1 files changed, 49 insertions, 0 deletions
diff --git a/schist_queries/src/categories.rs b/schist_queries/src/categories.rs
new file mode 100644
index 0000000..f4a9747
--- /dev/null
+++ b/schist_queries/src/categories.rs
@@ -0,0 +1,49 @@
+use anyhow::{Context, Result};
+use diesel::{QueryDsl, RunQueryDsl, SelectableHelper, SqliteConnection};
+use schist_models::category::Category;
+use schist_schema::schema::categories::{self as categories_schema, dsl::categories as categories_table};
+
+pub fn delete_all_categories(connection: &mut SqliteConnection) -> Result<usize> {
+    let num_rows_deleted = diesel::delete(categories_table)
+        .execute(connection)
+        .with_context(|| "failed to delete all categories")?;
+    Ok(num_rows_deleted)
+}
+
+pub fn get_all_categories(connection: &mut SqliteConnection) -> Result<Vec<Category>> {
+    let all_categories = categories_table
+        .select(Category::as_select())
+        .load(connection)
+        .with_context(|| "failed to get all categories")?;
+    Ok(all_categories)
+}
+
+pub fn get_all_category_ids(connection: &mut SqliteConnection) -> Result<Vec<i32>> {
+    let all_category_ids = categories_table
+        .select(categories_schema::id)
+        .load(connection)
+        .with_context(|| "failed to get all category IDs")?;
+    Ok(all_category_ids)
+}
+
+pub fn insert_categories(
+    categories: &[Category],
+    connection: &mut SqliteConnection,
+) -> Result<usize> {
+    let num_categories_inserted = diesel::insert_into(categories_table)
+        .values(categories)
+        .execute(connection)
+        .with_context(|| insert_err_msg(categories))?;
+    Ok(num_categories_inserted)
+}
+
+fn insert_err_msg(categories: &[Category]) -> String {
+    format!(
+        "failed to insert categories: [{}]",
+        categories
+            .iter()
+            .map(|c| format!("\"{}\": \"{}\"", c.id, c.name))
+            .collect::<Vec<String>>()
+            .join(", ")
+    )
+}