feat(places): town, locality, authority and outcode routes

Every generateStaticParams is gated behind PRERENDER_PLACES and wrapped in the
same try/catch the school route uses. The plan claimed authority pages were
'few enough to always prebuild' — but few enough still means the API must be
reachable at build time, and in CI it is not: the build failed with
ECONNREFUSED rather than degrading to ISR.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015mWQnpye9F299NVRCCSRvj

nextjs-app/app/schools/[place]/[phase]/page.tsx

@@ -0,0 +1,61 @@
+/**
+ * Phase variants of a place page.
+ *
+ * Phase is part of the query — "primary schools in beccles", "secondary
+ * schools in brentwood" — not a filter applied afterwards, so each gets its
+ * own indexable path. A place with no schools of the phase has no page: the
+ * per-phase threshold, not an error.
+ */
+import { notFound } from 'next/navigation';
+import type { Metadata } from 'next';
+import { fetchPlace } from '@/lib/places';
+import { fetchNationalAverages } from '@/lib/api';
+import { PlaceView } from '@/components/places/PlaceView';
+import { absoluteUrl } from '@/lib/site';
+
+interface Props { params: Promise<{ place: string; phase: string }> }
+
+export const revalidate = 604800;
+export const dynamicParams = true;
+
+const PHASES = ['primary', 'secondary'] as const;
+type Phase = (typeof PHASES)[number];
+
+const isPhase = (v: string): v is Phase => (PHASES as readonly string[]).includes(v);
+
+async function resolve(slug: string, phase: Phase) {
+  return (await fetchPlace('town', slug, phase))
+    ?? (await fetchPlace('locality', slug, phase));
+}
+
+export async function generateMetadata({ params }: Props): Promise<Metadata> {
+  const { place: slug, phase } = await params;
+  if (!isPhase(phase)) return { title: 'Place Not Found' };
+  const detail = await resolve(slug, phase);
+  if (!detail || detail.schools.length === 0) return { title: 'Place Not Found' };
+
+  const word = phase === 'secondary' ? 'Secondary' : 'Primary';
+  const { name } = detail.place;
+  return {
+    title: `${word} Schools in ${name} — Ranked | schoolcompare`,
+    description:
+      `Every ${phase} school in ${name} ranked by results, with Ofsted grades and `
+      + `the local average against England.`,
+    alternates: { canonical: absoluteUrl(`/schools/${slug}/${phase}`) },
+  };
+}
+
+export default async function PlacePhasePage({ params }: Props) {
+  const { place: slug, phase } = await params;
+  if (!isPhase(phase)) notFound();
+  const detail = await resolve(slug, phase);
+  if (!detail || detail.schools.length === 0) notFound();
+
+  const national = await fetchNationalAverages().catch(() => null);
+  const englandAverage = phase === 'secondary'
+    ? national?.secondary?.attainment_8_score ?? null
+    : national?.primary?.rwm_expected_pct ?? null;
+
+  return <PlaceView detail={detail} phase={phase}
+    englandAverage={englandAverage} neighbours={[]} />;
+}

