Refactor all the methods into two new services

app/assets/javascripts/repositories/repository_datatable.js.erb

@@ -101,7 +101,7 @@ var RepositoryDatatable = (function(global) {
           $(row).addClass('selected');
         }
       },
-      // Next 2 options are shared with server-side default state
+      // Next 2 options are provided by server-side default state
       // (and get overriden once state load from server kicks in)
       order: <%= Constants::REPOSITORY_TABLE_DEFAULT_STATE[:order][0].to_s %>,
       columns: (function() {

app/controllers/repository_columns_controller.rb

@@ -124,8 +124,9 @@ class RepositoryColumnsController < ApplicationController
     respond_to do |format|
       format.json do
         if @repository_column.destroy
-          RepositoryTableState.update_states_with_removed_column(
-            @del_repository_column,
+          service = RepositoryTableStateColumnUpdateService.new
+          service.update_states_with_removed_column(
+            @del_repository_column.repository,
             params[:repository_column][:column_index]
           )
           render json: {

app/controllers/user_repositories_controller.rb

@@ -2,7 +2,8 @@ class UserRepositoriesController < ApplicationController
   before_action :load_vars
 
   def save_table_state
-    RepositoryTableState.update_state(current_user, @repository, params[:state])
+    service = RepositoryTableStateService.new(current_user, @repository)
+    service.update_state(params[:state])
     respond_to do |format|
       format.json do
         render json: {
@@ -13,14 +14,13 @@ class UserRepositoriesController < ApplicationController
   end
 
   def load_table_state
-    table_state = RepositoryTableState.load_state(current_user,
-                                                  @repository)
-                                      .state
+    service = RepositoryTableStateService.new(current_user, @repository)
+    state = service.load_state.state
     respond_to do |format|
-      if table_state
+      if state
         format.json do
           render json: {
-            state: table_state
+            state: state
           }
         end
       end

app/models/repository_column.rb

@@ -24,7 +24,8 @@ class RepositoryColumn < ApplicationRecord
   scope :list_type, -> { where(data_type: 'RepositoryListValue') }
 
   def update_repository_table_states
-    RepositoryTableState.update_states_with_new_column(self)
+    service = RepositoryTableStateColumnUpdateService.new
+    service.update_states_with_new_column(self)
   end
 
   def importable?

app/models/repository_table_state.rb

@@ -3,98 +3,4 @@ class RepositoryTableState < ApplicationRecord
   belongs_to :repository, inverse_of: :repository_table_states, optional: true
 
   validates :user, :repository, presence: true
-
-  # We're using Constants::REPOSITORY_TABLE_DEFAULT_STATE as a reference for
-  # default table state; this Ruby Hash makes heavy use of Ruby symbols
-  # notation; HOWEVER, the state that is saved on the RepositoryTableState
-  # record, has EVERYTHING (booleans, symbols, keys, ...) saved as Strings.
-
-  def self.load_state(user, repository)
-    state = where(user: user, repository: repository).take
-    if state.blank?
-      state = RepositoryTableState.create_default_state(user, repository)
-    end
-    state
-  end
-
-  def self.update_state(user, repository, state)
-    RepositoryTableState.load_state(user, repository)
-                        .update(state: state)
-  end
-
-  def self.create_default_state(user, repository)
-    # Destroy any state object before recreating a new one
-    RepositoryTableState.where(user: user, repository: repository).destroy
-
-    default_columns_num =
-      Constants::REPOSITORY_TABLE_DEFAULT_STATE[:length]
-
-    # This state should be strings-only
-    state = HashUtil.deep_stringify_keys_and_values(
-      Constants::REPOSITORY_TABLE_DEFAULT_STATE
-    )
-    repository.repository_columns.each_with_index do |_, index|
-      real_index = default_columns_num + index
-      state['columns'][real_index.to_s] =
-        HashUtil.deep_stringify_keys_and_values(
-          Constants::REPOSITORY_TABLE_STATE_CUSTOM_COLUMN_TEMPLATE
-        )
-      state['ColReorder'] << real_index.to_s
-    end
-    state['length'] = state['columns'].length.to_s
-    state['time'] = Time.new.to_i.to_s
-    return RepositoryTableState.create(user: user,
-    repository: repository,
-    state: state)
-  end
-
-  def self.update_states_with_new_column(new_column)
-    RepositoryTableState.where(
-      repository: new_column.repository
-    ).find_each do |table_state|
-      state = table_state.state
-      index = state['columns'].count
-
-      # Add new columns, ColReorder, length entries
-      state['columns'][index.to_s] =
-        HashUtil.deep_stringify_keys_and_values(
-          Constants::REPOSITORY_TABLE_STATE_CUSTOM_COLUMN_TEMPLATE
-        )
-      state['ColReorder'] << index.to_s
-      state['length'] = (index + 1).to_s
-      state['time'] = Time.new.to_i.to_s
-      table_state.save
-    end
-  end
-
-  def self.update_states_with_removed_column(repository, old_column_index)
-    RepositoryTableState.where(
-      repository: repository
-    ).find_each do |table_state|
-      state = table_state.state
-
-      # old_column_index is a String!
-
-      # Remove column from ColReorder, columns, length entries
-      state['columns'].delete(old_column_index)
-      state['columns'].keys.each do |index|
-        if index.to_i > old_column_index.to_i
-          state['columns'][(index.to_i - 1).to_s] =
-            state['columns'].delete(index.to_s)
-        end
-      end
-
-      state['ColReorder'].delete(old_column_index)
-      state['ColReorder'].map! do |index|
-        if index.to_i > old_column_index.to_i
-          (index.to_i - 1).to_s
-        else
-          index
-        end
-      end
-      state['length'] = (state['length'].to_i - 1).to_s
-      state['time'] = Time.new.to_i.to_s
-      table_state.save
-    end
-  end
 end

