Views for unique validations created on loading, not execution

history.md

@@ -10,6 +10,7 @@
   * Removed railties dependency (DAddYE)
   * DesignDoc cache refreshed if a database is deleted.
   * Fixing dirty tracking on collection_of association.
+  * Uniqueness Validation views created on initialization, not on demand!
 
 
 ## 1.1.0.beta5 - 2011-04-30

lib/couchrest/model/validations/uniqueness.rb

@@ -3,37 +3,41 @@
 module CouchRest
   module Model
     module Validations
-      
+
       # Validates if a field is unique 
       class UniquenessValidator < ActiveModel::EachValidator
 
         # Ensure we have a class available so we can check for a usable view
         # or add one if necessary.
         def setup(model)
           @model = model
+          if options[:view].blank?
+            attributes.each do |attribute|
+              opts = merge_view_options(attribute)
+
+              if model.respond_to?(:has_view?) && !model.has_view?(opts[:view_name])
+                opts[:keys] << {:allow_nil => true}
+                model.view_by(*opts[:keys])
+              end
+            end
+          end
         end
 
         def validate_each(document, attribute, value)
-          keys = [attribute]
-          unless options[:scope].nil?
-            keys = (options[:scope].is_a?(Array) ? options[:scope] : [options[:scope]]) + keys
-          end
-          values = keys.map{|k| document.send(k)}
-          values = values.first if values.length == 1
+          opts = merge_view_options(attribute)
 
-          view_name = options[:view].nil? ? "by_#{keys.join('_and_')}" : options[:view]
+          values = opts[:keys].map{|k| document.send(k)}
+          values = values.first if values.length == 1
 
           model = (document.respond_to?(:model_proxy) && document.model_proxy ? document.model_proxy : @model)
           # Determine the base of the search
-          base = options[:proxy].nil? ? model : document.instance_eval(options[:proxy])
+          base = opts[:proxy].nil? ? model : document.instance_eval(opts[:proxy])
 
-          if base.respond_to?(:has_view?) && !base.has_view?(view_name)
-            raise "View #{document.class.name}.#{options[:view]} does not exist!" unless options[:view].nil?
-            keys << {:allow_nil => true}
-            model.view_by(*keys)
+          if base.respond_to?(:has_view?) && !base.has_view?(opts[:view_name])
+            raise "View #{document.class.name}.#{opts[:view_name]} does not exist for validation!"
           end
 
-          rows = base.view(view_name, :key => values, :limit => 2, :include_docs => false)['rows']
+          rows = base.view(opts[:view_name], :key => values, :limit => 2, :include_docs => false)['rows']
           return if rows.empty?
 
           unless document.new?
@@ -47,6 +51,17 @@ def validate_each(document, attribute, value)
           end
         end
 
+        private
+
+        def merge_view_options(attr)
+          keys = [attr]
+          keys.unshift(*options[:scope]) unless options[:scope].nil?
+
+          view_name = options[:view].nil? ? "by_#{keys.join('_and_')}" : options[:view]
+
+          options.merge({:keys => keys, :view_name => view_name})
+        end
+
       end
 
     end

spec/couchrest/validations_spec.rb

@@ -16,7 +16,11 @@
       before(:all) do
         @objs = ['title 1', 'title 2', 'title 3'].map{|t| WithUniqueValidation.create(:title => t)}
       end
-
+
+      it "should create a new view if none defined before performing" do
+        WithUniqueValidation.has_view?(:by_title).should be_true
+      end
+
       it "should validate a new unique document" do
         @obj = WithUniqueValidation.create(:title => 'title 4')
         @obj.new?.should_not be_true
@@ -35,6 +39,7 @@
         @obj.should be_valid
       end
 
+
       it "should allow own view to be specified" do
         # validates_uniqueness_of :code, :view => 'all'
         WithUniqueValidationView.create(:title => 'title 1', :code => '1234')
@@ -50,6 +55,13 @@
         }.should raise_error
       end
 
+      it "should not try to create a defined view" do
+        WithUniqueValidationView.validates_uniqueness_of :title, :view => 'fooobar'
+        WithUniqueValidationView.has_view?('fooobar').should be_false
+        WithUniqueValidationView.has_view?('by_title').should be_false
+      end
+
+
       it "should not try to create new view when already defined" do
         @obj = @objs[1]
         @obj.class.should_not_receive('view_by')
@@ -60,6 +72,11 @@
     end
 
     context "with a proxy parameter" do
+
+      it "should create a new view despite proxy" do
+        WithUniqueValidationProxy.has_view?(:by_title).should be_true
+      end
+
       it "should be used" do
         @obj = WithUniqueValidationProxy.new(:title => 'test 6')
         proxy = @obj.should_receive('proxy').and_return(@obj.class)