MailglassAdmin.Preview.Mount (MailglassAdmin v1.0.0)

on_mount hook the Router macro appends after any adopter-provided :on_mount hooks. Reads the whitelisted session "mailables" value populated by the router's preview session callback and runs discovery before the preview LiveView finishes mounting.

Order (Phoenix LiveView 1.1)

preview session callback
  -> opts[:on_mount] hooks (adopter-provided, in order given)
  -> MailglassAdmin.Preview.Mount (this module)
  -> preview LiveView mount

Adopter hooks run BEFORE this one so they can short-circuit ({:halt, socket}) without triggering discovery.

v0.1 always-cont contract

This hook returns {:cont, socket} unconditionally. The dev preview dashboard remains discovery-only, while the production operator surface now uses the separate MailglassAdmin.Operator.Mount authorization hook.

Boundary classification

Submodule auto-classifies into the MailglassAdmin root boundary declared in lib/mailglass_admin.ex; classify_to: is reserved for mix tasks and protocol implementations and is not used here.

Summary

Functions

on_mount(atom, params, session, socket)

Runs Discovery.discover/1 using the session-supplied mailables value and assigns :mailables on the socket.

Functions

on_mount(atom, params, session, socket)

@spec on_mount(
  atom(),
  map() | :not_mounted_at_router,
  map(),
  Phoenix.LiveView.Socket.t()
) ::
  {:cont, Phoenix.LiveView.Socket.t()}

Runs Discovery.discover/1 using the session-supplied mailables value and assigns :mailables on the socket.

Phoenix's on_mount machinery passes the module as-is (no stage atom), so the first arg is :default.