Class: InstantApi::Model::AssociationReflector

Inherits:
Object
  • Object
show all
Defined in:
lib/instant_api/model/association_reflector.rb

Instance Method Summary collapse

Constructor Details

#initialize(association_list) ⇒ AssociationReflector

Returns a new instance of AssociationReflector.



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# File 'lib/instant_api/model/association_reflector.rb', line 25

def initialize(association_list)
  @association_list = association_list
end

Instance Method Details

#association(klass, name) ⇒ Object 



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# File 'lib/instant_api/model/association_reflector.rb', line 84

def association(klass, name)
  klass.reflect_on_association(name.to_s.singularize.to_sym) ||
      klass.reflect_on_association(name.to_s.pluralize.to_sym)
end

#calculate_conditions(params) ⇒ Object 



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# File 'lib/instant_api/model/association_reflector.rb', line 52

def calculate_conditions(params)
  result = Hash.new
  result[:id] = params[:id] if params[:id]

  resource, *rest = *params.resources
  klass = to_class(resource)
  rest.map do |association_name|
    if (assoc = association(klass, association_name))
      table = join_table(assoc)
      foreign_key = foreign_key(assoc)
      result[table] = { foreign_key => params[foreign_key] }
    end

    resource = association_name
    klass = to_class(resource)
  end

  result
end

#calculate_join ⇒ Object 



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# File 'lib/instant_api/model/association_reflector.rb', line 29

def calculate_join
  *associations, resource = *@association_list
  klass = to_class(resource)
  first, *rest = *associations.reverse

  result = []
  if (assoc = association(klass, first))
    result << assoc.name.to_sym
    klass = to_class(first)
  end

  if rest
    rest.each do |association_name|
      if (assoc = association(klass, association_name))
        result << {klass.name.downcase.to_sym => assoc.name.to_sym}
        klass = to_class(association_name)
      end
    end
  end

  result
end

#foreign_key(assoc) ⇒ Object 



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# File 'lib/instant_api/model/association_reflector.rb', line 80

def foreign_key(assoc)
  assoc.foreign_key.to_sym
end

#join_table(assoc) ⇒ Object 



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# File 'lib/instant_api/model/association_reflector.rb', line 72

def join_table(assoc)
  if assoc.has_and_belongs_to_many?
    assoc.join_table.to_sym
  else
    assoc.name.to_sym
  end
end

#to_class(symbol) ⇒ Object 



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# File 'lib/instant_api/model/association_reflector.rb', line 89

def to_class(symbol)
  symbol.to_s.classify.constantize
end