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Versions: 14
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Stored size: 1.15 KB
Contents
module ROM
module SQL
# @private
class Header
include Equalizer.new(:columns, :table)
attr_reader :columns, :table
def initialize(columns, table)
@columns = columns
@table = table
end
def to_ary
columns
end
alias_method :to_a, :to_ary
def to_h
columns.each_with_object({}) do |col, h|
left, right = col.to_s.split('___')
h[left.to_sym] = (right || left).to_sym
end
end
def names
columns.map { |col| :"#{col.to_s.split('___').last}" }
end
def project(*names)
self.class.new(columns.find_all { |col| names.include?(col) }, table)
end
def qualified
self.class.new(columns.map { |col| :"#{table}__#{col}" }, table)
end
def rename(options)
self.class.new(columns.map { |col|
new_name = options[col]
if new_name
:"#{col}___#{new_name}"
else
col
end
}, table)
end
def prefix(col_prefix)
rename(Hash[columns.map { |col| [col, :"#{col_prefix}_#{col}"] }])
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems