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Contents
module JsonapiCompliable
module Stats
# Generate the stats payload so we can return it in the response.
#
# {
# data: [...],
# meta: { stats: the_generated_payload }
# }
#
# For example:
#
# {
# data: [...],
# meta: { stats: { total: { count: 100 } } }
# }
class Payload
# @param [Resource] resource the resource instance
# @param [Hash] query_hash the Query#to_hash for the current resource
# @param scope the scope we are chaining/modifying
def initialize(resource, query_hash, scope)
@resource = resource
@query_hash = query_hash[:stats]
@scope = scope
end
# Generate the payload for +{ meta: { stats: { ... } } }+
# Loops over all calculations, computes then, and gives back
# a hash of stats and their results.
# @return [Hash] the generated payload
def generate
{}.tap do |stats|
@query_hash.each_pair do |name, calculation|
stats[name] = {}
each_calculation(name, calculation) do |calc, function|
args = function.arity == 3 ? [@scope, name, @resource] : [@scope, name]
stats[name][calc] = function.call(*args)
end
end
end
end
private
def each_calculation(name, calculations)
calculations.each do |calc|
function = @resource.stat(name, calc)
yield calc, function
end
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems