Added method remove_all_data to the StudyRelationship class inorder t…

…o delete all the data from study models.

app/models/study_relationship.rb

@@ -42,6 +42,12 @@ def self.study_models
     @models = (connection.tables - blacklist).map{|k| k.singularize.camelize.constantize }
   end
 
+  def self.remove_all_data
+    study_models.each do |model|
+      model.delete_all
+    end
+  end
+
   def self.create_nct_indexes
     blacklist = %w(
       ar_internal_metadata

spec/models/utils/util_table_exporter_spec.rb

@@ -9,7 +9,7 @@
       # this study has new line chars embedded in Outcomes.description.  Will verify they don't cause probs in flat files
       db = Util::DbManager.new
       db.remove_indexes_and_constraints
-      Study.destroy_all
+      StudyRelationship.remove_all_data
       record = StudyJsonRecord.create(nct_id: 'NCT05594173', content: JSON.parse(File.read('spec/support/json_data/NCT05594173.json')))
       record.create_or_update_study
       db.add_indexes