Implement transaction category management (#688)

* Singularize "transaction" in transaction-nested paths

* Refactor category badge partial

* Let modal content define its width

* Add contectual menu to transactions index

* Add null_category helper

* Implement category edits

* Fix inline transaction category badges

* Fix typos in system test paths

* Add missing translations

* Add decoration to color select controller

* Wire up transaction category creation

* Fix indent in color-select-controller

* Add button for clearing category from transaction

* Implement category deletions

* Fix existing modal sizes

* Use null_category in a single place

* Remove anemic method in category deletion controller

* reassign_and_destroy -> reassign_transactions_then_destroy

* Fix i18n

* Remove destroy action from CategoriesController callbacks

* transactions_merchant -> transaction_merchant

* reassign_transactions_then_destroy -> replace_and_destroy

* Add transaction category CRUD tests

* Add presence check for transaction_id

* Check replacement_category_id presence

* Test Transaction::Category#replace_and_destroy!

config/locales/views/transaction/en.yml

@@ -3,12 +3,40 @@ en:
   transactions:
     categories:
       create:
-        error: Error creating transaction category
         success: New transaction category created successfully
-      destroy:
-        success: Transaction category deleted successfully
+      deletions:
+        create:
+          success: Transaction category deleted successfully
+        new:
+          category: Category
+          delete_and_leave_uncategorized: Delete "%{category_name}" and leave uncategorized
+          delete_and_recategorize: Delete "%{category_name}" and assign new category
+          delete_category: Delete category?
+          explanation: By deleting this category, every transaction that has the "%{category_name}"
+            category will be uncategorized. Instead of leaving them uncategorized,
+            you can also assign a new category below.
+          replacement_category_prompt: Select category
+      dropdown:
+        row:
+          delete: Delete category
+          edit: Edit category
+      edit:
+        edit: Edit category
+      form:
+        create: Create category
+        update: Update
+      index:
+        categories: Categories
+        new: New
+      menu:
+        add_new: Add new
+        clear: Clear
+      new:
+        new_category: New category
+      row:
+        delete: Delete category
+        edit: Edit category
       update:
-        error: Error updating transaction category
         success: Transaction category updated successfully
     create:
       success: New transaction created successfully
@@ -27,6 +55,8 @@ en:
       income: Income
       submit: Add transaction
       transfer: Transfer
+    index:
+      edit_categories: Edit categories
     merchants:
       create:
         error: Error creating merchant

config/routes.rb

@@ -21,17 +21,19 @@ Rails.application.routes.draw do
     resource :security, only: %i[show update]
   end
 
-  namespace :transactions do
-    resources :categories
-
-    # TODO: These are *placeholders*
-    # Uncomment `only` and add the necessary actions as they are implemented.
-    resources :rules, only: [ :index ]
-    resources :merchants, only: %i[index new create edit update destroy]
-  end
-
   resources :transactions do
     match "search" => "transactions#search", on: :collection, via: [ :get, :post ], as: :search
+
+    collection do
+      scope module: :transactions do
+        resources :categories, as: :transaction_categories do
+          resources :deletions, only: %i[ new create ], module: :categories
+        end
+
+        resources :rules, only: %i[ index ], as: :transaction_rules
+        resources :merchants, only: %i[ index new create edit update destroy ], as: :transaction_merchants
+      end
+    end
   end
 
   resources :accounts, shallow: true do