Return nil from read_attribute(:foo) if 'foo' is not present in the @attributes hash, but the _foo method has been defined. This brings the behaviour into line with the 3-0-stable branch and the master branch before 93641ed6 (there were previously no assertions about this which is why the change slipped through). Note that actually calling the 'foo' method will still raise an error if the attribute is not present.

Undo performances regressions I introduced in bbe0a507 and add test for an edge case. Add comments to explain the intent of the code.

Remove unnecessary code from define_read_method and add assertion to make sure the underscored version is actually generated

bcrypt will encrypt anything, so validate_presence_of would not catch nil / blank passwords.  Thank you to Aleksander Kamil Modzelewski for reporting this

Extract the constraint-building for joins in JoinAssociation into a separate method to make it easy to change/override (requested by Ernie Miller so that MetaWhere can add to it easily)

Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

The controller and resource generators will now automatically produce asset stubs (this can be turned off with --skip-assets). These stubs will use Coffee and Sass, if those libraries are available. [DHH]

as the confirmation validation already adds that attr_accessor

old:
Hash.from_xml("<tag foo='bar'>\n</tag>")
=> {"tag"=>"\n"}

new:
Hash.from_xml("<tag foo='bar'>\n</tag>")
=> {"tag"=>{"foo"=>"bar", "__content__"=>"\n"}

[#6625 state:committed]
Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

- Closes #6692
Signed-off-by: NJosé Valim <jose.valim@gmail.com>