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//! `ConcreteOps<M>` — the manual runtime that drives every project
//! model registered via `Admin::model::<M>()`.
//!
//! Every framework-level read or write goes through one of the
//! [`AdminOps`](super::types::AdminOps) methods, which in turn calls
//! the matching free function in `crate::orm`. The trait stays
//! `pub(crate)` because handlers route through `AdminEntry::ops`
//! directly; consumers never name `ConcreteOps`.
use std::collections::HashSet;
use std::future::Future;
use std::pin::Pin;
use crate::error::Result;
use crate::http::FormData;
use crate::orm::{Db, Row};
use super::types::{
AdminModel, AdminOps, CreateResult, EditRow, ListOpts, ListPage, ListRow, UpdateResult,
};
pub(crate) struct ConcreteOps<M> {
_marker: std::marker::PhantomData<M>,
}
impl<M> ConcreteOps<M> {
pub(crate) fn new() -> Self {
Self {
_marker: std::marker::PhantomData,
}
}
}
impl<M> AdminOps for ConcreteOps<M>
where
M: AdminModel + crate::orm::Model,
{
fn list<'a>(
&'a self,
db: &'a Db,
opts: ListOpts,
) -> Pin<Box<dyn Future<Output = Result<ListPage>> + Send + 'a>> {
Box::pin(async move {
// Defense-in-depth: every column name interpolated into
// SQL must come from `M::COLUMNS`. The handler validates
// sort/filter/search names against the model's
// AdminField list, but reasserting here keeps the runtime
// safe even if a future caller forgets.
let valid: HashSet<&str> = M::COLUMNS.iter().copied().collect();
// ---- WHERE: filters + search ----
let mut where_clauses: Vec<String> = Vec::new();
let mut where_bindings: Vec<String> = Vec::new();
let mut placeholder: usize = 1;
for (col, val) in &opts.filters {
if !valid.contains(col.as_str()) {
continue;
}
// `::text` cast keeps the comparison string-shaped
// — bool / int / timestamp columns then match the
// form values produced by `display_values()`.
where_clauses.push(format!("{}::text = ${}", col, placeholder));
where_bindings.push(val.clone());
placeholder += 1;
}
if let Some((term, cols)) = &opts.search {
let term = term.trim();
if !term.is_empty() {
let valid_cols: Vec<&String> =
cols.iter().filter(|c| valid.contains(c.as_str())).collect();
if !valid_cols.is_empty() {
let p = placeholder;
let or_clauses: Vec<String> = valid_cols
.iter()
.map(|c| format!("{}::text ILIKE ${}", c, p))
.collect();
where_clauses.push(format!("({})", or_clauses.join(" OR ")));
where_bindings.push(format!("%{}%", term));
placeholder += 1;
}
}
}
let where_sql = if where_clauses.is_empty() {
String::new()
} else {
format!(" WHERE {}", where_clauses.join(" AND "))
};
// ---- ORDER BY ----
let mut order_parts: Vec<String> = Vec::with_capacity(opts.ordering.len());
for (col, dir) in &opts.ordering {
if valid.contains(col.as_str()) {
order_parts.push(format!("{} {}", col, dir.sql()));
}
}
let order_clause = if order_parts.is_empty() {
"id DESC".to_string()
} else {
order_parts.join(", ")
};
// ---- COUNT(*) over the same WHERE ----
// Done first so a paginated render that lands beyond the
// last page doesn't waste a SELECT on a row span that
// doesn't exist (the handler can clamp `page` against
// `total` if it wants to). For Tier 1 we just always run
// both — the COUNT is fast even on millions of rows when
// the WHERE is selective.