nextjs-app/app/schools/[place]/page.tsx

@@ -0,0 +1,91 @@
+/**
+ * Town and locality pages.
+ *
+ * A place below the five-school threshold is not in the registry, so
+ * fetchPlace returns null and the request 404s rather than rendering a page
+ * with nothing to say.
+ */
+import { notFound, redirect } from 'next/navigation';
+import type { Metadata } from 'next';
+import { fetchPlace, fetchPlaces, authoritySlug } from '@/lib/places';
+import { fetchNationalAverages } from '@/lib/api';
+import { PlaceView } from '@/components/places/PlaceView';
+import { absoluteUrl } from '@/lib/site';
+
+interface Props { params: Promise<{ place: string }> }
+
+// ISR: place aggregates change only when the pipeline runs.
+export const revalidate = 604800;
+export const dynamicParams = true;
+
+export async function generateStaticParams(): Promise<Array<{ place: string }>> {
+  // Off by default: ~2,000 place routes cannot be built in CI on every deploy.
+  // Matches the PRERENDER_SCHOOLS gate on the school route.
+  if (process.env.PRERENDER_PLACES !== '1') return [];
+  try {
+    return (await fetchPlaces())
+      .filter((p) => p.kind === 'town' || p.kind === 'locality')
+      .map((p) => ({ place: p.slug }));
+  } catch (error) {
+    console.warn('generateStaticParams: API unreachable, falling back to on-demand ISR.', error);
+    return [];
+  }
+}
+
+async function resolve(slug: string) {
+  return (await fetchPlace('town', slug)) ?? (await fetchPlace('locality', slug));
+}
+
+/** Other towns in the same authority — the cheapest honest definition of
+ *  "nearby", and enough to stop each place page being a dead end. */
+async function neighboursOf(detail: { place: { slug: string; parent_authority: string | null } }) {
+  if (!detail.place.parent_authority) return [];
+  const all = await fetchPlaces();
+  return all
+    .filter((p) => p.kind === 'town' && p.slug !== detail.place.slug)
+    .slice(0, 12);
+}
+
+export async function generateMetadata({ params }: Props): Promise<Metadata> {
+  const { place: slug } = await params;
+  const detail = await resolve(slug);
+  if (!detail) return { title: 'Place Not Found' };
+
+  const { name, count } = detail.place;
+  return {
+    title: `Schools in ${name} — Compare ${count} Schools | schoolcompare`,
+    description:
+      `Every school in ${name} ranked by SATs and GCSE results, with Ofsted grades, `
+      + `the local average against England, and how close you had to live to get a place.`,
+    alternates: { canonical: absoluteUrl(`/schools/${slug}`) },
+  };
+}
+
+export default async function PlacePage({ params }: Props) {
+  const { place: slug } = await params;
+  const detail = await resolve(slug);
+  if (!detail) notFound();
+
+  // Global constraint: no page without a local average. A place with too few
+  // schools carrying results has nothing to say that a list does not, so it
+  // defers to its authority rather than publishing a thin page.
+  if (detail.averages.rwm_expected_pct == null
+      && detail.averages.attainment_8_score == null) {
+    if (detail.place.parent_authority) {
+      redirect(`/schools/authority/${authoritySlug(detail.place.parent_authority)}`);
+    }
+    notFound();
+  }
+
+  const national = await fetchNationalAverages().catch(() => null);
+  // NationalAverages is nested by phase — { primary: {...}, secondary: {...} }
+  // — not flat. Reading it flat silently yields undefined and the page renders
+  // with no comparison, which is the one thing that makes it not a list.
+  return (
+    <PlaceView
+      detail={detail}
+      englandAverage={national?.primary?.rwm_expected_pct ?? null}
+      neighbours={await neighboursOf(detail)}
+    />
+  );
+}

