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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
Current section
Files
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Files
lib/phoenix_kit/migrations/postgres/v97.ex
defmodule PhoenixKit.Migrations.Postgres.V97 do
@moduledoc """
V97: Per-item markup override.
Adds a nullable `markup_percentage DECIMAL(7, 2)` column on
`phoenix_kit_cat_items`. When `NULL`, pricing falls back to the parent
catalogue's `markup_percentage`; when set (including `0`), the item
uses its own value.
This lets individual items carry a different margin from the rest of
the catalogue without needing a second catalogue or a separate
pricing table. `NULL` vs. `0` is load-bearing: `0` means "explicitly
sell at base price", `NULL` means "inherit whatever the catalogue
currently uses".
The column is nullable with no default, matching the semantic
distinction. Existing rows stay `NULL` and continue to inherit — no
backfill is needed.
"""
use Ecto.Migration
def up(opts) do
prefix = Map.get(opts, :prefix, "public")
p = prefix_str(prefix)
schema = if prefix == "public", do: "public", else: prefix
execute("""
DO $$
BEGIN
IF NOT EXISTS (
SELECT FROM information_schema.columns
WHERE table_schema = '#{schema}'
AND table_name = 'phoenix_kit_cat_items'
AND column_name = 'markup_percentage'
) THEN
ALTER TABLE #{p}phoenix_kit_cat_items
ADD COLUMN markup_percentage DECIMAL(7, 2);
END IF;
END $$;
""")
execute("COMMENT ON TABLE #{p}phoenix_kit IS '97'")
end
@doc """
Rolls V97 back by dropping the per-item `markup_percentage` column.
**Lossy rollback:** any per-item overrides set after V97 are lost —
affected items revert to the catalogue's markup. Back up before
rolling back in production.
"""
def down(opts) do
prefix = Map.get(opts, :prefix, "public")
p = prefix_str(prefix)
execute("ALTER TABLE #{p}phoenix_kit_cat_items DROP COLUMN IF EXISTS markup_percentage")
execute("COMMENT ON TABLE #{p}phoenix_kit IS '96'")
end
defp prefix_str("public"), do: "public."
defp prefix_str(prefix), do: "#{prefix}."
end