/
category.rs
280 lines (245 loc) · 9.14 KB
/
category.rs
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use std::collections::HashSet;
use time::Timespec;
use conduit::{Request, Response};
use conduit_router::RequestParams;
use pg::GenericConnection;
use pg::rows::Row;
use {Model, Crate};
use db::RequestTransaction;
use util::{RequestUtils, CargoResult, ChainError};
use util::errors::NotFound;
#[derive(Clone)]
pub struct Category {
pub id: i32,
pub category: String,
pub slug: String,
pub description: String,
pub created_at: Timespec,
pub crates_cnt: i32,
}
#[derive(RustcEncodable, RustcDecodable)]
pub struct EncodableCategory {
pub id: String,
pub category: String,
pub slug: String,
pub description: String,
pub created_at: String,
pub crates_cnt: i32,
}
#[derive(RustcEncodable, RustcDecodable)]
pub struct EncodableCategoryWithSubcategories {
pub id: String,
pub category: String,
pub slug: String,
pub description: String,
pub created_at: String,
pub crates_cnt: i32,
pub subcategories: Vec<EncodableCategory>,
}
impl Category {
pub fn find_by_category(conn: &GenericConnection, name: &str)
-> CargoResult<Category> {
let stmt = conn.prepare("SELECT * FROM categories \
WHERE category = $1")?;
let rows = stmt.query(&[&name])?;
rows.iter().next()
.chain_error(|| NotFound)
.map(|row| Model::from_row(&row))
}
pub fn find_by_slug(conn: &GenericConnection, slug: &str)
-> CargoResult<Category> {
let stmt = conn.prepare("SELECT * FROM categories \
WHERE slug = LOWER($1)")?;
let rows = stmt.query(&[&slug])?;
rows.iter().next()
.chain_error(|| NotFound)
.map(|row| Model::from_row(&row))
}
pub fn encodable(self) -> EncodableCategory {
let Category {
id: _, crates_cnt, category, slug, description, created_at
} = self;
EncodableCategory {
id: slug.clone(),
slug: slug.clone(),
description: description.clone(),
created_at: ::encode_time(created_at),
crates_cnt: crates_cnt,
category: category,
}
}
pub fn update_crate(conn: &GenericConnection,
krate: &Crate,
categories: &[String]) -> CargoResult<Vec<String>> {
let old_categories = krate.categories(conn)?;
let old_categories_ids: HashSet<_> = old_categories.iter().map(|cat| {
cat.id
}).collect();
// If a new category specified is not in the database, filter
// it out and don't add it. Return it to be able to warn about it.
let mut invalid_categories = vec![];
let new_categories: Vec<Category> = categories.iter().flat_map(|c| {
match Category::find_by_slug(conn, &c) {
Ok(cat) => Some(cat),
Err(_) => {
invalid_categories.push(c.to_string());
None
},
}
}).collect();
let new_categories_ids: HashSet<_> = new_categories.iter().map(|cat| {
cat.id
}).collect();
let to_rm: Vec<_> = old_categories_ids
.difference(&new_categories_ids)
.cloned()
.collect();
let to_add: Vec<_> = new_categories_ids
.difference(&old_categories_ids)
.cloned()
.collect();
if !to_rm.is_empty() {
conn.execute("DELETE FROM crates_categories \
WHERE category_id = ANY($1) \
AND crate_id = $2",
&[&to_rm, &krate.id])?;
}
if !to_add.is_empty() {
let insert: Vec<_> = to_add.into_iter().map(|id| {
format!("({}, {})", krate.id, id)
}).collect();
let insert = insert.join(", ");
conn.execute(&format!("INSERT INTO crates_categories \
(crate_id, category_id) VALUES {}",
insert),
&[])?;
}
Ok(invalid_categories)
}
pub fn count_toplevel(conn: &GenericConnection) -> CargoResult<i64> {
let sql = format!("\
SELECT COUNT(*) \
FROM {} \
WHERE category NOT LIKE '%::%'",
Model::table_name(None::<Self>
));
let stmt = conn.prepare(&sql)?;
let rows = stmt.query(&[])?;
Ok(rows.iter().next().unwrap().get("count"))
}
pub fn toplevel(conn: &GenericConnection,
sort: &str,
limit: i64,
offset: i64) -> CargoResult<Vec<Category>> {
let sort_sql = match sort {
"crates" => "ORDER BY crates_cnt DESC",
_ => "ORDER BY category ASC",
};
// Collect all the top-level categories and sum up the crates_cnt of
// the crates in all subcategories
let stmt = conn.prepare(&format!(
"SELECT c.id, c.category, c.slug, c.description, c.created_at, \
COALESCE (( \
SELECT sum(c2.crates_cnt)::int \
FROM categories as c2 \
WHERE c2.slug = c.slug \
OR c2.slug LIKE c.slug || '::%' \
), 0) as crates_cnt \
FROM categories as c \
WHERE c.category NOT LIKE '%::%' {} \
LIMIT $1 OFFSET $2",
sort_sql
))?;
let categories: Vec<_> = stmt.query(&[&limit, &offset])?
