Adds topics api endpoints

api/src/api/topic.rs

@@ -0,0 +1,57 @@
+
+use super::{
+    models::{self, *},
+    *,
+};
+
+#[derive(Debug, GraphQLObject, serde::Deserialize, serde::Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Topic {
+    #[graphql(description = "Topic ID as integer")]
+    id: i32,
+    #[graphql(description = "Human readable topic name, in english")]
+    name: String,
+}
+
+#[derive(Debug, Clone, Default, GraphQLInputObject, serde::Serialize, serde::Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct TopicFilter {
+    pub ids: Option<Vec<i32>>,
+    pub name_like: Option<String>,
+}
+
+#[rocket::async_trait]
+impl Showable<models::Topic, TopicFilter> for Topic {
+    fn sort_field_to_order_by(field: &str) -> Option<models::TopicOrderBy> {
+        match field {
+            "id" => Some(TopicOrderBy::Id),
+            _ => None,
+        }
+    }
+
+    fn filter_to_select(_context: &Context, filter: Option<TopicFilter>) -> FieldResult<models::SelectTopic> {
+        if let Some(f) = filter {
+            Ok(models::SelectTopic {
+                id_in: f.ids,
+                name_like: into_like_search(f.name_like),
+                ..Default::default()
+            })
+        } else {
+            Ok(Default::default())
+        }
+    }
+
+    fn select_by_id(_context: &Context, id: i32) -> FieldResult<models::SelectTopic> {
+        Ok(models::SelectTopic {
+            id_eq: Some(id),
+            ..Default::default()
+        })
+    }
+
+    async fn db_to_graphql(_context: &Context, d: models::Topic) -> AsamiResult<Self> {
+        Ok(Topic {
+            id: d.attrs.id,
+            name: d.attrs.name,
+        })
+    }
+}