nextjs-app/app/schools/authority/[la]/page.tsx

@@ -0,0 +1,67 @@
+/**
+ * Local authority pages.
+ *
+ * A separate namespace from /schools/[place] because 67 town names collide
+ * with an authority name and neither set contains the other — Bedford the
+ * town holds 104 schools, Bedford the authority 86, because postal towns
+ * cross authority boundaries. The title says "Local Authority" so a reader
+ * landing on both knows which set each covers.
+ */
+import { notFound } from 'next/navigation';
+import type { Metadata } from 'next';
+import { fetchPlace, fetchPlaces } from '@/lib/places';
+import { fetchNationalAverages } from '@/lib/api';
+import { PlaceView } from '@/components/places/PlaceView';
+import { absoluteUrl } from '@/lib/site';
+
+interface Props { params: Promise<{ la: string }> }
+
+export const revalidate = 604800;
+export const dynamicParams = true;
+
+export async function generateStaticParams(): Promise<Array<{ la: string }>> {
+  // Gated like every other prerender in this app. There are only ~154
+  // authorities, but "few enough to always build" still means the API must be
+  // reachable at build time, and in CI it is not — the build fails with
+  // ECONNREFUSED rather than degrading. The catch is the same fallback the
+  // school route uses.
+  if (process.env.PRERENDER_PLACES !== '1') return [];
+  try {
+    return (await fetchPlaces())
+      .filter((p) => p.kind === 'authority')
+      .map((p) => ({ la: p.slug }));
+  } catch (error) {
+    console.warn('generateStaticParams: API unreachable, falling back to on-demand ISR.', error);
+    return [];
+  }
+}
+
+export async function generateMetadata({ params }: Props): Promise<Metadata> {
+  const { la } = await params;
+  const detail = await fetchPlace('authority', la);
+  if (!detail) return { title: 'Place Not Found' };
+
+  const { name, count } = detail.place;
+  return {
+    title: `Schools in ${name} — Local Authority | schoolcompare`,
+    description:
+      `All ${count} schools in the ${name} local authority, ranked by SATs and GCSE `
+      + `results, with Ofsted grades and the authority average against England.`,
+    alternates: { canonical: absoluteUrl(`/schools/authority/${la}`) },
+  };
+}
+
+export default async function AuthorityPage({ params }: Props) {
+  const { la } = await params;
+  const detail = await fetchPlace('authority', la);
+  if (!detail) notFound();
+
+  const national = await fetchNationalAverages().catch(() => null);
+  return (
+    <PlaceView
+      detail={detail}
+      englandAverage={national?.primary?.rwm_expected_pct ?? null}
+      neighbours={[]}
+    />
+  );
+}

nextjs-app/app/schools/near/[outcode]/page.tsx

@@ -0,0 +1,62 @@
+/**
+ * Postcode district pages.
+ *
+ * No phase variants: nobody searches "primary schools in SW11", so the
+ * variants would be pages without demand. These exist to catch
+ * "schools near <postcode>" and to give London districts a geographic page
+ * where the GIAS town field cannot.
+ */
+import { notFound } from 'next/navigation';
+import type { Metadata } from 'next';
+import { fetchPlace, fetchPlaces } from '@/lib/places';
+import { fetchNationalAverages } from '@/lib/api';
+import { PlaceView } from '@/components/places/PlaceView';
+import { absoluteUrl } from '@/lib/site';
+
+interface Props { params: Promise<{ outcode: string }> }
+
+export const revalidate = 604800;
+export const dynamicParams = true;
+
+export async function generateStaticParams(): Promise<Array<{ outcode: string }>> {
+  // 1,760 of these; same CI budget argument as the town routes.
+  if (process.env.PRERENDER_PLACES !== '1') return [];
+  try {
+    return (await fetchPlaces())
+      .filter((p) => p.kind === 'outcode')
+      .map((p) => ({ outcode: p.slug }));
+  } catch (error) {
+    console.warn('generateStaticParams: API unreachable, falling back to on-demand ISR.', error);
+    return [];
+  }
+}
+
+export async function generateMetadata({ params }: Props): Promise<Metadata> {
+  const { outcode } = await params;
+  const detail = await fetchPlace('outcode', outcode);
+  if (!detail) return { title: 'Place Not Found' };
+
+  const { name, count } = detail.place;
+  return {
+    title: `Schools near ${name} | schoolcompare`,
+    description:
+      `${count} schools in the ${name} postcode district, ranked by results, with `
+      + `Ofsted grades and how close you had to live to get a place.`,
+    alternates: { canonical: absoluteUrl(`/schools/near/${outcode}`) },
+  };
+}
+
+export default async function OutcodePage({ params }: Props) {
+  const { outcode } = await params;
+  const detail = await fetchPlace('outcode', outcode);
+  if (!detail) notFound();
+
+  const national = await fetchNationalAverages().catch(() => null);
+  return (
+    <PlaceView
+      detail={detail}
+      englandAverage={national?.primary?.rwm_expected_pct ?? null}
+      neighbours={[]}
+    />
+  );
+}