let count_sql = format!("SELECT COUNT(*) FROM {}{}", M::TABLE, where_sql);
let mut count_q = sqlx::query_scalar::<_, i64>(&count_sql);
for b in &where_bindings {
count_q = count_q.bind(b);
}
let total: i64 = count_q.fetch_one(db.pool()).await?;
// ---- SELECT page ----
let mut sql = format!(
"SELECT {} FROM {}{} ORDER BY {}",
M::COLUMNS.join(", "),
M::TABLE,
where_sql,
order_clause,
);
let limit_idx = opts.limit.map(|_| {
let i = placeholder;
placeholder += 1;
i
});
let offset_idx = opts.offset.map(|_| {
let i = placeholder;
placeholder += 1;
i
});
if let Some(i) = limit_idx {
sql.push_str(&format!(" LIMIT ${}", i));
}
if let Some(i) = offset_idx {
sql.push_str(&format!(" OFFSET ${}", i));
}
let mut q = sqlx::query(&sql);
for b in &where_bindings {
q = q.bind(b);
}
if let Some(limit) = opts.limit {
q = q.bind(limit);
}
if let Some(offset) = opts.offset {
q = q.bind(offset);
}
let rows = q.fetch_all(db.pool()).await?;
let models: Result<Vec<M>> =
rows.iter().map(|r| M::from_row(Row::from_pg(r))).collect();
let models = models?;
let list_rows = models
.into_iter()
.map(|r| {
let id = AdminModel::id(&r);
let cells: Vec<String> =
r.display_values().into_iter().map(|(_, v)| v).collect();
// FK hydration runs in the handler layer (where the
// `RelationRegistry` is reachable). The ops layer
// emits a parallel `cell_links` of all-None so the
// invariant `cells.len() == cell_links.len()` holds
// even for callers that bypass hydration.
let cell_links = vec![None; cells.len()];
ListRow {
id,
cells,
cell_links,
}
})
.collect();
Ok(ListPage {
rows: list_rows,
total,
})
})
}
fn find_row<'a>(
&'a self,
db: &'a Db,
id: i64,
) -> Pin<Box<dyn Future<Output = Result<Option<EditRow>>> + Send + 'a>> {
Box::pin(async move {
let found = crate::orm::find::<M>(db, id).await?;
Ok(found.map(|m| EditRow {
id: AdminModel::id(&m),
values: m.display_values(),
}))
})
}
fn create<'a>(&'a self, db: &'a Db, form: &'a FormData) -> CreateResult<'a> {
Box::pin(async move {
match M::from_form(form) {
Ok(model) => match crate::orm::create(db, &model).await {
Ok(id) => Ok(Ok(id)),
// Postgres constraint violations route to
// `Error::Conflict` via `From<sqlx::Error>`. Catch
// them here so the user sees a re-rendered form
// with an inline error instead of a 500.
Err(crate::error::Error::Conflict(msg)) => {
log::warn!("create rejected by DB constraint: {msg}");
Ok(Err(vec!["Invalid value or constraint violation. \
Please check the highlighted fields and try again."
.into()]))
}
Err(other) => Err(other),
},
Err(errs) => Ok(Err(errs)),
}
})
}
fn update<'a>(&'a self, db: &'a Db, id: i64, form: &'a FormData) -> UpdateResult<'a> {
Box::pin(async move {
match M::from_form(form) {
Ok(model) => match crate::orm::update(db, id, &model).await {
Ok(()) => Ok(Ok(())),
Err(crate::error::Error::Conflict(msg)) => {
log::warn!("update rejected by DB constraint: {msg}");
Ok(Err(vec!["Invalid value or constraint violation. \
Please check the highlighted fields and try again."
.into()]))
}
Err(other) => Err(other),
},
Err(errs) => Ok(Err(errs)),
}
})
}
fn delete<'a>(
&'a self,
db: &'a Db,
id: i64,
) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'a>> {
Box::pin(async move { crate::orm::delete::<M>(db, id).await })
}
fn object_label<'a>(
&'a self,
db: &'a Db,
id: i64,
) -> Pin<Box<dyn Future<Output = Result<Option<String>>> + Send + 'a>> {
Box::pin(async move {
let found = crate::orm::find::<M>(db, id).await?;
Ok(found.map(|m| m.object_label()))
})
}
}