Module: Alf::Rest::Helpers

Extended by:
Forwardable
Defined in:
lib/alf/rest/helpers.rb

Instance Method Summary collapse

Instance Method Details

#alf_config ⇒ Object 



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# File 'lib/alf/rest/helpers.rb', line 6

def alf_config
  env[Rest::RACK_CONFIG_KEY]
end

#assert!(msg = 'an assertion failed', status = nil, &bl) ⇒ Object 



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# File 'lib/alf/rest/helpers.rb', line 33

def assert!(msg='an assertion failed', status=nil, &bl)
  db_conn.assert!(msg, &bl)
rescue FactAssertionError => ex
  ex.http_error_status = status
  raise
end

#db_conn ⇒ Object 



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# File 'lib/alf/rest/helpers.rb', line 10

def db_conn
  alf_config.connection
end

#deny!(msg = 'an assertion failed', status = nil, &bl) ⇒ Object 



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# File 'lib/alf/rest/helpers.rb', line 40

def deny!(msg='an assertion failed', status=nil, &bl)
  db_conn.deny!(msg, &bl)
rescue FactAssertionError => ex
  ex.http_error_status = status
  raise
end

#fact!(msg = 'an assertion failed', status = nil, &bl) ⇒ Object 



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# File 'lib/alf/rest/helpers.rb', line 47

def fact!(msg='an assertion failed', status=nil, &bl)
  db_conn.fact!(msg, &bl)
rescue FactAssertionError => ex
  ex.http_error_status = status
  raise
end

#location_set? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/alf/rest/helpers.rb', line 29

def location_set?
  response.headers["Location"]
end

#no_duplicate!(&bl) ⇒ Object 



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# File 'lib/alf/rest/helpers.rb', line 54

def no_duplicate!(&bl)
  found = relvar(&bl)
  unless found.empty?
    ids = found.project(found.keys.first.to_attr_list)
    halt Alf::Rest::Response.new(env){|r|
      r.status = 200
      r.body = {'status' => 'success', 'message' => 'skipped'}
      r["Location"] = to_location(request.path, ids)
    }.finish
  end
end

#to_location(url, ids) ⇒ Object 



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# File 'lib/alf/rest/helpers.rb', line 22

def to_location(url, ids)
  ids = ids.matching_relation if ids.respond_to?(:matching_relation)
  ids = ids.tuple_extract     if ids.respond_to?(:tuple_extract)
  ids = ids.to_hash.values
  "#{url}/#{ids.join(',')}"
end

#with_db_conn {|db_conn| ... } ⇒ Object

Yields:



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# File 'lib/alf/rest/helpers.rb', line 14

def with_db_conn
  yield(db_conn)
end