Added MeasurementRoutine as a nested Measurement model

Updated ItemsWithQuantities to work with MeasurementRoutine
Replaced ColumnViews HABTM with polymorphic HMT
Added Measurement notes
Added destroy restrictions on Quantity
Replaced BodyTrackingPluginController with Finders concern
Removed 'body_trackers' prefix from paths
Unified styling for textarea

app/controllers/body_trackers_controller.rb

@@ -1,4 +1,7 @@
-class BodyTrackersController < BodyTrackingPluginController
+class BodyTrackersController < ApplicationController
+  layout 'body_tracking'
+  menu_item :body_trackers
+
   before_action :find_project_by_project_id, only: [:index, :defaults]
   before_action :authorize
 
@@ -43,10 +46,8 @@ class BodyTrackersController < BodyTrackingPluginController
     flash[:notice] += ", #{new_quantities_count > 0 ? new_quantities_count : "no" } new" \
       " #{'quantity'.pluralize(new_quantities_count)}"
 
-    ncv = @project.nutrients_column_view
-    if ncv.quantities.count == 0
-      ncv.quantities.append(@project.quantities.roots.first(6))
-      ncv.save!
+    if @project.nutrient_quantities.empty?
+      @project.nutrient_quantities << @project.quantities.diet.roots.first(6)
     end
 
     # Sources

app/controllers/body_tracking_plugin_controller.rb

@@ -1,17 +0,0 @@
-class BodyTrackingPluginController < ApplicationController
-  menu_item :body_trackers
-  layout 'body_tracking'
-
-  private
-
-  def find_quantity(id = :id)
-    @quantity = Quantity.find(params[id])
-    @project = @quantity.project
-  rescue ActiveRecord::RecordNotFound
-    render_404
-  end
-
-  def find_quantity_by_quantity_id
-    find_quantity(:quantity_id)
-  end
-end

app/controllers/concerns/finders.rb

@@ -0,0 +1,42 @@
+module Concerns::Finders
+  private
+
+  def find_ingredient
+    @ingredient = Ingredient.find(params[:id])
+    @project = @ingredient.project
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_measurement
+    @measurement = Measurement.find(params[:id])
+    @project = @measurement.routine.project
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_measurement_routine
+    @routine = MeasurementRoutine.find(params[:id])
+    @project = @routine.project
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_quantity(id = :id)
+    @quantity = Quantity.find(params[id])
+    @project = @quantity.project
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_quantity_by_quantity_id
+    find_quantity(:quantity_id)
+  end
+
+  def find_unit
+    @unit = Unit.find(params[:id])
+    @project = @unit.project
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+end

app/controllers/ingredients_controller.rb

@@ -1,9 +1,13 @@
-class IngredientsController < BodyTrackingPluginController
+class IngredientsController < ApplicationController
   require 'csv'
 
+  layout 'body_tracking'
+  menu_item :body_trackers
   helper :body_trackers
   helper_method :current_view
 
+  include Concerns::Finders
+
   before_action :init_session_filters
   before_action :find_project_by_project_id,
     only: [:index, :new, :create, :nutrients, :filter, :import]
@@ -63,7 +67,7 @@ class IngredientsController < BodyTrackingPluginController
   end
 
   def toggle_column
-    @project.nutrients_column_view.toggle_column!(@quantity)
+    @project.nutrient_columns.toggle!(@quantity)
     prepare_items
     render :index
   end
@@ -201,15 +205,6 @@ class IngredientsController < BodyTrackingPluginController
     )
   end
 
-  # :find_* methods are called before :authorize,
-  # @project is required for :authorize to succeed
-  def find_ingredient
-    @ingredient = Ingredient.find(params[:id])
-    @project = @ingredient.project
-  rescue ActiveRecord::RecordNotFound
-    render_404
-  end
-
   def prepare_ingredients
     @ingredients, @formula_q = @project.ingredients
       .includes(:ref_unit, :source)
@@ -217,7 +212,7 @@ class IngredientsController < BodyTrackingPluginController
   end
 
   def prepare_nutrients
-    @quantities = @project.nutrients_column_view.quantities.includes(:formula)
+    @quantities = @project.nutrient_quantities.includes(:formula)
     @ingredients, @requested_n, @extra_n, @formula_q = @project.ingredients
       .filter(session[:i_filters], @quantities)
   end

app/controllers/measurements_controller.rb

@@ -1,11 +1,15 @@
-class MeasurementsController < BodyTrackingPluginController
+class MeasurementsController < ApplicationController
+  layout 'body_tracking'
+  menu_item :body_trackers
   helper :body_trackers
 
