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Contents
module Scopes::Dynamic
module_function
# Sample dynamic scope generating from set of products
# generates 0 or (2..scope_limit) scopes for prices, based
# on number of products (uses Math.log, to guess number of scopes)
def price_scopes_for(products, scope_limit=5)
scopes = []
# Price based scopes
all_prices = products.map(&:price).sort
ranges = [Math.log(products.length).floor, scope_limit].max
if ranges >= 2
l = all_prices.length / ranges
scopes << ProductScope.new({
:name => "master_price_lte",
:arguments => [all_prices[l]]
})
(ranges - 2).times do |x|
scopes << ProductScope.new({
:name => "price_between",
:arguments => [
all_prices[l*(x+1)+1],
all_prices[l*(x+2)]
]
})
end
scopes << ProductScope.new({
:name => "master_price_gte",
:arguments => [all_prices[l*(ranges-1)+1]]
})
end
scopes
end
end
Version data entries
18 entries across 18 versions & 2 rubygems