Datamapper中不区分大小写的查询

Question

I am new to Datamapper. Is there any way to write case insensitive query in datamapper because I am searching for presence of a name in a table with datamapper. Normally we write query in datamapper like this say,

Student.all(:name => "XYZ") where name can be of the form xyz, Xyz and XYZ.

So in the above query what additional operator I have to add to make the above query case insensitive.

Answer 1

对于数据映射器，您必须使用

Student.all(:conditions => [ "lower(name) = ?", name.downcase ])

Answer 2

Modify your query:

name = "XyZ"
Student.find(:all, :conditions => [ "lower(name) = ?", name.downcase ])

Answer 3

You can try this

name = "XyZ"
Student.where("lower(name) = ?", name.downcase)

or you can put validation in modal also like this

validates_uniqueness_of :name, :case_sensitive => false