Fix importers with OCC

app/controllers/import/base_controller.rb

@@ -3,19 +3,17 @@ class Import::BaseController < ApplicationController
   private
 
   def get_or_create_namespace
-    existing_namespace = Namespace.find_by_path_or_name(@target_namespace)
-
-    if existing_namespace
-      if existing_namespace.owner == current_user
-        namespace = existing_namespace
-      else
+    begin
+      namespace = Group.create!(name: @target_namespace, path: @target_namespace, owner: current_user)
+      namespace.add_owner(current_user)
+    rescue ActiveRecord::RecordNotUnique, ActiveRecord::RecordInvalid
+      namespace = Namespace.find_by_path_or_name(@target_namespace)
+      unless namespace.owner == current_user
         @already_been_taken = true
         return false
       end
-    else
-      namespace = Group.create(name: @target_namespace, path: @target_namespace, owner: current_user)
-      namespace.add_owner(current_user)
-      namespace
     end
+
+    namespace
   end
 end

db/migrate/20150306023112_add_unique_index_to_namespace.rb

+class AddUniqueIndexToNamespace < ActiveRecord::Migration
+  def change
+    remove_index :namespaces, :name
+    remove_index :namespaces, :path
+
+    add_index :namespaces, :name, unique: true
+    add_index :namespaces, :path, unique: true
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150225065047) do
+ActiveRecord::Schema.define(version: 20150306023112) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -242,9 +242,9 @@ ActiveRecord::Schema.define(version: 20150225065047) do
   end
 
   add_index "namespaces", ["created_at", "id"], name: "index_namespaces_on_created_at_and_id", using: :btree
-  add_index "namespaces", ["name"], name: "index_namespaces_on_name", using: :btree
+  add_index "namespaces", ["name"], name: "index_namespaces_on_name", unique: true, using: :btree
   add_index "namespaces", ["owner_id"], name: "index_namespaces_on_owner_id", using: :btree
-  add_index "namespaces", ["path"], name: "index_namespaces_on_path", using: :btree
+  add_index "namespaces", ["path"], name: "index_namespaces_on_path", unique: true, using: :btree
   add_index "namespaces", ["type"], name: "index_namespaces_on_type", using: :btree
 
   create_table "notes", force: true do |t|
@@ -334,12 +334,12 @@ ActiveRecord::Schema.define(version: 20150225065047) do
     t.string   "import_url"
     t.integer  "visibility_level",       default: 0,        null: false
     t.boolean  "archived",               default: false,    null: false
-    t.string   "avatar"
     t.string   "import_status"
     t.float    "repository_size",        default: 0.0
     t.integer  "star_count",             default: 0,        null: false
     t.string   "import_type"
     t.string   "import_source"
+    t.string   "avatar"
   end
 
   add_index "projects", ["created_at", "id"], name: "index_projects_on_created_at_and_id", using: :btree