From bcd8ffa2183a1ca98417fb39bbd83e8f69c984c8 Mon Sep 17 00:00:00 2001
From: Bryan Helmkamp <bryan@brynary.com>
Date: Wed, 30 Sep 2009 23:32:05 -0400
Subject: Create Predicates module to match directory structure

---
 spec/arel/algebra/unit/predicates/binary_spec.rb   |  42 +++---
 spec/arel/algebra/unit/predicates/equality_spec.rb |  36 ++---
 spec/arel/algebra/unit/predicates/in_spec.rb       |  10 +-
 .../arel/algebra/unit/primitives/attribute_spec.rb |  14 +-
 spec/arel/algebra/unit/relations/relation_spec.rb  |   2 +-
 .../engines/sql/unit/predicates/binary_spec.rb     | 150 +++++++++++----------
 .../engines/sql/unit/predicates/equality_spec.rb   |  78 +++++------
 spec/arel/engines/sql/unit/predicates/in_spec.rb   | 110 +++++++--------
 .../engines/sql/unit/predicates/predicates_spec.rb |  92 ++++++-------
 9 files changed, 274 insertions(+), 260 deletions(-)

(limited to 'spec')

diff --git a/spec/arel/algebra/unit/predicates/binary_spec.rb b/spec/arel/algebra/unit/predicates/binary_spec.rb
index 97ef098e0e..be4c1ac738 100644
--- a/spec/arel/algebra/unit/predicates/binary_spec.rb
+++ b/spec/arel/algebra/unit/predicates/binary_spec.rb
@@ -1,31 +1,33 @@
 require 'spec_helper'
 
 module Arel
-  describe Binary do
-    before do
-      @relation = Table.new(:users)
-      @attribute1 = @relation[:id]
-      @attribute2 = @relation[:name]
-      class ConcreteBinary < Binary
-      end
-    end
-
-    describe '#bind' do
+  module Predicates
+    describe Binary do
       before do
-        @another_relation = @relation.alias
+        @relation = Table.new(:users)
+        @attribute1 = @relation[:id]
+        @attribute2 = @relation[:name]
+        class ConcreteBinary < Binary
+        end
       end
 
-      describe 'when both operands are attributes' do
-        it "manufactures an expression with the attributes bound to the relation" do
-          ConcreteBinary.new(@attribute1, @attribute2).bind(@another_relation). \
-            should == ConcreteBinary.new(@another_relation[@attribute1], @another_relation[@attribute2])
+      describe '#bind' do
+        before do
+          @another_relation = @relation.alias
+        end
+
+        describe 'when both operands are attributes' do
+          it "manufactures an expression with the attributes bound to the relation" do
+            ConcreteBinary.new(@attribute1, @attribute2).bind(@another_relation). \
+              should == ConcreteBinary.new(@another_relation[@attribute1], @another_relation[@attribute2])
+          end
         end
-      end
 
-      describe 'when an operand is a value' do
-        it "manufactures an expression with unmodified values" do
-          ConcreteBinary.new(@attribute1, "asdf").bind(@another_relation). \
-            should == ConcreteBinary.new(@attribute1.find_correlate_in(@another_relation), "asdf".find_correlate_in(@another_relation))
+        describe 'when an operand is a value' do
+          it "manufactures an expression with unmodified values" do
+            ConcreteBinary.new(@attribute1, "asdf").bind(@another_relation). \
+              should == ConcreteBinary.new(@attribute1.find_correlate_in(@another_relation), "asdf".find_correlate_in(@another_relation))
+          end
         end
       end
     end
diff --git a/spec/arel/algebra/unit/predicates/equality_spec.rb b/spec/arel/algebra/unit/predicates/equality_spec.rb
index 01917842f6..cfd04cd90c 100644
--- a/spec/arel/algebra/unit/predicates/equality_spec.rb
+++ b/spec/arel/algebra/unit/predicates/equality_spec.rb
@@ -1,26 +1,28 @@
 require 'spec_helper'
 