+  include Concerns::Finders
+
   before_action :init_session_filters
   before_action :find_project_by_project_id, only: [:index, :new, :create, :filter]
   before_action :find_quantity_by_quantity_id, only: [:toggle_column]
-  before_action :find_measurement,
-    only: [:edit, :update, :destroy, :retake, :readouts, :toggle_column]
+  before_action :find_measurement, only: [:edit, :update, :destroy, :retake]
+  before_action :find_measurement_routine, only: [:readouts, :toggle_column]
   before_action :authorize
 
   def index
@@ -15,12 +19,18 @@ class MeasurementsController < BodyTrackingPluginController
 
   def new
     @measurement = @project.measurements.new
+    @measurement.build_routine
     @measurement.readouts.new
   end
 
   def create
     @measurement = @project.measurements.new(measurement_params)
+    @measurement.routine.project = @project
     if @measurement.save
+      if @measurement.routine.columns.empty?
+        @measurement.routine.quantities << @measurement.readouts.map(&:quantity).first(6)
+      end
+
       flash[:notice] = 'Created new measurement'
       readouts_view? ? prepare_readouts : prepare_measurements
     else
@@ -58,12 +68,12 @@ class MeasurementsController < BodyTrackingPluginController
   end
 
   def readouts
-    session[:m_filters][:scope] = {name: @measurement.name}
+    #session[:m_filters][:scope] = {routine: @routine}
     prepare_readouts
   end
 
   def toggle_column
-    @measurement.column_view.toggle_column!(@quantity)
+    @routine.columns.toggle!(@quantity)
     prepare_readouts
     render :index
   end
@@ -82,8 +92,13 @@ class MeasurementsController < BodyTrackingPluginController
 
   def measurement_params
     params.require(:measurement).permit(
-      :name,
+      :notes,
       :source_id,
+      routine_attributes:
+      [
+        :name,
+        :description
+      ],
       readouts_attributes:
       [
         :id,
@@ -95,30 +110,17 @@ class MeasurementsController < BodyTrackingPluginController
     )
   end
 
-  # :find_* methods are called before :authorize,
-  # @project is required for :authorize to succeed
-  def find_measurement
-    @measurement = Measurement.find(params[:id])
-    @project = @measurement.project
-  rescue ActiveRecord::RecordNotFound
-    render_404
-  end
-
   def prepare_measurements
     @measurements, @formula_q = @project.measurements
-      .includes(:source, :readouts)
+      .includes(:routine, :source, :readouts)
       .filter(session[:m_filters])
   end
 
   def prepare_readouts
-    @scoping_measurement = @project.measurements.where(session[:m_filters][:scope]).first!
-    @quantities = @scoping_measurement.column_view.quantities.includes(:formula)
-    @measurements, @requested_r, @extra_r, @formula_q = @project.measurements
-      .includes(:source)
+    @quantities = @routine.quantities.includes(:formula)
+    @measurements, @requested_r, @extra_r, @formula_q = @routine.measurements
+      .includes(:routine, :source)
       .filter(session[:m_filters], @quantities)
-  rescue ActiveRecord::RecordNotFound
-    session[:m_filters][:scope] = {}
-    render_404
   end
 
   def readouts_view?

app/controllers/quantities_controller.rb

@@ -1,6 +1,10 @@
-class QuantitiesController < BodyTrackingPluginController
+class QuantitiesController < ApplicationController
+  layout 'body_tracking'
+  menu_item :body_trackers
   helper :body_trackers
 
+  include Concerns::Finders
+
   before_action :init_session_filters
   before_action :find_project_by_project_id, only: [:index, :new, :create, :filter, :parents]
   before_action :find_quantity, only: [:edit, :update, :destroy, :move,
@@ -118,6 +122,6 @@ class QuantitiesController < BodyTrackingPluginController
 
   def prepare_quantities
     @quantities = @project.quantities.filter(@project, session[:q_filters])
-      .includes(:column_views, :formula, :parent)
+      .includes(:columns, :formula, :parent)
   end
 end

app/controllers/sources_controller.rb

@@ -1,4 +1,7 @@
-class SourcesController < BodyTrackingPluginController
+class SourcesController < ApplicationController
+  layout 'body_tracking'
+  menu_item :body_trackers
+
   before_action :find_project_by_project_id, only: [:index, :create]
   before_action :find_source, only: [:destroy]
   before_action :authorize

app/controllers/units_controller.rb

@@ -1,4 +1,9 @@
-class UnitsController < BodyTrackingPluginController
+class UnitsController < ApplicationController
+  layout 'body_tracking'
+  menu_item :body_trackers
+
+  include Concerns::Finders
+
   before_action :find_project_by_project_id, only: [:index, :create]
   before_action :find_unit, only: [:destroy]
   before_action :authorize
@@ -34,13 +39,4 @@ class UnitsController < BodyTrackingPluginController
       :shortname
     )
   end
-
-  # :find_* methods are called before :authorize,
-  # @project is required for :authorize to succeed
-  def find_unit
-    @unit = Unit.find(params[:id])
-    @project = @unit.project
-  rescue ActiveRecord::RecordNotFound
-    render_404
-  end
 end

app/helpers/ingredients_helper.rb

@@ -7,9 +7,9 @@ module IngredientsHelper
 
   def toggle_column_options
     disabled = []
-    enabled_columns = @project.nutrients_column_view.quantities.to_a
+    enabled_quantities = @project.nutrient_quantities.to_a
     options = nested_set_options(@project.quantities.diet) do |q|
-      disabled << q.id if enabled_columns.include?(q)
+      disabled << q.id if enabled_quantities.include?(q)
       raw("#{'&ensp;' * q.level}#{q.name}")
     end
     options_for_select(options, disabled: disabled)

app/helpers/measurements_helper.rb

@@ -11,9 +11,9 @@ module MeasurementsHelper
 
   def toggle_column_options
     disabled = []
-    enabled_columns = @scoping_measurement.column_view.quantities
+    enabled_quantities = @routine.quantities.to_a
     options = nested_set_options(@project.quantities.measurement) do |q|
-      disabled << q.id if enabled_columns.include?(q)
+      disabled << q.id if enabled_quantities.include?(q)
       raw("#{'&ensp;' * q.level}#{q.name}")
     end
     options_for_select(options, disabled: disabled)

app/models/column.rb

@@ -0,0 +1,4 @@
+class Column < ActiveRecord::Base
+  belongs_to :column_view, polymorphic: true
+  belongs_to :quantity
+end

app/models/column_view.rb

@@ -1,19 +0,0 @@
-class ColumnView < ActiveRecord::Base
-  enum domain: Quantity.domains
-
-  belongs_to :project, required: true
-  has_and_belongs_to_many :quantities, -> { order "lft" }
-
-  validates :name, presence: true, uniqueness: {scope: :domain}
-  validates :domain, inclusion: {in: domains.keys}
-
-  # TODO: enforce column_view - quantity 'domain' identity
-  def toggle_column!(q)
-    column = self.quantities.find(q.id)
-    self.quantities.destroy(column)
-  rescue ActiveRecord::RecordNotFound
-    # Cannot 'create' association, as ColumnView (parent) may not be saved yet
-    self.quantities.append(q)
-    self.save!
-  end
-end

app/models/measurement.rb

@@ -1,5 +1,11 @@
 class Measurement < ActiveRecord::Base
-  belongs_to :project, required: true
+  belongs_to :routine, required: true, inverse_of: :measurements,
+    class_name: 'MeasurementRoutine'
+  accepts_nested_attributes_for :routine, allow_destroy: true, reject_if: proc { |attrs|
+    attrs['name'].blank?
+  }
+  after_destroy { self.routine.destroy if self.routine.measurements.empty? }
+
   belongs_to :source, required: false
 
   has_many :readouts, inverse_of: :measurement, dependent: :destroy, validate: true
@@ -17,7 +23,6 @@ class Measurement < ActiveRecord::Base
     end
   end
 
-  validates :name, presence: true
   validates :taken_at, presence: true
 
   after_initialize do
@@ -26,21 +31,6 @@ class Measurement < ActiveRecord::Base
     end
   end
 
