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# frozen_string_literal: true
module ActiveElement
module Components
module Util
# Provides options for a `<input type="number" />` element based on database column properties.
class NumericField
def initialize(field:, column:)
@field = field
@column = column
end
def options
{
step: step,
min: min,
max: max
}.compact
end
private
attr_reader :field, :column
def step
return 'any' if column.blank?
return '1' if column.type == :integer
return 'any' if column.try(:scale).blank?
"0.#{'1'.rjust(column.scale, '0')}"
end
def min
return min_decimal if column.try(:precision).present?
return min_integer if column.try(:limit).present?
nil
end
def max
return max_decimal if column.try(:precision).present?
return max_integer if column.try(:limit).present?
nil
end
# XXX: This is the theoretical maximum value for a column with a given precision but,
# since the maximum database value is constrained by total significant figures (i.e.
# before and after the decimal point), an input can still be provided that would cause an
# error, so the default controller rescues `ActiveRecord::RangeError` to deal with this.
def max_decimal
'9' * column.precision
end
def min_decimal
"-#{'9' * column.precision}"
end
# `limit` represents available bytes for storing a signed integer e.g.
# 2**(8 * 8) / 2 - 1 == 9223372036854775807
# which matches PostgreSQL's `bigint` max value:
# https://www.postgresql.org/docs/current/datatype-numeric.html
def max_integer
((2**(column.limit * 8)) / 2) - 1
end
def min_integer
-2**(column.limit * 8) / 2
end
end
end
end
end
Version data entries
18 entries across 18 versions & 1 rubygems