Class: USA::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/usaspending/base.rb

Direct Known Subclasses

Contract, Procurement

Constant Summary collapse

API_URL = 
"http://www.usaspending.gov"

Instance Method Summary collapse

Instance Method Details

#construct_url(database, params) ⇒ Object

construct the url. Requires a database name, currently FAADS or FPDS



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# File 'lib/usaspending/base.rb', line 7

def construct_url(database, params)
  if database == nil or database == ''
    raise "Failed to provide a Federal Database such as FAADS or FPDS"
  else
    "#{API_URL}/#{database.downcase}/#{database.downcase}.php?datype=X#{hash2get(params)}"
  end
end

#get_data(url) ⇒ Object

Use the Open URI and NokoGiri libraries to make the API call

Usage:

Class::Instance.get_data("http://someurl.com")    # returns Hash of data or nil



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# File 'lib/usaspending/base.rb', line 30

def get_data(url)
  response = Net::HTTP.get_response(URI.parse(url))
  if response.class == Net::HTTPOK
    result =  XmlSimple.xml_in(response.body)
  else
    nil
  end
end

#hash2get(h) ⇒ Object

Converts a hash to a GET string



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# File 'lib/usaspending/base.rb', line 16

def hash2get(h)
  get_string = ""
  h.each_pair do |key, value|
    get_string += "&#{key.to_s}=#{CGI::escape(value.to_s)}"
  end

  get_string

end

#set_instance_methods(params) ⇒ Object

Sets attr_accessor methods for sub classes to keys in xml hashes



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# File 'lib/usaspending/base.rb', line 41

def set_instance_methods(params)
  
  params.each do |key, value|
      instance_variable_set("@#{key.downcase}", value) if self.methods.include? key.downcase and !value.empty?
  end

end