jumpcheng · August 29, 2015 14:21 · May 11, 2015 · May 11, 2015 · May 11, 2015 · May 11, 2015
diff --git a/orm.md b/orm.md
@@ -10,6 +10,7 @@
   * ``find``, -> ``SELECT``
 * An instance of the Model class maps to single row in the table
 * An instance may refer to a 'yet-to-be-inserted' row
+* The ``id`` ruby property maps to the ``PRIMARY KEY ID``
 * Instance methods map to actions on that single row
   * ``save`` -> ``INSERT`` or ``UPDATE`` 
   * ``destroy`` -> ``DELETE``

diff --git a/orm.md b/orm.md
@@ -4,7 +4,8 @@
 * Active Record is also the name of a very popular [Ruby ORM Implementation](http://guides.rubyonrails.org/active_record_basics.html)
 
 # Implementation for SQL RDBMS Databases in Ruby
-* Each Model ``class`` maps to a database ``table``
+* Domain Specific Model classes are defined for specific tables
+* Each Model ``class`` maps to a ``table``
 * Class methods map to actions on the table
   * ``find``, -> ``SELECT``
 * An instance of the Model class maps to single row in the table

diff --git a/orm.md b/orm.md
@@ -3,7 +3,7 @@
 * Active Record is a [Design Pattern](http://en.wikipedia.org/wiki/Active_record_pattern) which can be used to implement ORM
 * Active Record is also the name of a very popular [Ruby ORM Implementation](http://guides.rubyonrails.org/active_record_basics.html)
 
-# Implementation for SQL RDBMS Databases
+# Implementation for SQL RDBMS Databases in Ruby
 * Each Model ``class`` maps to a database ``table``
 * Class methods map to actions on the table
   * ``find``, -> ``SELECT``

diff --git a/orm.md b/orm.md
@@ -3,7 +3,7 @@
 * Active Record is a [Design Pattern](http://en.wikipedia.org/wiki/Active_record_pattern) which can be used to implement ORM
 * Active Record is also the name of a very popular [Ruby ORM Implementation](http://guides.rubyonrails.org/active_record_basics.html)
 
-# Implementation
+# Implementation for SQL RDBMS Databases
 * Each Model ``class`` maps to a database ``table``
 * Class methods map to actions on the table
   * ``find``, -> ``SELECT``

diff --git a/orm.md b/orm.md
@@ -1,9 +1,9 @@
-#Object Relational Mapping
-
+# Object Relational Mapping
 * ORM or [Object Relational Mapping](http://en.wikipedia.org/wiki/Object-relational_mapping) is technique often used map the data in databases to the world of objects in our programs
 * Active Record is a [Design Pattern](http://en.wikipedia.org/wiki/Active_record_pattern) which can be used to implement ORM
 * Active Record is also the name of a very popular [Ruby ORM Implementation](http://guides.rubyonrails.org/active_record_basics.html)
 
+# Implementation
 * Each Model ``class`` maps to a database ``table``
 * Class methods map to actions on the table
   * ``find``, -> ``SELECT``
@@ -13,14 +13,15 @@
   * ``save`` -> ``INSERT`` or ``UPDATE`` 
   * ``destroy`` -> ``DELETE``
 
-#Optional Code Along
+# Discussion
+* What about Related Objects?
 
+# Optional Code Along
 * ``cd parksandrec``
 * ``bundle``
 * ``irb -r ./parksandrec.rb``
 
 # Resources
-
 * [DataMapper Pattern](http://martinfowler.com/eaaCatalog/dataMapper.html)
 * [Repository Pattern](http://martinfowler.com/eaaCatalog/repository.html)
 * [ORM Patterns: The Trade-Offs of Active Record and Data Mappers](http://pressupinc.com/blog/2014/11/orm-patterns-active-record-data-mapper/)
diff --git a/orm.md b/orm.md
@@ -4,11 +4,14 @@
 * Active Record is a [Design Pattern](http://en.wikipedia.org/wiki/Active_record_pattern) which can be used to implement ORM
 * Active Record is also the name of a very popular [Ruby ORM Implementation](http://guides.rubyonrails.org/active_record_basics.html)
 
-* Each Model class maps to a database table
+* Each Model ``class`` maps to a database ``table``
 * Class methods map to actions on the table
-  * 'SELECT' 
+  * ``find``, -> ``SELECT``
 * An instance of the Model class maps to single row in the table
+* An instance may refer to a 'yet-to-be-inserted' row
 * Instance methods map to actions on that single row
+  * ``save`` -> ``INSERT`` or ``UPDATE`` 
+  * ``destroy`` -> ``DELETE``
 
 #Optional Code Along
 

diff --git a/orm.md b/orm.md
@@ -1,9 +1,14 @@
 #Object Relational Mapping
 
-* ORM or [Object Relational Mapping](http://en.wikipedia.org/wiki/Object-relational_mapping) is 
+* ORM or [Object Relational Mapping](http://en.wikipedia.org/wiki/Object-relational_mapping) is technique often used map the data in databases to the world of objects in our programs
 * Active Record is a [Design Pattern](http://en.wikipedia.org/wiki/Active_record_pattern) which can be used to implement ORM
 * Active Record is also the name of a very popular [Ruby ORM Implementation](http://guides.rubyonrails.org/active_record_basics.html)
 
+* Each Model class maps to a database table
+* Class methods map to actions on the table
+  * 'SELECT' 
+* An instance of the Model class maps to single row in the table
+* Instance methods map to actions on that single row
 
 #Optional Code Along
 

diff --git a/orm.md b/orm.md
@@ -0,0 +1,18 @@
+#Object Relational Mapping
+
+* ORM or [Object Relational Mapping](http://en.wikipedia.org/wiki/Object-relational_mapping) is 
+* Active Record is a [Design Pattern](http://en.wikipedia.org/wiki/Active_record_pattern) which can be used to implement ORM
+* Active Record is also the name of a very popular [Ruby ORM Implementation](http://guides.rubyonrails.org/active_record_basics.html)
+
+
+#Optional Code Along
+
+* ``cd parksandrec``
+* ``bundle``
+* ``irb -r ./parksandrec.rb``
+
+# Resources
+
+* [DataMapper Pattern](http://martinfowler.com/eaaCatalog/dataMapper.html)
+* [Repository Pattern](http://martinfowler.com/eaaCatalog/repository.html)
+* [ORM Patterns: The Trade-Offs of Active Record and Data Mappers](http://pressupinc.com/blog/2014/11/orm-patterns-active-record-data-mapper/)