Updates.

activeadmin.md

@@ -0,0 +1,67 @@
+title: ActiveAdmin
+---
+
+### Listing scopes
+
+Allows you to filter listings by a certain scope.
+
+    scope :draft
+    scope :for_approval
+
+### Sidebar filters
+
+    filter :email
+    filter :username
+
+### Custom actions
+
+You can define custom actions for models.
+
+    before_filter only: [:show, :edit, :publish] do
+      @post = Post.find(params[:id])
+    end
+
+Make the route:
+
+    member_action :publish, method: :put do
+      @post.publish!
+      redirect_to admin_posts_path, notice: "The post '#{@post}' has been published!"
+    end
+
+Link it in the index:
+
+    index do
+      column do |post|
+        link_to 'Publish', publish_admin_post_path(post), method: :put
+      end
+    end
+
+And link it in show/edit:
+
+    action_item only: [:edit, :show] do
+      @post = Post.find(params[:id])
+      link_to 'Publish', publish_admin_post_path(post), method: :put
+    end
+
+### Columns
+
+    column :foo
+
+    column :title, sortable: :name do |post|
+      strong post.title
+    end
+
+### Other helpers
+
+    # Grey, green, orange, red
+    status_tag "Done"
+    status_tag "Finished", :ok
+    status_tag "You", :warn
+    status_tag "Failed", :error
+
+### Disabling 'new post'
+
+    ActiveAdmin.register Post do
+      actions :index, :edit
+      # or: config.clear_action_items!
+    end

canvas.md

@@ -8,16 +8,43 @@
     // x = 10, y = 20, width = 200, height = 100
     c.fillStyle = '#ff0000';
     c.strokeStyle = '#ff00ff';
+
     c.lineWidth = 5;
     c.lineCap = 'round';
+
     c.fillRect(10, 20, 200, 100);
+
     c.stroke();
+    c.fill();
+
+### Saving and restoring
+
+    c.save();
+
+    // Saves:
+    // strokeStyle fillStyle globalAlpha lineWidth lineCap lineJoin miterLimit 
+    // shadowOffsetX shadowOffsetY shadowBlur shadowColor
+    // globalCompositeOperation
+    // Transformations: translate rotate scale transform setTransform
+    // Clipping path
+
+    c.restore();
+
+### Transformations
+
+    c.translate(0, 0)
+    c.rotate(Math.PI*2/5)
+    c.scale(1.0, 1.0)
+
+See [MDN: Transformations][xform].
 
 ### Image drawing
 
     c.drawImage(image, dx, dy, [dw, dh]);
     /* `image` can be HTML Image/Canvas/Video */
 
+See [MDN: Images][images].
+
 ### Colors, styles shadows
 
     c.strokeStyle = '#ff00ff';
@@ -28,6 +55,8 @@
     c.shadowOffsetBlur = 3.0;
     c.shadowColor = 'rgba(0,0,0,0.2)';
 
+See [MDN: Styles][styles].
+
 ### Gradients
 
     gr = c.createLinearGgadient(x0,y0,x1,y1)
@@ -47,12 +76,11 @@
     c.arc(...)
     c.closePath()
 
-### Text
+### More resources
 
+  * [Canvas Cheatsheet PDF][pdf]
 
-
-### Resources
-
-  * [Canvas Cheatsheet PDF][cc]
-[cc]: http://www.nihilogic.dk/labs/canvas_sheet/HTML5_Canvas_Cheat_Sheet.pdf
-
+[pdf]: http://www.nihilogic.dk/labs/canvas_sheet/HTML5_Canvas_Cheat_Sheet.pdf
+[xform]: https://developer.mozilla.org/en-US/docs/Canvas_tutorial/Transformations
+[styles]: https://developer.mozilla.org/en-US/docs/Canvas_tutorial/Applying_styles_and_colors
+[images]: https://developer.mozilla.org/en-US/docs/Canvas_tutorial/Using_images

pry.md

@@ -0,0 +1,80 @@
+title: Pry
+--
+
+### cd / ls
+
+    > cd Array
+
+    > ls
+    Array.methods: [] try_convert
+    Array#methods: & * + abbrev assoc at ...
+
+    > ls         # All
+
+    > ls -m      # Methods
+    > ls -M      # Instance methods
+
+    > ls -g      # Globals
+    > ls -l      # Local vars
+    > ls -c      # Constants
+
+    > ls -i      # Instance vars
+
+    > ls -G xx   # Grey by regex
+
+### Shell integration
+
+shell-mode adds dir to the prompt
+
+    pry(main)> shell-mode
+    pry(main):/home/x $
+
+Commands with `.` are shell commands
+
+   pry(main)> .cat hello.txt
+
+### Inspection
+
+   > show-method Array#select
+
+   > ri Array#each
+   > cd Gem
+   > show-doc try_activate
+
+Finding
+
+   > find-method each
+   Array#each
+   Array#each_index
+   Enumerable#each_slice
+   ...
+
+### Editing
+
+   > edit-method Pry#repl
+
+### Gems
+
+   > gem-cd foo      # Switch to gem's dir
+   > gem-install foo
+   > gem-list
+
+### Misc commands
+
+   > hist          # History
+   > wtf?          # Trace of recent exception
+
+### Rails console
+
+   $ pry -r ./config/environment
+
+### Bonus: hirb
+
+   > table User.all
+   > view User.all
+   > view User.all, fields: %w[id name email]
+
+### Reference
+
+ * [Pry](https://github.com/pry/pry)
+ * [Hirb](https://github.com/cldwalker/hirb)

rails-models.md

@@ -203,8 +203,12 @@ API
     item.valid?
     item.invalid?
 
+ * [Guides: callbacks](http://guides.rubyonrails.org/active_record_validations_callbacks.html)
 
-http://guides.rubyonrails.org/active_record_validations_callbacks.html
+### Sorting
+
+    posts.order(:title)
+    posts.order(:title).reverse
 
 ### Mass updates