-  after_create :seed_column_view, if: -> {self.column_view.quantities.count == 0}
-  after_save :cleanup_column_view, if: :name_changed?
-
-  # Destroy ColumnView after last Measurement destruction
-  after_destroy do
-    unless self.project.measurements.exists?(name: self.name)
-      self.column_view.destroy!
-    end
-  end
-
-  def column_view
-    self.project.column_views
-      .find_or_create_by(name: self.name, domain: ColumnView.domains[:measurement])
-  end
-
   def taken_at_date
     self.taken_at.getlocal
   end
@@ -54,27 +44,4 @@ class Measurement < ActiveRecord::Base
   def taken_at_time=(value)
     self.taken_at = Time.parse(value, self.taken_at)
   end
-
-  private
-
-  def seed_column_view
-    quantities = self.project.quantities.joins(:readouts).includes(readouts: [:measurement])
-      .where(measurements: {name: self.name}).first(6)
-    self.column_view.quantities.append(quantities)
-    self.column_view.save!
-  end
-
-  # Copy/rename ColumnView on Measurement rename
-  def cleanup_column_view
-    old_column_view = self.project.column_views
-      .find_by(name: self.name_was, domain: ColumnView.domains[:measurement])
-    return unless old_column_view
-
-    if self.project.measurements.exists?(name: self.name_was)
-      self.column_view.quantities.append(old_column_view.quantities)
-      self.column_view.save!
-    else
-      old_column_view.update!(name: self.name)
-    end
-  end
 end

app/models/measurement_routine.rb

@@ -0,0 +1,11 @@
+class MeasurementRoutine < ActiveRecord::Base
+  belongs_to :project, required: true
+  has_many :measurements, -> { order "taken_at DESC" }, inverse_of: :routine,
+    foreign_key: 'routine_id', dependent: :restrict_with_error,
+    extend: BodyTracking::ItemsWithQuantities
+  has_many :columns, as: :column_view, dependent: :destroy,
+    extend: BodyTracking::TogglableColumns
+  has_many :quantities, -> { order "lft" }, through: :columns
+
+  validates :name, presence: true, uniqueness: {scope: :project_id}
+end

app/models/quantity.rb

@@ -5,16 +5,11 @@ class Quantity < ActiveRecord::Base
     exercise: 2
   }
 
-  # Has to go before any 'dependent:' association
-  before_destroy do
-    # FIXME: disallow destruction if any object depends on this quantity
-    nil
-  end
-
   acts_as_nested_set dependent: :destroy, scope: :project
   belongs_to :project, required: false
-  has_and_belongs_to_many :column_views
-  has_many :readouts
+  has_many :nutrients, dependent: :restrict_with_error
+  has_many :readouts, dependent: :restrict_with_error
+  has_many :columns, dependent: :destroy
 
   has_one :formula, inverse_of: :quantity, dependent: :destroy, validate: true
   accepts_nested_attributes_for :formula, allow_destroy: true, reject_if: proc { |attrs|

app/views/measurements/_form.html.erb

@@ -1,9 +1,21 @@
 <%= error_messages_for @measurement %>
 
-<div class="box tabular">
+<fieldset class="box">
+  <legend ><%= t('.label_routine') %></legend>
+  <div class="tabular">
+    <%= f.fields_for :routine do |ff| %>
+      <p><%= ff.text_field :name, required: true, style: "width: 95%;" %></p>
+      <p><%= ff.text_area :description, cols: 40, rows: 3, style: "width: 95%;" %></p>
+    <% end %>
+  </div>
+</fieldset>
+
+<fieldset class="box">
+  <legend ><%= t('.label_measurement') %></legend>
+  <div class="tabular">
     <p><%= f.select :source_id, source_options,
       {required: false, include_blank: t('.null_source')} %></p>
-  <p><%= f.text_field :name, size: 40, required: true %></p>
+    <p><%= f.text_area :notes, cols: 40, rows: 1, style: "width: 95%;" %></p>
     <p>
     <%= f.date_field :taken_at_date, required: true %>
     <%= f.time_field :taken_at_time, value: format_time(@measurement), required: true,
@@ -29,7 +41,8 @@
     <%= link_to t(".button_new_readout"), '#', class: 'icon icon-add',
       onclick: 'newReadout(); return false;' %>
     </p>
-</div>
+  </div>
+</fieldset>
 
