Changelog

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All notable changes to Caravela are documented here.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

[0.7.0] — 2026-04-18

Removed (breaking)

  • can_read / can_create / can_update / can_delete macros and the __caravela_permission__/2,3,4 dispatch functions they emitted. These ran in parallel with phase 9's policy blocks, producing an implicit intersection of two authorization systems with no documentation of the interaction. Since the library has no published users yet, the simpler path was to delete outright instead of deprecating.
  • Caravela.Schema.Permission struct and the permissions field on Caravela.Schema.Domain.
  • Generated context helpers apply_read_permission/3, authorize_create/2, authorize_update/3, authorize_delete/3. Read paths now go through apply_scope/3; write paths go through policy_authorize/3,4. Both resolve against the policy block's compiled dispatch functions on the domain module.

Migration

Port every can_* declaration into a policy :entity do … end block. Rule functions now receive the actor (context.current_user), not the raw context map:

# before
can_read   :books, fn q, ctx -> where(q, [b], b.published) end
can_create :books, fn ctx -> ctx.current_user.role == :admin end
can_update :books, fn b, ctx -> ctx.current_user.id == b.author_id end
can_delete :books, fn _b, ctx -> ctx.current_user.role == :admin end

# after
policy :books do
  scope fn q, actor -> if actor.role == :admin, do: q, else: where(q, [b], b.published) end

  allow :create, fn actor -> actor.role == :admin end
  allow :update, fn actor, record -> actor.id == record.author_id end
  allow :delete, fn actor -> actor.role == :admin end
end

The generated context is the one that did the dispatch, so the only runtime change is the shape of the predicate's first argument.

[0.6.0] — 2026-04-18

Added

  • Phase 7 — authenticatable trait. Declare authenticatable on an entity and mix caravela.gen.auth emits the full email/password
    • API-token server stack: auth context (register/login/logout, sessions with TTL + remember_me + max_sessions, email confirmation, password reset, scoped API tokens), session schema, Plug pipeline (fetch_current_user, require_auth, require_role, require_scope), LiveView on_mount hooks, auth controller, and a session-tokens migration. on_register / on_login lifecycle callbacks. Validated compile-time: one authenticatable entity per domain, :email field required when :password strategy is used, no collision with auto-injected hashed_password / confirmed_at / api_tokens.
  • Phase 8 — LiveSvelte auth UI. mix caravela.gen.auth also emits six Svelte components — LoginForm, RegisterForm (inputs derived from the user entity's public fields), ResetPasswordForm (two-phase: request + confirm), ConfirmEmail, TokenManager (scopes + max_tokens reflected from the DSL), SessionList — plus matching LiveView pages (AuthLive.*), and prints a ready-to- paste router snippet (public auth routes + authenticated live_session with on_mount hook + authenticated API scope). Generated User schema gains registration_changeset, password_changeset, api_tokens_changeset, confirm_changeset with Argon2 password hashing. TS types add CurrentUser, ApiToken, Session. Flags --skip-ui / --skip-router for server-only use.
  • Phase 9 — Triple-target policies. New policy :entity do … end block in the domain DSL compiles a single declaration into three simultaneous enforcement layers: (1) Ecto WHERE clauses via scope fn query, actor -> query end, (2) field projection that strips invisible fields from every list_* / get_* response via field :name, visible: fn actor[, record] -> bool end, and (3) a typed field_access Svelte prop (<Entity>FieldAccess TypeScript interface) that the generated index/show/form components use to gate ruled columns, fields, and inputs with {#if field_access.*}. allow :create | :update | :delete, fn actor[, record] -> bool end extends the Phase 2 permission check with record-aware gates. Arity-1 rules resolve to booleans at request time; arity-2 rules resolve to a 'per_record' sentinel and evaluate per row, with denied fields served as null. Unpolicied entities fall through to permissive defaults — fully backward-compatible with existing can_* hooks.
  • Caravela.Policy module with Entry, Scope, FieldRule, ActionGate IR structs, and Domain.policy_for/2 / auth_entity/1 lookups.
  • New guides: docs/auth.md, docs/policies.md.

Changed

  • Generated TypeScript type imports are now combined (import type { Book, BookFieldAccess, LiveHandle } from '…') instead of one line per type.
  • Generated User Ecto schema excludes hashed_password, confirmed_at, api_tokens from the generic cast path — they flow only through the specialised changesets above.
  • Caravela.Gen.Svelte.public_fields_for/1 also strips credential fields (hashed_password, api_tokens) from the Svelte-bound representation, so they can never reach the browser through either the typed TS interface or a CRUD form.