 module Arel
-  describe Equality do
-    before do
-      @relation1 = Table.new(:users)
-      @relation2 = Table.new(:photos)
-      @attribute1 = @relation1[:id]
-      @attribute2 = @relation2[:user_id]
-    end
-
-    describe '==' do
-      it "obtains if attribute1 and attribute2 are identical" do
-        check Equality.new(@attribute1, @attribute2).should == Equality.new(@attribute1, @attribute2)
-        Equality.new(@attribute1, @attribute2).should_not == Equality.new(@attribute1, @attribute1)
+  module Predicates
+    describe Equality do
+      before do
+        @relation1 = Table.new(:users)
+        @relation2 = Table.new(:photos)
+        @attribute1 = @relation1[:id]
+        @attribute2 = @relation2[:user_id]
       end
 
-      it "obtains if the concrete type of the predicates are identical" do
-        Equality.new(@attribute1, @attribute2).should_not == Binary.new(@attribute1, @attribute2)
-      end
+      describe '==' do
+        it "obtains if attribute1 and attribute2 are identical" do
+          check Equality.new(@attribute1, @attribute2).should == Equality.new(@attribute1, @attribute2)
+          Equality.new(@attribute1, @attribute2).should_not == Equality.new(@attribute1, @attribute1)
+        end
+
+        it "obtains if the concrete type of the predicates are identical" do
+          Equality.new(@attribute1, @attribute2).should_not == Binary.new(@attribute1, @attribute2)
+        end
 
-      it "is commutative on the attributes" do
-        Equality.new(@attribute1, @attribute2).should == Equality.new(@attribute2, @attribute1)
+        it "is commutative on the attributes" do
+          Equality.new(@attribute1, @attribute2).should == Equality.new(@attribute2, @attribute1)
+        end
       end
     end
   end
diff --git a/spec/arel/algebra/unit/predicates/in_spec.rb b/spec/arel/algebra/unit/predicates/in_spec.rb
index 54a6d6c7da..b9e15d63a4 100644
--- a/spec/arel/algebra/unit/predicates/in_spec.rb
+++ b/spec/arel/algebra/unit/predicates/in_spec.rb
@@ -1,10 +1,12 @@
 require 'spec_helper'
 
 module Arel
-  describe In do
-    before do
-      @relation = Table.new(:users)
-      @attribute = @relation[:id]
+  module Predicates
+    describe In do
+      before do
+        @relation = Table.new(:users)
+        @attribute = @relation[:id]
+      end
     end
   end
 end
diff --git a/spec/arel/algebra/unit/primitives/attribute_spec.rb b/spec/arel/algebra/unit/primitives/attribute_spec.rb
index 93b661c6fc..f734cc9c38 100644
--- a/spec/arel/algebra/unit/primitives/attribute_spec.rb
+++ b/spec/arel/algebra/unit/primitives/attribute_spec.rb
@@ -87,43 +87,43 @@ module Arel
 
       describe '#eq' do
         it "manufactures an equality predicate" do
-          @attribute.eq('name').should == Equality.new(@attribute, 'name')
+          @attribute.eq('name').should == Predicates::Equality.new(@attribute, 'name')
         end
       end
 
       describe '#lt' do
         it "manufactures a less-than predicate" do
-          @attribute.lt(10).should == LessThan.new(@attribute, 10)
+          @attribute.lt(10).should == Predicates::LessThan.new(@attribute, 10)
         end
       end
 
       describe '#lteq' do
         it "manufactures a less-than or equal-to predicate" do
-          @attribute.lteq(10).should == LessThanOrEqualTo.new(@attribute, 10)
+          @attribute.lteq(10).should == Predicates::LessThanOrEqualTo.new(@attribute, 10)
         end
       end
 
       describe '#gt' do
         it "manufactures a greater-than predicate" do
-          @attribute.gt(10).should == GreaterThan.new(@attribute, 10)
+          @attribute.gt(10).should == Predicates::GreaterThan.new(@attribute, 10)
         end
       end
 
       describe '#gteq' do
         it "manufactures a greater-than or equal-to predicate" do
-          @attribute.gteq(10).should == GreaterThanOrEqualTo.new(@attribute, 10)
+          @attribute.gteq(10).should == Predicates::GreaterThanOrEqualTo.new(@attribute, 10)
         end
       end
 