 <%= javascript_tag do %>
   function newReadout() {

app/views/measurements/_index.html.erb

@@ -20,7 +20,7 @@
           <td class="date unwrappable"><%= format_datetime(m) %></td>
           <td class="name">
             <div style="float:left;">
-              <%= link_to m.name, readouts_measurement_path(m) %>
+              <%= link_to m.routine.name, readouts_measurement_routine_path(m.routine) %>
             </div>
             <div style="float:right;">
               <small><%= " (#{pluralize(m.readouts.size, 'readout')})" %></small>

app/views/measurements/_options.html.erb

@@ -1,7 +1,7 @@
 <fieldset id="options" class="collapsible">
   <legend onclick="toggleFieldset(this);"><%= l(:label_options) %></legend>
   <div>
-    <%= form_tag toggle_column_measurement_path(@scoping_measurement),
+    <%= form_tag toggle_column_measurement_routine_path(@routine),
       id: 'toggle-column-form', name: 'toggle-column-form',
       method: :post, remote: true do %>
 

app/views/measurements/_readouts.html.erb

@@ -17,7 +17,7 @@
           <th style="width:<%= 100/total_width %>%" class="closable ellipsible">
             <div style="float:right;position:relative;">
               <%= link_to '',
-                toggle_column_measurement_path(@scoping_measurement, quantity_id: q.id),
+                toggle_column_measurement_routine_path(@routine, quantity_id: q.id),
                 {class: "icon icon-close", method: :post, remote: true} %>
             </div>
             <%= q.name %>

app/views/measurements/readouts.html.erb

@@ -8,7 +8,7 @@
 <h2>
   <%= link_to t("measurements.index.heading"), project_measurements_path(@project) %>
   >
-  <%= @measurements.first.name %>
+  <%= @routine.name %>
 </h2>
 <div id='readouts'>
   <%= render partial: 'measurements/readouts' %>

app/views/quantities/_index.html.erb

@@ -18,12 +18,12 @@
         <%
           next if q.new_record?
           quantity_class = "quantity"
-          quantity_class += " primary" unless q.column_views.empty?
+          quantity_class += " primary" unless q.columns.empty?
           quantity_class += " project idnt idnt-#{level+1}"
         %>
         <tr id="quantity-<%= q.id %>" class="<%= quantity_class %>">
           <td class="name unwrappable">
-            <div class="icon <%= q.column_views.empty? ? 'icon-fav-off' : 'icon-fav' %>">
+            <div class="icon <%= q.columns.empty? ? 'icon-fav-off' : 'icon-fav' %>">
               <%= q.name %>
             </div>
           </td>

assets/stylesheets/body_tracking.css

@@ -37,7 +37,7 @@ input[type=number] {
   -moz-appearance:textfield;
   text-align: right;
 }
-input[type=date], input[type=time], input[type=number] {
-  border:1px solid #9EB1C2;
+input[type=date], input[type=time], input[type=number], textarea {
+  border:1px solid #d7d7d7;
   padding: 3px;
 }

config/locales/en.yml

@@ -68,6 +68,8 @@ en:
     filters:
       zero_nil: 'missing -> 0?'
     form:
+      label_routine: 'Measurement routine (shared among all measurements of this kind)'
+      label_measurement: 'Measurement'
       button_new_readout: 'Add readout'
       button_delete_readout: 'Delete'
       null_source: '- unspecified -'

config/routes.rb

@@ -5,11 +5,17 @@ resources :projects, shallow: true do
   resources :body_trackers, only: [:index] do
     collection do
       post 'defaults'
+    end
+  end
+  resources :measurement_routines, only: [] do
+    member do
+      get 'readouts', to: 'measurements#readouts'
+      post 'toggle_column', to: 'measurements#toggle_column'
+    end
+  end
   resources :measurements, only: [:index, :new, :create, :edit, :update, :destroy] do
     member do
       get 'retake'
-          get 'readouts'
-          post 'toggle_column'
     end
     collection do
       get 'filter'
@@ -37,6 +43,4 @@ resources :projects, shallow: true do
     end
   end
   resources :units, only: [:index, :create, :destroy]
-    end
-  end
 end

db/migrate/001_create_schema.rb

@@ -27,14 +27,8 @@ class CreateSchema < ActiveRecord::Migration
       t.timestamps null: false
     end
 
-    create_table :column_views do |t|
-      t.references :project
-      t.string :name
-      t.integer :domain
-    end
-
-    create_table :column_views_quantities do |t|
-      t.references :column_view
+    create_table :columns do |t|
+      t.references :column_view, polymorphic: true
       t.references :quantity
     end
 
@@ -66,10 +60,17 @@ class CreateSchema < ActiveRecord::Migration
       t.timestamps null: false
     end
 