[0.5.3] — 2026-04-18

Added

  • Caravela.Error — uniform error struct (:unauthorized, :not_found, :invalid, :internal) so upstream code can pattern- match once instead of threading the four shapes individually generated contexts return today. wrap/1 lifts a plain reason into the struct; message/1 renders a default flash phrase.
  • Caravela.Live.OnMount — on_mount callback that assigns a :context map (%{current_user, tenant}) to the socket, so LiveViews can read from @context instead of each re-rolling build_context/1. put/3 exposes a merge helper for downstream hooks.
  • Caravela.Gen.Context now emits a delete_<entity>(id, context) variant alongside the existing (struct, context) form, so delete-from-index is one round trip (get |> delete). Returns {:error, :not_found} when the id is missing or hidden. The generated index LiveView uses the shorter path.

Changed

  • Generated --with-domain form LiveView now passes keyword args (apply_updater(:load, entity: e, attrs: a, errors: er) and apply_updater(:put_attr, field: f, value: v)) instead of anonymous tuples. The emitted FormDomain matches with Keyword.fetch!/2. Self-documenting and survives adding a new field without silently shifting positional args.

Fixed

  • Generated Svelte components now destructure the live hook handle LiveSvelte ≥ 0.18 actually injects, and call live.pushEvent(...). Previously every generated component pulled pushEvent out of $props() — which never existed — so every Edit / Delete / New / Save / Cancel button silently threw TypeError: pushEvent is not a function and the corresponding server event never fired.
  • Caravela.Gen.Context now emits preload([:assoc, …]) on list_* / get_* / get_*! for every belongs_to association declared on the entity. Rows no longer ship the raw %Ecto.Association.NotLoaded{} sentinel (with __owner__ / __field__ / __cardinality__ internals) to the browser, and dereferencing book.author.name on the Svelte side now works without a hand-written preload.
  • Generated --with-domain and plain form LiveViews replace the Map.from_struct(entity) |> Map.drop([:__meta__]) attrs seed with a narrow entity_attrs/1 helper that keeps only the declared entity fields and normalises %Decimal{} values to their string form. Form inputs on an Edit screen no longer render [object Object] for decimal / money fields, and the attrs map has stable types across validate round-trips.

Changed

  • Generated LiveView render/1 now calls <LiveSvelte.svelte> (passing socket={@socket}) instead of the deprecated <LiveSvelte.render> component. Silences the deprecation warning on every request and re-enables SSR for connected sockets.
  • New Caravela.Live.Encoders module provides LiveSvelte.Encoder protocol implementations for Decimal (→ normalised string) and Ecto.Association.NotLoaded (→ nil), guarded so the file compiles even when LiveSvelte < 0.18 is in use (the protocol is absent there).
  • Generated TypeScript types file now exports a LiveHandle interface describing live.pushEvent / pushEventTo / handleEvent, which every generated component imports for its live prop.

[0.5.2] — 2026-04-18

Changed

  • Generated Svelte components and doc examples now use Svelte 5's $props() rune for prop declarations instead of the deprecated export let syntax. LiveSvelte 0.19 ships with Svelte 5 runtime; export let still worked but produced compile-time warnings.

[0.5.1] — 2026-04-18

Fixed

  • Generated --with-domain form LiveView no longer crashes with KeyError :errors on mount. The template now seeds the domain's default state (via Caravela.Live.Template.__assign_defaults__/2) before the first apply_updater(:load, ...) call.
  • Caravela.Flow.Runner — race advances as soon as the first task resolves instead of waiting the full timeout (was relying on Task.yield_many/2's "wait for all, take first").
  • Caravela.Gen.Context emits simplified authorize_* / run_delete_hook functions when no corresponding can_* / on_delete rule is declared, eliminating the "clause will never match" warnings that appeared on every compile of a fresh CRUD generation.
  • Caravela.Gen.SvelteForm and Caravela.Gen.Svelte now emit Svelte 5 event attribute syntax (onchange={...}, oninput={...}, onclick={...}, onsubmit={...}) instead of the deprecated on:event directive form.

Added

  • Caravela.Flow — :tag start option. When set, every notification is delivered wrapped as {:caravela_flow, tag, original_msg}, letting a single listener driving many flows demultiplex without forwarder processes.

Changed

  • Caravela.Live.Domain / Caravela.Live.Form — when the updater / on_event / visible macros reject a value they can't arity-check at compile time, the error message now points the reader at the accepted shapes (fn ... end or &Module.fun/N) and the wrap-it-in-fn workaround for bound function variables.
  • Caravela.Gen.Migration moduledoc now documents the :timestamp option for deterministic output (snapshot tests / demo pages). Behavior unchanged; only documentation.

