Migrations.

rails-migrations.md

@@ -0,0 +1,92 @@
+title: Rails migrations
+-------
+
+### Run migrations
+
+    $ rake db:migrate
+
+### Migrations
+
+    create_table :users do |t|
+      t.string :name
+      t.text   :description
+
+      t.primary_key :id
+      t.string      :title
+      t.text        :description
+      t.integer     :games_count
+      t.float       :lol
+      t.decimal     :price
+      t.decimal     :price, :precision => 2, :scale => 10
+      t.datetime    :expiration
+      t.timestamp   :time_in
+      t.time        :time_in
+      t.date        :expiry
+      t.binary      :image_data
+      t.boolean     :is_admin
+    end
+
+    # Options:
+      :null (boolean)
+      :limit (integer)
+      :default
+
+### Operations
+
+    create_table
+    change_table
+    drop_table
+    add_column
+    change_column
+    rename_column
+    remove_column
+    add_index
+    remove_index
+
+### Associations
+    
+    t.references :category   # kinda same as t.integer :category_id
+
+    # Can have different types
+    t.references :category, polymorphic: true
+
+### Add/remove columns
+  
+    $ rails generate migration RemovePartNumberFromProducts part_number:string
+
+    class RemovePartNumberFromProducts < ActiveRecord::Migration
+      def up
+        remove_column :products, :part_number
+      end
+     
+      def down
+        add_column :products, :part_number, :string
+      end
+    end
+
+### Indices
+
+    # Simple
+    add_index :suppliers, :name
+
+    # Unique
+    add_index :accounts, [:branch_id, :party_id], :unique => true
+
+    # Named (:name => ...)
+    add_index :accounts, [:branch_id, :party_id], :unique => true, :name => "by_branch_party"
+
+    # Length
+    add_index :accounts, :name, :name => ‘by_name’, :length => 10
+    add_index :accounts, [:name, :surname], :name => ‘by_name_surname’,
+      :length => {
+        :name => 10,
+        :surname => 15
+      }
+
+    # Sort order (no MySQL support)
+    add_index :accounts, [:branch_id, :party_id, :surname],
+      :order => {:branch_id => :desc, :part_id => :asc}
+
+### References
+
+ * http://apidock.com/rails/ActiveRecord/ConnectionAdapters/SchemaStatements/add_index

rails-models.md

@@ -84,73 +84,6 @@ And in migrations:
       t.references :post, :polymorphic => true
     end
 
-Migrations
-----------
-
-### Run migrations
-
-    $ rake db:migrate
-
-### Migrations
-
-    create_table :users do |t|
-      t.string :name
-      t.text   :description
-
-      t.primary_key :id
-      t.string
-      t.text
-      t.integer
-      t.float
-      t.decimal
-      t.datetime
-      t.timestamp
-      t.time
-      t.date
-      t.binary
-      t.boolean
-    end
-
-    options:
-      :null (boolean)
-      :limit (integer)
-      :default
-      :precision (integer)
-      :scale (integer)
-
-### Tasks
-
-    create_table
-    change_table
-    drop_table
-    add_column
-    change_column
-    rename_column
-    remove_column
-    add_index
-    remove_index
-
-### Associations
-    
-    t.references :category   # kinda same as t.integer :category_id
-
-    # Can have different types
-    t.references :category, polymorphic: true
-
-### Add/remove columns
-  
-    $ rails generate migration RemovePartNumberFromProducts part_number:string
-
-    class RemovePartNumberFromProducts < ActiveRecord::Migration
-      def up
-        remove_column :products, :part_number
-      end
-     
-      def down
-        add_column :products, :part_number, :string
-      end
-    end
-
 Validation
 ----------