-    create_table :measurements do |t|
+    create_table :measurement_routines do |t|
       t.references :project
       t.string :name
+      t.text :description
+      t.timestamps null: false
+    end
+
+    create_table :measurements do |t|
+      t.references :routine
       t.references :source
+      t.text :notes
       t.timestamp :taken_at
       t.timestamps null: false
     end

lib/body_tracking/items_with_quantities.rb

@@ -1,12 +1,18 @@
 module BodyTracking
   module ItemsWithQuantities
-    QUANTITY_DOMAINS = {
-      Measurement => :measurement,
-      Ingredient => :diet
+    RELATIONS = {
+      'Ingredient' => {
+        domain: :diet,
+        foreign_key: :ingredient_id,
+        subitem_class: Nutrient,
+        value_field: :amount
+      },
+      'Measurement' => {
+        domain: :measurement,
+        foreign_key: :measurement_id,
+        subitem_class: Readout,
+        value_field: :value
       }
-    VALUE_COLUMNS = {
-      Measurement => :value,
-      Ingredient => :amount
     }
 
     def filter(filters, requested_q = nil)
@@ -20,12 +26,17 @@ module BodyTracking
         items = items.where(hidden: filters[:visibility] == "1" ? false : true)
       end
 
-      project = proxy_association.owner
-      domain = QUANTITY_DOMAINS[proxy_association.klass]
-      formula_q = if filters[:formula].present?
-                    project.quantities.new(name: 'Filter formula',
+      formula_q =
+        if filters[:formula].present?
+          owner = proxy_association.owner
+          project = owner.is_a?(Project) ? owner : owner.project
+          domain = RELATIONS[proxy_association.klass.name][:domain]
+          formula_q_attrs = {
+            name: 'Filter formula',
             formula_attributes: filters[:formula],
-                                           domain: domain)
+            domain: domain
+          }
+          project.quantities.new(formula_q_attrs)
         end
       apply_formula = formula_q.present? && formula_q.valid?
 
@@ -45,15 +56,13 @@ module BodyTracking
       unchecked_q = requested_q.map { |q| [q, nil] }
       unchecked_q << [filter_q, nil] if filter_q
 
-      item_class = proxy_association.klass
-      subitem_type = item_class.nested_attributes_options.keys.first.to_s
-      subitem_reflection = item_class.reflections[subitem_type]
-      subitem_class = subitem_reflection.klass
-      subitems_scope = subitem_class.where(subitem_reflection.options[:inverse_of] => items)
+      relations = RELATIONS[proxy_association.klass.name]
       subitems = Hash.new { |h,k| h[k] = {} }
-      subitems_scope.includes(:quantity, :unit).order('quantities.lft').each do |s|
-        item_id = s.send(subitem_reflection.foreign_key)
-        subitem_value = s.send(VALUE_COLUMNS[item_class])
+      relations[:subitem_class].where(relations[:foreign_key] => items)
+        .includes(:quantity, :unit).order('quantities.lft').each do |s|
+
+        item_id = s.send(relations[:foreign_key])
+        subitem_value = s.send(relations[:value_field])
         subitems[s.quantity][item_id] = [subitem_value, s.unit]
       end
 

lib/body_tracking/project_patch.rb

@@ -1,21 +1,18 @@
-module BodyTracking
-  module ProjectPatch
+module BodyTracking::ProjectPatch
   Project.class_eval do
+    has_many :measurement_routines, dependent: :destroy
     has_many :measurements, -> { order "taken_at DESC" }, dependent: :destroy,
-        extend: ItemsWithQuantities
+      extend: BodyTracking::ItemsWithQuantities, through: :measurement_routines
     has_many :ingredients, -> { order "name" }, dependent: :destroy,
-        extend: ItemsWithQuantities
+      extend: BodyTracking::ItemsWithQuantities
 
     has_many :sources, dependent: :destroy
-      has_many :column_views, dependent: :destroy
     has_many :quantities, -> { order "lft" }, dependent: :destroy
     has_many :units, dependent: :destroy
 
-      def nutrients_column_view
-        self.column_views
-          .find_or_create_by(name: 'Nutrients', domain: ColumnView.domains[:diet])
-      end
-    end
+    has_many :nutrient_columns, as: :column_view, dependent: :destroy, class_name: 'Column',
+      extend: BodyTracking::TogglableColumns
+    has_many :nutrient_quantities, -> { order "lft" }, through: :nutrient_columns,
+      source: 'quantity'
   end
 end
-

lib/body_tracking/togglable_columns.rb

@@ -0,0 +1,7 @@
+module BodyTracking::TogglableColumns
+  # TODO: enforce 'domain' identity between quantites and receiving collection?
+  def toggle!(q)
+    column = find_by(quantity: q)
+    column ? destroy(column) : create(quantity: q)
+  end
+end