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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
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Files
lib/modules/shop/import/option_builder.ex
defmodule PhoenixKit.Modules.Shop.Import.OptionBuilder do
@moduledoc """
Build option values and price modifiers from Shopify variant rows.
Extracts Option1/Option2 names and values from CSV rows,
calculates base price (minimum) and price modifiers (deltas from base).
"""
@doc """
Build options data from variant rows.
Returns a map with:
- base_price: minimum variant price (Decimal)
- option1_name: name of first option (e.g., "Size")
- option1_values: list of unique values for option1
- option1_modifiers: map of value => price delta from base
- option2_name: name of second option (e.g., "Color")
- option2_values: list of unique values for option2
## Examples
OptionBuilder.build_from_variants(rows)
# => %{
# base_price: Decimal.new("22.80"),
# option1_name: "Size",
# option1_values: ["4 inches (10 cm)", "5 inches (13 cm)", ...],
# option1_modifiers: %{"4 inches (10 cm)" => "0", "5 inches (13 cm)" => "5.00", ...},
# option2_name: "Color",
# option2_values: ["Black", "White", ...]
# }
"""
def build_from_variants(rows) when is_list(rows) do
# Get option names from first row
first_row = List.first(rows)
option1_name = get_non_empty(first_row, "Option1 Name")
option2_name = get_non_empty(first_row, "Option2 Name")
# Extract variants with prices
variants =
rows
|> Enum.map(fn row ->
%{
option1_value: get_non_empty(row, "Option1 Value"),
option2_value: get_non_empty(row, "Option2 Value"),
price: parse_price(row["Variant Price"])
}
end)
|> Enum.filter(& &1.price)
# Calculate base price (minimum)
base_price =
variants
|> Enum.map(& &1.price)
|> Enum.min(fn -> Decimal.new("0") end)
# Build option1 data (typically Size - affects price)
{option1_values, option1_modifiers} = build_option_data(variants, :option1_value, base_price)
# Build option2 values (typically Color - no price impact, just values)
option2_values = get_unique_values(variants, :option2_value)
%{
base_price: base_price,
option1_name: option1_name,
option1_values: option1_values,
option1_modifiers: option1_modifiers,
option2_name: option2_name,
option2_values: option2_values
}
end
# Private helpers
defp get_non_empty(row, key) do
case row[key] do
nil -> nil
"" -> nil
value -> String.trim(value)
end
end
defp parse_price(nil), do: nil
defp parse_price(""), do: nil
defp parse_price(str) when is_binary(str) do
str = String.trim(str)
case Decimal.parse(str) do
{decimal, _} -> decimal
:error -> nil
end
end
defp build_option_data(variants, field, base_price) do
# Get unique values preserving order of first appearance
values =
variants
|> Enum.map(&Map.get(&1, field))
|> Enum.reject(&is_nil/1)
|> Enum.uniq()
# Build price modifiers for each value
# Group by value and take the first price for each
price_by_value =
variants
|> Enum.reduce(%{}, fn v, acc ->
value = Map.get(v, field)
if value && !Map.has_key?(acc, value) do
Map.put(acc, value, v.price)
else
acc
end
end)
# Calculate modifiers as delta from base price
modifiers =
price_by_value
|> Enum.reduce(%{}, fn {value, price}, acc ->
modifier = Decimal.sub(price, base_price)
Map.put(acc, value, Decimal.to_string(modifier))
end)
{values, modifiers}
end
defp get_unique_values(variants, field) do
variants
|> Enum.map(&Map.get(&1, field))
|> Enum.reject(&is_nil/1)
|> Enum.uniq()
end
end