       describe '#matches' do
         it "manufactures a match predicate" do
-          @attribute.matches(/.*/).should == Match.new(@attribute, /.*/)
+          @attribute.matches(/.*/).should == Predicates::Match.new(@attribute, /.*/)
         end
       end
 
       describe '#in' do
         it "manufactures an in predicate" do
-          @attribute.in(1..30).should == In.new(@attribute, (1..30))
+          @attribute.in(1..30).should == Predicates::In.new(@attribute, (1..30))
         end
       end
     end
diff --git a/spec/arel/algebra/unit/relations/relation_spec.rb b/spec/arel/algebra/unit/relations/relation_spec.rb
index 2688ece4a5..35ce8bf1fb 100644
--- a/spec/arel/algebra/unit/relations/relation_spec.rb
+++ b/spec/arel/algebra/unit/relations/relation_spec.rb
@@ -80,7 +80,7 @@ module Arel
 
       describe '#where' do
         before do
-          @predicate = Equality.new(@attribute1, @attribute2)
+          @predicate = Predicates::Equality.new(@attribute1, @attribute2)
         end
 
         it "manufactures a where relation" do
diff --git a/spec/arel/engines/sql/unit/predicates/binary_spec.rb b/spec/arel/engines/sql/unit/predicates/binary_spec.rb
index 783e6c6a7b..23bce54792 100644
--- a/spec/arel/engines/sql/unit/predicates/binary_spec.rb
+++ b/spec/arel/engines/sql/unit/predicates/binary_spec.rb
@@ -1,114 +1,116 @@
 require 'spec_helper'
 
 module Arel
-  describe Binary do
-    class ConcreteBinary < Binary
-      def predicate_sql
-        "<=>"
+  module Predicates
+    describe Binary do
+      class ConcreteBinary < Binary
+        def predicate_sql
+          "<=>"
+        end
       end
-    end
-
-    before do
-      @relation = Table.new(:users)
-      @attribute1 = @relation[:id]
-      @attribute2 = @relation[:name]
-    end
 
-    describe "with compound predicates" do
       before do
-        @operand1 = ConcreteBinary.new(@attribute1, 1)
-        @operand2 = ConcreteBinary.new(@attribute2, "name")
+        @relation = Table.new(:users)
+        @attribute1 = @relation[:id]
+        @attribute2 = @relation[:name]
       end
 
-      describe Or do
-        describe "#to_sql" do
-          it "manufactures sql with an OR operation" do
-            sql = Or.new(@operand1, @operand2).to_sql
+      describe "with compound predicates" do
+        before do
+          @operand1 = ConcreteBinary.new(@attribute1, 1)
+          @operand2 = ConcreteBinary.new(@attribute2, "name")
+        end
 
-            adapter_is :mysql do
-              sql.should be_like(%Q{(`users`.`id` <=> 1 OR `users`.`name` <=> 'name')})
-            end
+        describe Or do
+          describe "#to_sql" do
+            it "manufactures sql with an OR operation" do
+              sql = Or.new(@operand1, @operand2).to_sql
 
-            adapter_is :postgresql do
-              sql.should be_like(%Q{("users"."id" <=> 1 OR "users"."name" <=> E'name')})
-            end
+              adapter_is :mysql do
+                sql.should be_like(%Q{(`users`.`id` <=> 1 OR `users`.`name` <=> 'name')})
+              end
+
+              adapter_is :postgresql do
+                sql.should be_like(%Q{("users"."id" <=> 1 OR "users"."name" <=> E'name')})
+              end
 
-            adapter_is :sqlite3 do
-              sql.should be_like(%Q{("users"."id" <=> 1 OR "users"."name" <=> 'name')})
+              adapter_is :sqlite3 do
+                sql.should be_like(%Q{("users"."id" <=> 1 OR "users"."name" <=> 'name')})
+              end
             end
           end
         end
-      end
 
-      describe And do
-        describe "#to_sql" do
-          it "manufactures sql with an AND operation" do
-            sql = And.new(@operand1, @operand2).to_sql
+        describe And do
+          describe "#to_sql" do
+            it "manufactures sql with an AND operation" do
+              sql = And.new(@operand1, @operand2).to_sql
 
