Class: ScraperWiki::API::Matchers::FieldMatcher

Inherits:
DatastoreMatcher show all
Defined in:
lib/scraperwiki-api/matchers.rb

Instance Method Summary collapse

Constructor Details

This class inherits a constructor from ScraperWiki::API::Matchers::CustomMatcher

Instance Method Details

#at(subfield) ⇒ Object 



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# File 'lib/scraperwiki-api/matchers.rb', line 502

def at(subfield)
  @subfield = subfield
  self
end

#blank?(v) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scraperwiki-api/matchers.rb', line 557

def blank?(v)
  v.respond_to?(:empty?) ? v.empty? : !v
end

#failure_description ⇒ Object 



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# File 'lib/scraperwiki-api/matchers.rb', line 561

def failure_description
  if @subfield
    "#{@field}:#{@subfield} values #{failure_predicate}"
  else
    "#{@field} values #{failure_predicate}"
  end
end

#failure_predicate ⇒ Object

Raises:

  • (NotImplementerError) 


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# File 'lib/scraperwiki-api/matchers.rb', line 577

def failure_predicate
  raise NotImplementerError, 'Subclasses must implement this method'
end

#in(field) ⇒ Object 



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# File 'lib/scraperwiki-api/matchers.rb', line 497

def in(field)
  @field = field
  self
end

#matcher(meth) ⇒ Object

Note:

+@subfield+ can be a hash or an array of hashes



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# File 'lib/scraperwiki-api/matchers.rb', line 508

def matcher(meth)
  if @subfield
    items.send(meth) do |item|
      if blank? item[@field]
        meth == :reject
      else
        v = Yajl::Parser.parse item[@field]
        if Hash === v
          if blank? v[@subfield]
            meth == :reject
          else
            match? v[@subfield]
          end
        elsif Array === v
          v.all? do |w|
            if Hash === w
              if blank? w[@subfield]
                meth == :reject
              else
                match? w[@subfield]
              end
            else
              raise NotImplementerError, 'Can only handle subfields that are hashes or arrays of hashes'
            end
          end
        else
          raise NotImplementerError, 'Can only handle subfields that are hashes or arrays of hashes'
        end
      end
    end
  else
    items.send(meth) do |item|
      if blank? item[@field]
        meth == :reject
      else
        match? item[@field]
      end
    end
  end
end

#matches ⇒ Object 



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# File 'lib/scraperwiki-api/matchers.rb', line 549

def matches
  matcher :select
end

#mismatches ⇒ Object 



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# File 'lib/scraperwiki-api/matchers.rb', line 553

def mismatches
  matcher :reject
end

#negative_failure_description ⇒ Object 



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# File 'lib/scraperwiki-api/matchers.rb', line 569

def negative_failure_description
  if @subfield
    "#{@field}:#{@subfield} values #{negative_failure_predicate}"
  else
    "#{@field} values #{negative_failure_predicate}"
  end
end

#negative_failure_predicate ⇒ Object

Raises:

  • (NotImplementerError) 


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# File 'lib/scraperwiki-api/matchers.rb', line 581

def negative_failure_predicate
  raise NotImplementerError, 'Subclasses must implement this method'
end