Destroy geocode_grade_walkzone_schools when schools, geocodes, grade_…

…levels and grade_level_schools are destroyed

app/models/geocode.rb

@@ -1,5 +1,6 @@
 class Geocode < ActiveRecord::Base
   has_many :address_ranges
-  has_many :geocode_grade_walkzone_schools
+  has_many :geocode_grade_walkzone_schools, :dependent => :destroy
   belongs_to :assignment_zone
+
 end

app/models/grade_level.rb

@@ -1,6 +1,7 @@
 class GradeLevel < ActiveRecord::Base
-  has_many :grade_level_schools
+  has_many :grade_level_schools, :dependent => :destroy
   has_many :schools, :through => :grade_level_schools
+  has_many :geocode_grade_walkzone_schools, :dependent => :destroy
 
   def assignment_zone_schools(geocoded_address, assignment_zone)
     schools = self.schools.where(:assignment_zone_id => assignment_zone)

app/models/grade_level_school.rb

@@ -1,6 +1,7 @@
 class GradeLevelSchool < ActiveRecord::Base
   belongs_to :school
   belongs_to :grade_level
+  before_destroy :delete_geocode_grade_walkzone_schools
 
   def total_choices
     if first_choice.present?
@@ -54,4 +55,10 @@ def math_percentile
     scores = GradeLevelSchool.find_all_by_grade_number(self.grade_number).map(&:math_score).compact.sort
     ((scores.index(self.math_score) / scores.size.to_f) * 100).to_i
   end
+
+  private
+
+  def delete_geocode_grade_walkzone_schools
+    GeocodeGradeWalkzoneSchool.where(grade_level_id: self.grade_level.try(:id), school_id: self.school.try(:id)).delete_all
+  end
 end

app/models/school.rb

@@ -11,7 +11,7 @@ class School < ActiveRecord::Base
   belongs_to :parcel
   belongs_to :principal
   belongs_to :state
-  has_many :geocode_grade_walkzone_schools
+  has_many :geocode_grade_walkzone_schools, :dependent => :destroy
 
   attr_accessor :eligibility, :eligibility_index
   # before_save :recalculate_school_assignment so if they change a school location or add a school it will be reindexed TODO