-            adapter_is :mysql do
-              sql.should be_like(%Q{(`users`.`id` <=> 1 AND `users`.`name` <=> 'name')})
-            end
+              adapter_is :mysql do
+                sql.should be_like(%Q{(`users`.`id` <=> 1 AND `users`.`name` <=> 'name')})
+              end
 
-            adapter_is :sqlite3 do
-              sql.should be_like(%Q{("users"."id" <=> 1 AND "users"."name" <=> 'name')})
-            end
+              adapter_is :sqlite3 do
+                sql.should be_like(%Q{("users"."id" <=> 1 AND "users"."name" <=> 'name')})
+              end
 
-            adapter_is :postgresql do
-              sql.should be_like(%Q{("users"."id" <=> 1 AND "users"."name" <=> E'name')})
+              adapter_is :postgresql do
+                sql.should be_like(%Q{("users"."id" <=> 1 AND "users"."name" <=> E'name')})
+              end
             end
           end
         end
       end
-    end
 
-    describe '#to_sql' do
-      describe 'when relating two attributes' do
-        it 'manufactures sql with a binary operation' do
-          sql = ConcreteBinary.new(@attribute1, @attribute2).to_sql
+      describe '#to_sql' do
+        describe 'when relating two attributes' do
+          it 'manufactures sql with a binary operation' do
+            sql = ConcreteBinary.new(@attribute1, @attribute2).to_sql
 
-          adapter_is :mysql do
-            sql.should be_like(%Q{`users`.`id` <=> `users`.`name`})
-          end
+            adapter_is :mysql do
+              sql.should be_like(%Q{`users`.`id` <=> `users`.`name`})
+            end
 
-          adapter_is_not :mysql do
-            sql.should be_like(%Q{"users"."id" <=> "users"."name"})
+            adapter_is_not :mysql do
+              sql.should be_like(%Q{"users"."id" <=> "users"."name"})
+            end
           end
         end
-      end
 
-      describe 'when relating an attribute and a value' do
-        before do
-          @value = "1-asdf"
-        end
+        describe 'when relating an attribute and a value' do
+          before do
+            @value = "1-asdf"
+          end
 
-        describe 'when relating to an integer attribute' do
-          it 'formats values as integers' do
-            sql = ConcreteBinary.new(@attribute1, @value).to_sql
+          describe 'when relating to an integer attribute' do
+            it 'formats values as integers' do
+              sql = ConcreteBinary.new(@attribute1, @value).to_sql
 
-            adapter_is :mysql do
-              sql.should be_like(%Q{`users`.`id` <=> 1})
-            end
+              adapter_is :mysql do
+                sql.should be_like(%Q{`users`.`id` <=> 1})
+              end
 
-            adapter_is_not :mysql do
-              sql.should be_like(%Q{"users"."id" <=> 1})
+              adapter_is_not :mysql do
+                sql.should be_like(%Q{"users"."id" <=> 1})
+              end
             end
           end
-        end
 
-        describe 'when relating to a string attribute' do
-          it 'formats values as strings' do
-            sql = ConcreteBinary.new(@attribute2, @value).to_sql
+          describe 'when relating to a string attribute' do
+            it 'formats values as strings' do
+              sql = ConcreteBinary.new(@attribute2, @value).to_sql
 
-            adapter_is :mysql do
-              sql.should be_like(%Q{`users`.`name` <=> '1-asdf'})
-            end
+              adapter_is :mysql do
+                sql.should be_like(%Q{`users`.`name` <=> '1-asdf'})
+              end
 
-            adapter_is :sqlite3 do
-              sql.should be_like(%Q{"users"."name" <=> '1-asdf'})
-            end
+              adapter_is :sqlite3 do
+                sql.should be_like(%Q{"users"."name" <=> '1-asdf'})
+              end
 
