bôb".to_string(),
+                    last_name: "Böbberson".to_string(),
                     ..Default::default()
                 },
                 User {
                     user_id: "jim".to_string(),
                     email: "jim@cricket.jim".to_string(),
-                    display_name: Some("Jimminy Cricket".to_string()),
-                    first_name: Some("Jim".to_string()),
-                    last_name: Some("Cricket".to_string()),
+                    display_name: "Jimminy Cricket".to_string(),
+                    first_name: "Jim".to_string(),
+                    last_name: "Cricket".to_string(),
                     ..Default::default()
                 },
             ])