Added methods for finding couny for ledger, tax zone for county and t…

…ax rate for tax zone

app/models/county.rb

@@ -4,4 +4,18 @@ class County < ActiveRecord::Base
   accepts_nested_attributes_for :county_tax_zones, :allow_destroy => false
   accepts_nested_attributes_for :county_ledgers, :allow_destroy => false
   validates_presence_of :name, :allow_nil => false
+
+  def tax_zone_at_date date
+    if !self.county_tax_zones.blank?
+        tz = self.county_tax_zones.where('"from" <= ? ', date).where('is_visible is true').order('"from" asc').first
+        if tz != nil
+            return tz.tax_zone
+        else
+            return nil
+        end
+    else
+        []
+    end
+  end
+
 end

app/models/ledger.rb

@@ -48,7 +48,12 @@ def last_name
 
     def county_at_date date
         if !self.county_ledgers.blank?
-            self.county_ledgers.where('"from" <= ? ', date).first.county 
+            c = self.county_ledgers.where('"from" <= ? ', date).order('"from" asc').first
+             if c != nil
+                return c.county 
+            else
+                return nil
+            end
         else
             []
         end

app/models/tax_zone.rb

@@ -3,4 +3,18 @@ class TaxZone < ActiveRecord::Base
   has_many :county_tax_zones
   accepts_nested_attributes_for :county_tax_zones, :allow_destroy => false
   accepts_nested_attributes_for :tax_zone_taxes, :allow_destroy => false
+
+  def tax_zone_rate_at_date date
+    tr = nil
+    if !self.tax_zone_taxes.blank?
+        tr = self.tax_zone_taxes.where('"from" <= ? ', date).where('is_visible is true').order('"from" asc').first
+    end
+
+    if tr != nil
+        return tr.tax_rate.to_f
+    else
+        return nil
+    end 
+  end
+
 end