-            adapter_is :postgresql do
-              sql.should be_like(%Q{"users"."name" <=> E'1-asdf'})
+              adapter_is :postgresql do
+                sql.should be_like(%Q{"users"."name" <=> E'1-asdf'})
+              end
             end
           end
         end
diff --git a/spec/arel/engines/sql/unit/predicates/equality_spec.rb b/spec/arel/engines/sql/unit/predicates/equality_spec.rb
index c4dd2c0c31..4004bb5881 100644
--- a/spec/arel/engines/sql/unit/predicates/equality_spec.rb
+++ b/spec/arel/engines/sql/unit/predicates/equality_spec.rb
@@ -1,58 +1,60 @@
 require 'spec_helper'
 
 module Arel
-  describe Equality do
-    before do
-      @relation1 = Table.new(:users)
-      @relation2 = Table.new(:photos)
-      @attribute1 = @relation1[:id]
-      @attribute2 = @relation2[:user_id]
-    end
+  module Predicates
+    describe Equality do
+      before do
+        @relation1 = Table.new(:users)
+        @relation2 = Table.new(:photos)
+        @attribute1 = @relation1[:id]
+        @attribute2 = @relation2[:user_id]
+      end
 
-    describe '#to_sql' do
-      describe 'when relating to a non-nil value' do
-        it "manufactures an equality predicate" do
-          sql = Equality.new(@attribute1, @attribute2).to_sql
+      describe '#to_sql' do
+        describe 'when relating to a non-nil value' do
+          it "manufactures an equality predicate" do
+            sql = Equality.new(@attribute1, @attribute2).to_sql
 
-          adapter_is :mysql do
-            sql.should be_like(%Q{`users`.`id` = `photos`.`user_id`})
-          end
+            adapter_is :mysql do
+              sql.should be_like(%Q{`users`.`id` = `photos`.`user_id`})
+            end
 
-          adapter_is_not :mysql do
-            sql.should be_like(%Q{"users"."id" = "photos"."user_id"})
+            adapter_is_not :mysql do
+              sql.should be_like(%Q{"users"."id" = "photos"."user_id"})
+            end
           end
         end
-      end
 
-      describe 'when relation to a nil value' do
-        before do
-          @nil = nil
-        end
+        describe 'when relation to a nil value' do
+          before do
+            @nil = nil
+          end
 
-        it "manufactures an is null predicate" do
-          sql = Equality.new(@attribute1, @nil).to_sql
+          it "manufactures an is null predicate" do
+            sql = Equality.new(@attribute1, @nil).to_sql
 
-          adapter_is :mysql do
-            sql.should be_like(%Q{`users`.`id` IS NULL})
-          end
+            adapter_is :mysql do
+              sql.should be_like(%Q{`users`.`id` IS NULL})
+            end
 
-          adapter_is_not :mysql do
-            sql.should be_like(%Q{"users"."id" IS NULL})
+            adapter_is_not :mysql do
+              sql.should be_like(%Q{"users"."id" IS NULL})
+            end
           end
         end
-      end
 
-      describe "when relating to a nil Value" do
-        it "manufactures an IS NULL predicate" do
-          value = nil.bind(@relation1)
-          sql = Equality.new(@attribute1, value).to_sql
+        describe "when relating to a nil Value" do
+          it "manufactures an IS NULL predicate" do
+            value = nil.bind(@relation1)
+            sql = Equality.new(@attribute1, value).to_sql
 
-          adapter_is :mysql do
-            sql.should be_like(%Q{`users`.`id` IS NULL})
-          end
+            adapter_is :mysql do
+              sql.should be_like(%Q{`users`.`id` IS NULL})
+            end
 
-          adapter_is_not :mysql do
-            sql.should be_like(%Q{"users"."id" IS NULL})
+            adapter_is_not :mysql do
+              sql.should be_like(%Q{"users"."id" IS NULL})
+            end
           end
         end
       end
diff --git a/spec/arel/engines/sql/unit/predicates/in_spec.rb b/spec/arel/engines/sql/unit/predicates/in_spec.rb
index 4a3eff79ec..bb00733e60 100644
--- a/spec/arel/engines/sql/unit/predicates/in_spec.rb
+++ b/spec/arel/engines/sql/unit/predicates/in_spec.rb
@@ -1,83 +1,85 @@
 require 'spec_helper'
 
 module Arel
-  describe In do
-    before do
-      @relation = Table.new(:users)
-      @attribute = @relation[:id]
-    end
+  module Predicates
+    describe In do
+      before do
+        @relation = Table.new(:users)
+        @attribute = @relation[:id]
+      end
 