app/services/repository_datatable_service.rb

@@ -95,8 +95,8 @@ class RepositoryDatatableService
       direction == column_obj[:dir].upcase
     end || 'ASC'
     column_index = column_obj[:column]
-    col_order = RepositoryTableState.load_state(@user, @repository)
-                                    .state['ColReorder']
+    service = RepositoryTableStateService.new(@user, @repository)
+    col_order = service.load_state.state['ColReorder']
     column_id = col_order[column_index].to_i
 
     if sortable_columns[column_id - 1] == 'assigned'

app/services/repository_table_state_column_update_service.rb

@@ -0,0 +1,56 @@
+class RepositoryTableStateColumnUpdateService
+  # We're using Constants::REPOSITORY_TABLE_DEFAULT_STATE as a reference for
+  # default table state; this Ruby Hash makes heavy use of Ruby symbols
+  # notation; HOWEVER, the state that is saved on the RepositoryTableState
+  # record, has EVERYTHING (booleans, symbols, keys, ...) saved as Strings.
+
+  def update_states_with_new_column(new_column)
+    RepositoryTableState.where(
+      repository: new_column.repository
+    ).find_each do |table_state|
+      state = table_state.state
+      index = state['columns'].count
+
+      # Add new columns, ColReorder, length entries
+      state['columns'][index.to_s] =
+        HashUtil.deep_stringify_keys_and_values(
+          Constants::REPOSITORY_TABLE_STATE_CUSTOM_COLUMN_TEMPLATE
+        )
+      state['ColReorder'] << index.to_s
+      state['length'] = (index + 1).to_s
+      state['time'] = Time.new.to_i.to_s
+      table_state.save
+    end
+  end
+
+  def update_states_with_removed_column(repository, old_column_index)
+    RepositoryTableState.where(
+      repository: repository
+    ).find_each do |table_state|
+      state = table_state.state
+
+      # old_column_index is a String!
+
+      # Remove column from ColReorder, columns, length entries
+      state['columns'].delete(old_column_index)
+      state['columns'].keys.each do |index|
+        if index.to_i > old_column_index.to_i
+          state['columns'][(index.to_i - 1).to_s] =
+            state['columns'].delete(index.to_s)
+        end
+      end
+
+      state['ColReorder'].delete(old_column_index)
+      state['ColReorder'].map! do |index|
+        if index.to_i > old_column_index.to_i
+          (index.to_i - 1).to_s
+        else
+          index
+        end
+      end
+      state['length'] = (state['length'].to_i - 1).to_s
+      state['time'] = Time.new.to_i.to_s
+      table_state.save
+    end
+  end
+end

app/services/repository_table_state_service.rb

@@ -0,0 +1,61 @@
+class RepositoryTableStateService
+
+  attr_reader :user, :repository
+
+  def initialize(user, repository)
+    @user = user
+    @repository = repository
+  end
+
+  # We're using Constants::REPOSITORY_TABLE_DEFAULT_STATE as a reference for
+  # default table state; this Ruby Hash makes heavy use of Ruby symbols
+  # notation; HOWEVER, the state that is saved on the RepositoryTableState
+  # record, has EVERYTHING (booleans, symbols, keys, ...) saved as Strings.
+
+  def load_state
+    state = RepositoryTableState.where(user: @user, repository: @repository).take
+    if state.blank?
+      state = self.create_default_state
+    end
+    state
+  end
+
+  def update_state(state)
+    self.load_state
+        .update(state: state)
+  end
+
+  def create_default_state
+    # Destroy any state object before recreating a new one
+    RepositoryTableState.where(user: @user, repository: @repository).destroy_all
+
+    return RepositoryTableState.create(
+      user: @user,
+      repository: @repository,
+      state: generate_default_state
+    )
+  end
+
+  private
+
+  def generate_default_state
+    default_columns_num =
+      Constants::REPOSITORY_TABLE_DEFAULT_STATE[:length]
+
+    # This state should be strings-only
+    state = HashUtil.deep_stringify_keys_and_values(
+      Constants::REPOSITORY_TABLE_DEFAULT_STATE
+    )
+    repository.repository_columns.each_with_index do |_, index|
+      real_index = default_columns_num + index
+      state['columns'][real_index.to_s] =
+        HashUtil.deep_stringify_keys_and_values(
+          Constants::REPOSITORY_TABLE_STATE_CUSTOM_COLUMN_TEMPLATE
+        )
+      state['ColReorder'] << real_index.to_s
+    end
+    state['length'] = state['columns'].length.to_s
+    state['time'] = Time.new.to_i.to_s
+    state
+  end
+end

config/initializers/constants.rb

@@ -846,7 +846,7 @@ class Constants
     time: 0,
     start: 0,
     length: 6,
-    order: { 0 => [[2, 'asc']] }, # Default sorting by 'ID' column
+    order: { 0 => [2, 'asc'] }, # Default sorting by 'ID' column
     search: { search: '',
               smart: true,
               regex: false,