.iter()
.map(|row| Model::from_row(&row))
.collect();
Ok(categories)
}
pub fn subcategories(&self, conn: &GenericConnection)
-> CargoResult<Vec<Category>> {
let stmt = conn.prepare("\
SELECT c.id, c.category, c.slug, c.description, c.created_at, \
COALESCE (( \
SELECT sum(c2.crates_cnt)::int \
FROM categories as c2 \
WHERE c2.slug = c.slug \
OR c2.slug LIKE c.slug || '::%' \
), 0) as crates_cnt \
FROM categories as c \
WHERE c.category ILIKE $1 || '::%' \
AND c.category NOT ILIKE $1 || '::%::%'")?;
let rows = stmt.query(&[&self.category])?;
Ok(rows.iter().map(|r| Model::from_row(&r)).collect())
}
}
impl Model for Category {
fn from_row(row: &Row) -> Category {
Category {
id: row.get("id"),
created_at: row.get("created_at"),
crates_cnt: row.get("crates_cnt"),
category: row.get("category"),
slug: row.get("slug"),
description: row.get("description"),
}
}
fn table_name(_: Option<Category>) -> &'static str { "categories" }
}
/// Handles the `GET /categories` route.
pub fn index(req: &mut Request) -> CargoResult<Response> {
let conn = req.tx()?;
let (offset, limit) = req.pagination(10, 100)?;
let query = req.query();
let sort = query.get("sort").map_or("alpha", String::as_str);
let categories = Category::toplevel(conn, sort, limit, offset)?;
let categories = categories.into_iter().map(Category::encodable).collect();
// Query for the total count of categories
let total = Category::count_toplevel(conn)?;
#[derive(RustcEncodable)]
struct R { categories: Vec<EncodableCategory>, meta: Meta }
#[derive(RustcEncodable)]
struct Meta { total: i64 }
Ok(req.json(&R {
categories: categories,
meta: Meta { total: total },
}))
}
/// Handles the `GET /categories/:category_id` route.
pub fn show(req: &mut Request) -> CargoResult<Response> {
let slug = &req.params()["category_id"];
let conn = req.tx()?;
let cat = Category::find_by_slug(&*conn, &slug)?;
let subcats = cat.subcategories(&*conn)?.into_iter().map(|s| {
s.encodable()
}).collect();
let cat = cat.encodable();
let cat_with_subcats = EncodableCategoryWithSubcategories {
id: cat.id,
category: cat.category,
slug: cat.slug,
description: cat.description,
created_at: cat.created_at,
crates_cnt: cat.crates_cnt,
subcategories: subcats,
};
#[derive(RustcEncodable)]
struct R { category: EncodableCategoryWithSubcategories}
Ok(req.json(&R { category: cat_with_subcats }))
}
/// Handles the `GET /category_slugs` route.
pub fn slugs(req: &mut Request) -> CargoResult<Response> {
let conn = req.tx()?;
let stmt = conn.prepare("SELECT slug FROM categories \
ORDER BY slug")?;
let rows = stmt.query(&[])?;
#[derive(RustcEncodable)]
struct Slug { id: String, slug: String }
let slugs: Vec<Slug> = rows.iter().map(|r| {
let slug: String = r.get("slug");
Slug { id: slug.clone(), slug: slug }
}).collect();
#[derive(RustcEncodable)]
struct R { category_slugs: Vec<Slug> }
Ok(req.json(&R { category_slugs: slugs }))
}