-    describe '#to_sql' do
-      describe 'when relating to an array' do
-        describe 'when the array\'s elements are the same type as the attribute' do
-          before do
-            @array = [1, 2, 3]
-          end
+      describe '#to_sql' do
+        describe 'when relating to an array' do
+          describe 'when the array\'s elements are the same type as the attribute' do
+            before do
+              @array = [1, 2, 3]
+            end
 
-          it 'manufactures sql with a comma separated list' do
-            sql = In.new(@attribute, @array).to_sql
+            it 'manufactures sql with a comma separated list' do
+              sql = In.new(@attribute, @array).to_sql
 
-            adapter_is :mysql do
-              sql.should be_like(%Q{`users`.`id` IN (1, 2, 3)})
+              adapter_is :mysql do
+                sql.should be_like(%Q{`users`.`id` IN (1, 2, 3)})
+              end
+
+              adapter_is_not :mysql do
+                sql.should be_like(%Q{"users"."id" IN (1, 2, 3)})
+              end
             end
+          end
 
-            adapter_is_not :mysql do
-              sql.should be_like(%Q{"users"."id" IN (1, 2, 3)})
+          describe 'when the array\'s elements are not same type as the attribute' do
+            before do
+              @array = ['1-asdf', 2, 3]
+            end
+
+            it 'formats values in the array as the type of the attribute' do
+              sql = In.new(@attribute, @array).to_sql
+
+              adapter_is :mysql do
+                sql.should be_like(%Q{`users`.`id` IN (1, 2, 3)})
+              end
+
+              adapter_is_not :mysql do
+                sql.should be_like(%Q{"users"."id" IN (1, 2, 3)})
+              end
             end
           end
         end
 
-        describe 'when the array\'s elements are not same type as the attribute' do
+        describe 'when relating to a range' do
           before do
-            @array = ['1-asdf', 2, 3]
+            @range = 1..2
           end
 
-          it 'formats values in the array as the type of the attribute' do
-            sql = In.new(@attribute, @array).to_sql
+          it 'manufactures sql with a between' do
+            sql = In.new(@attribute, @range).to_sql
 
             adapter_is :mysql do
-              sql.should be_like(%Q{`users`.`id` IN (1, 2, 3)})
+              sql.should be_like(%Q{`users`.`id` BETWEEN 1 AND 2})
             end
 
             adapter_is_not :mysql do
-              sql.should be_like(%Q{"users"."id" IN (1, 2, 3)})
+              sql.should be_like(%Q{"users"."id" BETWEEN 1 AND 2})
             end
           end
         end
-      end
-
-      describe 'when relating to a range' do
-        before do
-          @range = 1..2
-        end
-
-        it 'manufactures sql with a between' do
-          sql = In.new(@attribute, @range).to_sql
-
-          adapter_is :mysql do
-            sql.should be_like(%Q{`users`.`id` BETWEEN 1 AND 2})
-          end
-
-          adapter_is_not :mysql do
-            sql.should be_like(%Q{"users"."id" BETWEEN 1 AND 2})
-          end
-        end
-      end
 
-      describe 'when relating to a relation' do
-        it 'manufactures sql with a subselect' do
-          sql = In.new(@attribute, @relation).to_sql
+        describe 'when relating to a relation' do
+          it 'manufactures sql with a subselect' do
+            sql = In.new(@attribute, @relation).to_sql
 
-          adapter_is :mysql do
-            sql.should be_like(%Q{
-              `users`.`id` IN (SELECT `users`.`id`, `users`.`name` FROM `users`)
-            })
-          end
+            adapter_is :mysql do
+              sql.should be_like(%Q{
+                `users`.`id` IN (SELECT `users`.`id`, `users`.`name` FROM `users`)
+              })
+            end
 
