Wrote part of posts db boilerplate

src/db/posts.rs

@@ -1,5 +1,6 @@
 use chrono::NaiveDate;
 use diesel::{insert_into, prelude::*, Insertable, PgConnection, Queryable};
+use serde::Deserialize;
 use uuid::Uuid;
 
 use crate::{
@@ -24,19 +25,27 @@ pub struct NewPost
     pub section_id: Uuid,
     pub title: Option<String>,
     pub publish_date: NaiveDate,
+    pub content: String,
 }
 
-/// Returns all posts in the database; should be used with care as this method could quickly return
-/// a large amount of data.
-///
-/// # Arguments
-///
-/// * `conn` - a reference to a database connection
-pub fn all(conn: &PgConnection) -> RbResult<Vec<Post>>
+#[derive(Deserialize, AsChangeset)]
+#[table_name = "posts"]
+pub struct PatchPost
 {
-    posts
+    pub id: Option<Uuid>,
+    pub section_id: Option<Uuid>,
+    pub title: Option<String>,
+    pub publish_date: Option<NaiveDate>,
+    pub content: Option<String>,
+}
+
+pub fn get(conn: &PgConnection, offset_: u32, limit_: u32) -> RbResult<Vec<Post>>
+{
+    Ok(posts
+        .offset(offset_.into())
+        .limit(limit_.into())
         .load::<Post>(conn)
-        .map_err(|_| RbError::DbError("Couldn't get all posts."))
+        .map_err(|_| RbError::DbError("Couldn't query posts."))?)
 }
 
 /// Insert a new post into the database.
@@ -45,14 +54,29 @@ pub fn all(conn: &PgConnection) -> RbResult<Vec<Post>>
 ///
 /// * `conn` - reference to a database connection
 /// * `new_post` - the new post object to insert
-pub fn create(conn: &PgConnection, new_post: &NewPost) -> RbResult<()>
+pub fn create(conn: &PgConnection, new_post: &NewPost) -> RbResult<Post>
 {
-    insert_into(posts)
+    Ok(insert_into(posts)
         .values(new_post)
-        .execute(conn)
-        .map_err(|_| RbError::DbError("Couldn't insert post."))?;
+        .get_result::<Post>(conn)
+        .map_err(|_| RbError::DbError("Couldn't insert post."))?)
 
     // TODO check for conflict?
+}
+
+pub fn update(conn: &PgConnection, post: &PatchPost) -> RbResult<Post>
+{
+    Ok(diesel::update(posts)
+        .set(post)
+        .get_result::<Post>(conn)
+        .map_err(|_| RbError::DbError("Couldn't update post."))?)
+}
+
+pub fn delete(conn: &PgConnection, post_id: Uuid) -> RbResult<()>
+{
+    diesel::delete(posts.filter(id.eq(post_id)))
+        .execute(conn)
+        .map_err(|_| RbError::DbError("Couldn't delete post."))?;
 
     Ok(())
 }