Merge pull request #221 from fluke777/value_helpers

added value helpers

Author: Tomas Korcak

lib/gooddata/exceptions/attr_element_not_found.rb

@@ -0,0 +1,12 @@
+# encoding: UTF-8
+
+module GoodData
+  # Project Not Found
+  class AttributeElementNotFound < RuntimeError
+    DEFAULT_MSG = 'Attribute element "%s" was not found'
+
+    def initialize(value, msg = DEFAULT_MSG)
+      super(sprintf(DEFAULT_MSG, value))
+    end
+  end
+end

…gooddata/models/metadata/display_form.rb lib/gooddata/models/metadata/label.rblib/gooddata/models/metadata/display_form.rb renamed to lib/gooddata/models/metadata/label.rb lib/gooddata/models/metadata/display_form.rb renamed to lib/gooddata/models/metadata/label.rb

@@ -14,11 +14,11 @@ class Label < GoodData::MdObject
     # @param [String] value value of an label you are looking for
     # @return [String]
     def find_value_uri(value)
-      value = CGI.escape(value)
-      results = GoodData.post("#{uri}/validElements?limit=30&offset=0&order=asc&filter=#{value}", {})
+      escaped_value = CGI.escape(value)
+      results = GoodData.post("#{uri}/validElements?limit=30&offset=0&order=asc&filter=#{escaped_value}", {})
       items = results['validElements']['items']
       if items.empty?
-        fail "#{value} not found"
+        fail(AttributeElementNotFound, value)
       else
         items.first['element']['uri']
       end
@@ -39,6 +39,16 @@ def find_element_value(element_id)
       end
     end
 
+    # Finds if a label has an attribute element for given value.
+    # @param [String] value value of an label you are looking for
+    # @return [Boolean]
+    def value?(value)
+      find_value_uri(value)
+      true
+    rescue AttributeElementNotFound
+      false
+    end
+
     # Returns all values for this label. This is for inspection purposes only since obviously there can be huge number of elements.
     # @param [Hash] options the options to pass to the value list
     # @option options [Number] :limit limits the number of values to certain number. Default is 100

spec/integration/full_project_spec.rb

@@ -282,6 +282,8 @@
       l = attribute.primary_label
       value = l.values.first[:value]
       l.find_element_value(l.find_value_uri(value)).should == value
+      expect(l.value?(value)).should == true
+      expect(l.value?("DEFINITELY NON EXISTENT VALUE HOPEFULLY")).should == false
     end
   end