-          adapter_is_not :mysql do
-            sql.should be_like(%Q{
-              "users"."id" IN (SELECT "users"."id", "users"."name" FROM "users")
-            })
+            adapter_is_not :mysql do
+              sql.should be_like(%Q{
+                "users"."id" IN (SELECT "users"."id", "users"."name" FROM "users")
+              })
+            end
           end
         end
       end
diff --git a/spec/arel/engines/sql/unit/predicates/predicates_spec.rb b/spec/arel/engines/sql/unit/predicates/predicates_spec.rb
index fe0010a8cb..7d53351546 100644
--- a/spec/arel/engines/sql/unit/predicates/predicates_spec.rb
+++ b/spec/arel/engines/sql/unit/predicates/predicates_spec.rb
@@ -1,62 +1,64 @@
 require 'spec_helper'
 
 module Arel
-  describe Predicate do
-    before do
-      @relation = Table.new(:users)
-      @attribute1 = @relation[:id]
-      @attribute2 = @relation[:name]
-      @operand1 = Equality.new(@attribute1, 1)
-      @operand2 = Equality.new(@attribute2, "name")
-    end
+  module Predicates
+    describe Predicate do
+      before do
+        @relation = Table.new(:users)
+        @attribute1 = @relation[:id]
+        @attribute2 = @relation[:name]
+        @operand1 = Equality.new(@attribute1, 1)
+        @operand2 = Equality.new(@attribute2, "name")
+      end
 
-    describe "when being combined with another predicate with AND logic" do
-      describe "#to_sql" do
-        it "manufactures sql with an AND operation" do
-          sql = @operand1.and(@operand2).to_sql
+      describe "when being combined with another predicate with AND logic" do
+        describe "#to_sql" do
+          it "manufactures sql with an AND operation" do
+            sql = @operand1.and(@operand2).to_sql
 
-          adapter_is :mysql do
-            sql.should be_like(%Q{
-              (`users`.`id` = 1 AND `users`.`name` = 'name')
-            })
-          end
+            adapter_is :mysql do
+              sql.should be_like(%Q{
+                (`users`.`id` = 1 AND `users`.`name` = 'name')
+              })
+            end
 
-          adapter_is :sqlite3 do
-            sql.should be_like(%Q{
-              ("users"."id" = 1 AND "users"."name" = 'name')
-            })
-          end
+            adapter_is :sqlite3 do
+              sql.should be_like(%Q{
+                ("users"."id" = 1 AND "users"."name" = 'name')
+              })
+            end
 
-          adapter_is :postgresql do
-            sql.should be_like(%Q{
-              ("users"."id" = 1 AND "users"."name" = E'name')
-            })
+            adapter_is :postgresql do
+              sql.should be_like(%Q{
+                ("users"."id" = 1 AND "users"."name" = E'name')
+              })
+            end
           end
         end
       end
-    end
 
-    describe "when being combined with another predicate with OR logic" do
-      describe "#to_sql" do
-        it "manufactures sql with an OR operation" do
-          sql = @operand1.or(@operand2).to_sql
+      describe "when being combined with another predicate with OR logic" do
+        describe "#to_sql" do
+          it "manufactures sql with an OR operation" do
+            sql = @operand1.or(@operand2).to_sql
 
-          adapter_is :mysql do
-            sql.should be_like(%Q{
-              (`users`.`id` = 1 OR `users`.`name` = 'name')
-            })
-          end
+            adapter_is :mysql do
+              sql.should be_like(%Q{
+                (`users`.`id` = 1 OR `users`.`name` = 'name')
+              })
+            end
 
-          adapter_is :sqlite3 do
-            sql.should be_like(%Q{
-              ("users"."id" = 1 OR "users"."name" = 'name')
-            })
-          end
+            adapter_is :sqlite3 do
+              sql.should be_like(%Q{
+                ("users"."id" = 1 OR "users"."name" = 'name')
+              })
+            end
 
-          adapter_is :postgresql do
-            sql.should be_like(%Q{
-              ("users"."id" = 1 OR "users"."name" = E'name')
-            })
+            adapter_is :postgresql do
+              sql.should be_like(%Q{
+                ("users"."id" = 1 OR "users"."name" = E'name')
+              })
+            end
           end
         end
       end
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