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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more

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phoenix_kit lib phoenix_kit schema_prefix.ex
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lib/phoenix_kit/schema_prefix.ex 

defmodule PhoenixKit.SchemaPrefix do

  @moduledoc """

  Applies the configured schema prefix to a PhoenixKit Ecto schema.



  `use PhoenixKit.SchemaPrefix` sets `@schema_prefix` from



      config :phoenix_kit, prefix: "myschema"



  so every query, insert, preload, join, and bulk operation built on the

  schema targets the named Postgres schema the migrations installed into

  — without the host having to point the database role's `search_path`

  at it. When no prefix is configured (the default `public` install),

  `@schema_prefix` compiles to `nil` — equivalent to unset — and

  behavior is unchanged.



  This is **compile-time** configuration (read via

  `Application.compile_env/2` while the host compiles phoenix_kit):

  set it in `config/config.exs`, not `runtime.exs`. Mix tracks the value

  and recompiles the schemas when it changes. That matches the nature of

  the setting — an install's schema prefix is fixed at `mix

  phoenix_kit.install --prefix ...` time and never changes at runtime.



  A stale build cannot silently target the wrong schema: Elixir records

  `compile_env` values and validates them when the application boots

  (`Config.Provider.validate_compile_env/1`), so phoenix_kit compiled

  before the prefix was configured raises a clear "compiled with a

  different value" error instead of quietly querying `public`. Any

  `mix compile`/`phx.server`/`release` after the config change

  recompiles the schemas automatically.



  Every table-backed schema in PhoenixKit must `use` this module right

  after `use Ecto.Schema` (a conformance test enforces it). Embedded

  schemas don't need it.

  """



  defmacro __using__(_opts) do

    quote do

      @schema_prefix Application.compile_env(:phoenix_kit, :prefix)

    end

  end

end