Module Sequel::ColumnsIntrospection
In: lib/sequel/extensions/columns_introspection.rb

Methods

columns  

Public Instance methods

Attempt to guess the columns that will be returned if there are columns selected, in order to skip a database query to retrieve the columns. This should work with Symbols, SQL::Identifiers, SQL::QualifiedIdentifiers, and SQL::AliasedExpressions.

[Source]

    # File lib/sequel/extensions/columns_introspection.rb, line 28
28:     def columns
29:       return @columns if @columns
30:       return columns_without_introspection unless cols = opts[:select] and !cols.empty?
31:       probable_columns = cols.map{|c| probable_column_name(c)}
32:       if probable_columns.all?
33:         @columns = probable_columns
34:       else
35:         columns_without_introspection
36:       end
37:     end

[Validate]