feat: implement full-text search functionality with API integration, add search router and persistence logic, and create related schemas and tests

thoughts-backend/app/src/persistence/search.rs

@@ -0,0 +1,65 @@
+use models::{
+    domains::{thought, user},
+    schemas::thought::ThoughtWithAuthor,
+};
+use sea_orm::{
+    prelude::{Expr, Uuid},
+    DatabaseConnection, DbErr, EntityTrait, JoinType, QueryFilter, QuerySelect, RelationTrait,
+    Value,
+};
+
+use crate::persistence::follow;
+
+fn is_visible(
+    author_id: Uuid,
+    viewer_id: Option<Uuid>,
+    friend_ids: &[Uuid],
+    visibility: &thought::Visibility,
+) -> bool {
+    match visibility {
+        thought::Visibility::Public => true,
+        thought::Visibility::Private => viewer_id.map_or(false, |v| v == author_id),
+        thought::Visibility::FriendsOnly => {
+            viewer_id.map_or(false, |v| v == author_id || friend_ids.contains(&author_id))
+        }
+    }
+}
+
+pub async fn search_thoughts(
+    db: &DatabaseConnection,
+    query: &str,
+    viewer_id: Option<Uuid>,
+) -> Result<Vec<ThoughtWithAuthor>, DbErr> {
+    let mut friend_ids = Vec::new();
+    if let Some(viewer) = viewer_id {
+        friend_ids = follow::get_friend_ids(db, viewer).await?;
+    }
+
+    // We must join with the user table to get the author's username
+    let thoughts_with_authors = thought::Entity::find()
+        .column_as(user::Column::Username, "author_username")
+        .join(JoinType::InnerJoin, thought::Relation::User.def())
+        .filter(Expr::cust_with_values(
+            "thought.search_document @@ websearch_to_tsquery('english', $1)",
+            [Value::from(query)],
+        ))
+        .into_model::<ThoughtWithAuthor>() // Convert directly in the query
+        .all(db)
+        .await?;
+
+    // Apply visibility filtering in Rust after the search
+    Ok(thoughts_with_authors
+        .into_iter()
+        .filter(|t| is_visible(t.author_id, viewer_id, &friend_ids, &t.visibility))
+        .collect())
+}
+
+pub async fn search_users(db: &DatabaseConnection, query: &str) -> Result<Vec<user::Model>, DbErr> {
+    user::Entity::find()
+        .filter(Expr::cust_with_values(
+            "\"user\".search_document @@ websearch_to_tsquery('english', $1)",
+            [Value::from(query)],
+        ))
+        .all(db)
+        .await
+}