[0.5.0] — 2026-04-18

Phase 5 — dynamic Svelte forms with server-driven visibility and async validation, plus the Caravela.Flow GenServer runtime for composable async workflows.

Added

  • Caravela.Live.Form — DSL layered on Caravela.Live.Domain for form-visibility predicates (visible/2) and async field validators (validate_async/3). Each form-domain module exposes __caravela_form__/0, __caravela_form_visibility__/1, __caravela_form_visible__/2, and __caravela_form_validate_async__/3 for introspection and runtime dispatch.
  • Caravela.Gen.SvelteForm — generator that reads a form-domain module plus its owning Caravela.Schema.Domain and emits <Entity>FormDynamic.svelte. The component declares field_visibility / async_errors props, wraps guarded fields in {#if field_visibility.*}, and debounces async-validation pushEvent calls client-side.
  • Caravela.Flow / Caravela.Flow.DSL — use Caravela.Flow plus flow/3, sequence, repeat, wait, wait_until, debounce, set_state, run, parallel, race, and each macros. Compiles to nested step-tree structs in Caravela.Flow.Steps.
  • Caravela.Flow.Runner — GenServer interpreting step trees. Supports retry/backoff (linear + exponential), wait_until that unblocks on signal/2, debounce that resets on state change during the pause, parallel/race task orchestration, and per-item each iteration with {:ok|:skip|:error, _} returns.
  • Caravela.Flow.Supervisor — optional DynamicSupervisor for flow runners. Caravela.Flow.start/3 attaches runners when the supervisor is running, falls back to unsupervised start_link otherwise (useful in tests and tooling).
  • Top-level API: Caravela.Flow.start/3, Caravela.Flow.signal/2, Caravela.Flow.get_state/1, Caravela.Flow.stop/1,2. Flows deliver {:flow_state, _}, {:flow_done, _}, and {:flow_error, _} messages to the :notify pid.
  • docs/flows.md — new guide covering the flow DSL, primitives, the real-time loop through LiveView + LiveSvelte, and the scope boundary (no event sourcing).
  • docs/live_runtime.md — extended with Caravela.Live.Form and Caravela.Gen.SvelteForm sections.

Scope

  • Flows are strictly ephemeral: in-memory state, no persistence, no event sourcing. Teams needing durable event streams should use Commanded.

0.4.0 — 2026-04-17

Phase 4 — LiveView + typed Svelte component generation, Caravela.Live.* runtime for composable state, and a docs restructure.

Added

  • mix caravela.gen.live — generates three LiveView modules per entity (index / show / form) plus matching typed Svelte components and a TypeScript interfaces file. LiveViews mount components via <LiveSvelte.render> and delegate CRUD to the generated context, so authorization, hooks, and multi-tenant scoping apply for free.
  • Caravela.Gen.LiveView + Caravela.Gen.Svelte — EEx-backed generators that emit index/show/form templates. Both respect the # --- CUSTOM --- marker (TypeScript uses // --- CUSTOM ---, Svelte uses <!-- --- CUSTOM --- -->).
  • Caravela.Gen.LiveRoute — prints a live router scope snippet with four routes per entity (index, :new, :show, :edit), analogous to Caravela.Gen.RouterScope for the JSON API.
  • --with-domain flag on mix caravela.gen.live — also emits a Caravela.Live.Domain companion module per entity and regenerates form.ex from a Template-backed variant. Index and show stay plain. Useful as an onramp to the Caravela.Live.* runtime.
  • Caravela.Live.Updater — composable assigns-transformer helpers: run/2,3, compose/2, embed/2, and the ~> pipe operator.
  • Caravela.Live.Domain — use macro with state, updater, on_event, and on_info DSL for server-side state machines. Compile-time checks enforce updater arity (1 or 2) and require string event names. The use block sets @caravela_live_domain __MODULE__ so apply_updater/2,3 resolves inside domain bodies without an explicit module argument.
  • Caravela.Live.Template — use Caravela.Live.Template, domain: Mod binds a LiveView to a Live.Domain module, injecting mount/3, handle_event/3, handle_info/2, and apply_updater/2,3. Unknown events log a warning instead of crashing; all callbacks are defoverridable.
  • Naming helpers: live_module/3, live_file_path/3, svelte_component_name/2, svelte_component_ref/3, svelte_file_path/3, svelte_types_file_path/1 — all version-aware.
  • Documentation split into topic guides under docs/ (getting_started, dsl, generators, multi_tenancy, versioning, graphql, livesvelte, live_runtime, regeneration), wired into mix docs as ex_doc extras. README trimmed to a minimal entry point.
  • GitHub Actions workflow (docs.yml) that deploys mix docs output to GitHub Pages on every push to main. HexDocs continues to publish on tag release.

