Added test_defaults_seed_and_load_into_empty_project

Added :defaults scopes to models
Added :sources and :formulas fixtures
Loading defaults from seeds.rb using rake task instead of migration

app/models/formula.rb

@@ -6,6 +6,8 @@ class Formula < ActiveRecord::Base
   belongs_to :quantity, inverse_of: :formula, required: true
   belongs_to :unit
 
+  scope :defaults, -> { includes(:quantity).where(quantities: {project: nil}) }
+
   validates :code, presence: true
   validate do
     messages = parse.each { |message, params| errors.add(:code, message, params) }
@@ -92,7 +94,7 @@ class Formula < ActiveRecord::Base
     # e.g. during import of defaults (so impossible to use recursive sql instead)
     q_names = identifiers.map { |i| i.split('::').last }
     q_paths = {}
-    (quantity.project.try(&:quantities) || Quantity.where(project: nil))
+    (quantity.project.try(&:quantities) || Quantity.defaults)
       .select { |q| q_names.include?(q.name) }.each do |q|
 
       # NOTE: after upgrade to Ruby 2.7 replace with Enumerator#produce

app/models/quantity.rb

@@ -13,6 +13,8 @@ class Quantity < ActiveRecord::Base
   has_many :values, class_name: 'QuantityValue', dependent: :restrict_with_error
   has_many :exposures, dependent: :destroy
 
+  scope :defaults, -> { where(project: nil) }
+
   has_one :formula, inverse_of: :quantity, dependent: :destroy, validate: true
   accepts_nested_attributes_for :formula, allow_destroy: true,
     reject_if: proc { |attrs| attrs['id'].blank? && attrs['code'].blank? }

app/models/source.rb

@@ -1,6 +1,8 @@
 class Source < ActiveRecord::Base
   belongs_to :project, required: false
 
+  scope :defaults, -> { where(project: nil) }
+
   validates :name, presence: true, uniqueness: {scope: :project_id}
 
   # Has to go before any 'dependent:' association

app/models/unit.rb

@@ -1,6 +1,8 @@
 class Unit < ActiveRecord::Base
   belongs_to :project, required: false
 
+  scope :defaults, -> { where(project: nil) }
+
   validates :shortname, presence: true, uniqueness: {scope: :project_id}
 
   # Has to go before any 'dependent:' association