Class: Graphiti::Stats::Payload

Inherits:
Object
  • Object
show all
Defined in:
lib/graphiti/stats/payload.rb

Overview

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 } } }
}

Instance Method Summary collapse

Constructor Details

#initialize(resource, query, scope, data, group_by: nil) ⇒ Payload

Returns a new instance of Payload.



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# File 'lib/graphiti/stats/payload.rb', line 17

def initialize(resource, query, scope, data, group_by: nil)
  @resource = resource
  @query = query
  @scope = scope
  @data = data
  @group_by = group_by
end

Instance Method Details

#calculate_stat(name, function) ⇒ Object 



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# File 'lib/graphiti/stats/payload.rb', line 41

def calculate_stat(name, function)
  args = [@scope, @resource.model_attribute_for(name)]
  args << @resource.context if function.arity >= 3
  args << @data if function.arity == 4
  translate_group_keys(function.call(*args))
end

#generate ⇒ Hash

Generate the payload for { meta: { stats: { ... } } } Loops over all calculations, computes then, and gives back a hash of stats and their results.

Returns:

  • (Hash) —

    the generated payload



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# File 'lib/graphiti/stats/payload.rb', line 29

def generate
  {}.tap do |stats|
    @query.stats.each_pair do |name, calculation|
      stats[name] = {}

      each_calculation(name, calculation) do |calc, function|
        stats[name][calc] = calculate_stat(name, function)
      end
    end
  end
end