Fixes bugs on canvas [fixes SCI-1408]

app/models/experiment.rb

@@ -762,7 +762,7 @@ class Experiment < ApplicationRecord
     dg.to_undirected.each_connected_component { |w| workflows <<  w }
 
     # Retrieve maximum allowed module group name
-    max_length = (MyModuleGroup.validators_on(:name).select { |v| v.class == ActiveModel::Validations::LengthValidator }).first.options[:maximum]
+    max_length = Constants::NAME_MAX_LENGTH
     # For each workflow, generate new names
     new_index = 1
     wf_names = []
@@ -797,7 +797,7 @@ class Experiment < ApplicationRecord
     end
 
     # Remove any existing module groups from modules
-    unless MyModuleGroup.destroy_all(:id => group_ids.to_a)
+    unless MyModuleGroup.where(id: group_ids.to_a).destroy_all
       raise ActiveRecord::ActiveRecordError
     end
 

app/models/my_module.rb

@@ -135,10 +135,10 @@ class MyModule < ApplicationRecord
     MyModule.transaction do
       archived = super
       # Unassociate all samples from module.
-      archived = SampleMyModule.destroy_all(:my_module => self) if archived
+      archived = SampleMyModule.where(my_module: self).destroy_all if archived
       # Remove all connection between modules.
-      archived = Connection.delete_all(:input_id => id) if archived
+      archived = Connection.where(input_id: id).delete_all if archived
-      archived = Connection.delete_all(:output_id => id) if archived
+      archived = Connection.where(output_id: id).delete_all if archived
       unless archived
         raise ActiveRecord::Rollback
       end
@@ -285,7 +285,7 @@ class MyModule < ApplicationRecord
       if !final.include?(my_module)
         final << my_module
       end
-      modules.push(*my_module.my_modules.flatten)
+      modules.push(*my_module.my_modules)
     end
     final
   end
@@ -299,7 +299,7 @@ class MyModule < ApplicationRecord
       if !final.include?(my_module)
         final << my_module
       end
-      modules.push(*my_module.my_module_antecessors.flatten)
+      modules.push(*my_module.my_module_antecessors)
     end
     final
   end