Changed

  • BC-preserving rename. Caravela.Live.Updater.apply/2,3 → run/2,3 to avoid shadowing Kernel.apply/2,3. apply/2,3 remains as an undocumented alias.
  • Generated Svelte BookShow.svelte now renders fields with the same null-safe expression as the index, so a missing field prints — instead of undefined.
  • Generated Svelte BookIndex.svelte now includes a "New book" button that dispatches pushEvent('new', {}); the matching handle_event navigates to the form route.

Fixed

  • Caravela.Live.Domain docstring previously showed an example that wouldn't compile: apply_updater/2,3 was invoked inside on_event bodies but the macro required @caravela_live_domain, which was only set by use Caravela.Live.Template. Now set by Caravela.Live.Domain too.
  • Removed an unused dirty local from the generated Svelte form.

0.3.0 — 2026-04-17

Phase 3 — multi-tenancy, API versioning, Absinthe/GraphQL generation.

Added

  • use Caravela.Domain, multi_tenant: true — opts into row-level multi-tenancy. Caravela.Tenant auto-injects a :tenant_id (:binary_id, null: false) field into every entity, and the generated context gains scope_tenant/2 + inject_tenant_id/2 helpers driven by context.tenant.id.
  • Migrations in multi-tenant domains add the tenant_id column and composite [:tenant_id, :<fk>] indexes alongside each FK index, plus a standalone [:tenant_id] index on tables with no FKs.
  • version "v1" DSL directive — all generated Elixir modules and file paths are namespaced under the version segment (MyApp.Library.V1.Book, MyAppWeb.V1.BookController, lib/my_app/library/v1/book.ex). The router snippet is emitted at scope "/api/v1", MyAppWeb.V1. Table names stay version-free so rows are shared across versions.
  • Two new compile-time validations: invalid version format (must match ~r/^v\d+$/) and manual :tenant_id declarations colliding with auto-injection.
  • Caravela.Gen.GraphQL — renders Absinthe object types, query object, and mutation object (with typed input objects) for the domain. Every resolver delegates to the generated context, so authorization, hooks, and tenant scoping apply to GraphQL for free. Tenant-injected fields are hidden from both object and input types.
  • mix caravela.gen.graphql task — checks for Absinthe at runtime and prints an actionable error if the optional dependencies are missing.
  • Generated controllers read conn.assigns[:tenant] into the context when the domain is multi-tenant.

0.2.0 — 2026-04-17

Phase 2 — hooks, permissions, Phoenix context + JSON API generators.

Added

  • Hook DSL: on_create/2, on_update/2, on_delete/2 on any entity. Hooks run between authorization and the final Repo call in the generated context. on_delete may return {:error, reason} to abort the delete.
  • Permission DSL: can_read/2, can_create/2, can_update/2, can_delete/2. can_read is applied as an Ecto query filter; the other three return booleans and a false short-circuits the context function with {:error, :unauthorized}.
  • Compiled domain modules expose __caravela_hook__/4 and __caravela_permission__ dispatch functions with safe fallbacks.
  • Three new compile-time validations: hook / permission arity, unknown entity references, duplicate (action, entity) declarations.
  • Caravela.Gen.Context — Phoenix context generator with CRUD functions per entity (list_, get_, get_!, change_, create_, update_, delete_).
  • Caravela.Gen.Controller — JSON controller generator (REST actions, standard status codes, changeset → 422 translation).
  • Caravela.Gen.RouterScope — prints the scope "/api", MyAppWeb do … end snippet to paste into the host app's router.
  • Caravela.Gen.Custom — preserves user code below the # --- CUSTOM --- marker across regenerations. Schemas, contexts, and controllers all ship with the marker.
  • Mix tasks: caravela.gen.context, caravela.gen.api, and the all-in-one caravela.gen.

0.1.0 — 2026-04-17

Initial public release. Phase 1 — DSL, compiler, and schema/migration generators.

Added

  • Caravela.Domain DSL: entity, field, relation.
  • Caravela.Compiler with six compile-time validations: unknown field types, numeric-constraint/type mismatches, duplicate entities, dangling relation targets, incompatible cardinality, circular required belongs_to chains.
  • Caravela.Gen.EctoSchema — Ecto schema generator (with changeset, required/format/length/numeric validations).
  • Caravela.Gen.Migration — Ecto migration generator, topologically sorted, with foreign-key indexes and appropriate on_delete rules derived from required:.
  • mix caravela.gen.schema MyApp.Domains.<Module> task with --dry-run and --force options.
  • :binary_id primary and foreign keys by default.