Notes

To have the submit_tag send it's value within a nested resource for strong params use the name paramter.

submit_tag("Send", name: 'article[submit]')

Where it says: without loading a bunch of records should say: without loading a bunch of columns/attributes Considering that record usually is a row.

Note that the version of leente and timdorr are probably vulnerable to SQL Injection (through attribute param).

Probably you want to look into with_lock instead of handcrafting SQL.

it's a small point, but if you look at the source, the method is defined with the splat operator in the arguments: def select (*fields) this means that a list of arguments is automatically converted to an array. There is no typo in the description above.

It will also work to pass an array:...

Could this be used against a user supplied fragment like in a url route ?

If you're looking for with_scope replacement for newer versions, see http://apidock.com/rails/ActiveRecord/Relation/scoping

The group_method parameter can be a string representing a method chain:

grouped_collection_select(:city, :country_id, @continents, 'countries.sort.reverse', :name, :id, :name)

If we were to modify the Country model so we can sort by name:

class Country
include Comparable

def <=>(...

3rd example is a trap.

If you need to and processing with respect to a particular resource between 2 or more threads in more complicated ways, it is likely that ConditionVariable is what you're looking for.

To perform on search by LIKE:

==== SQL Query: SELECT users.* FROM users WHERE name LIKE 'Doug%';

==== Explain: # Without index Seq Scan on users (cost=0.00..82183.32 rows=98524 width=418) Filter: ((name)::text ~~ 'Doug%'::text)

==== Adding index with operator class 'varchar_patte...

Model.select(:field, :other_field, :and_one_more) has a typo. It must take an array of arguments as the description states:

Model.select([:field, :other_field, :and_one_more])

Using the class method #respond_to allows controller-level specification of the allowed mime-types. Without #respond_with , it enables a

Completed 406 Not Acceptable

response rather than

ActionView::MissingTemplate

error when an unsupported type is requested.

See: http://www.justinweiss...

==== Code example

def to_bdt(amount)
number_to_currency(amount, :unit => "BDT ", :separator => ".", :delimiter => ",")
end

Note that even if the arrays have the same content, the elements need to be ordered:

==== Example:

x = [1, 2, 3]
y = [3, 2, 1]
z = [1, 2, 3]

x.eql?(y) #=> false
x.eql?(z) #=> true
x.eql?(y.sort) #=> true

If the result returned from the block is an Integer, the output will include a message about that number of "rows" in addition to the elapsed time.

say_with_time "Some complex, custom work" do
counter = 0
# ... do some stuff here that increments the counter ...
counter
end...

If the result returned from the block is an Integer, the output will include a message about that number of "rows" in addition to the elapsed time.

say_with_time "Some complex, custom work" do
counter = 0
# ... do some stuff here that increments the counter ...
counter
end...

So I can find it when I look next time.

So that next time I look I find it.

A 404 error for the favicon will be thrown on pages where there is no layout if there isn't a favicon in the public folder.

A situation would be when a controller method is used to render an image and the user chooses to open the image in a new tab bypassing the layout and the favicon_link_tag.

Specify the data you're looking for. If it exists in the table, the first instance will be returned. If not, then create is called.

If a block is provided, that block will be executed only if a new instance is being created. The block is NOT executed on an existing record.

==== Cod...