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/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|