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module RailsSqlViews
module ConnectionAdapters #:nodoc:
# Abstract definition of a View
class ViewDefinition
attr_accessor :columns, :select_query
def initialize(base, select_query)
@columns = []
@base = base
@select_query = select_query
end
def column(name)
column = name.to_s
@columns << column unless @columns.include? column
self
end
def to_sql
@columns.collect { |c| @base.quote_column_name(c) } * ', '
end
end
class MappingDefinition
# Generates a hash of the form :old_column => :new_column
# Initially, it'll map column names to themselves.
# use map_column to modify the list.
def initialize(columns)
@columns = columns
@map = Hash.new()
columns.each do |c|
@map[c] = c
end
end
# Create a mapping from an old column name to a new one.
# If the new name is nil, specify that the old column shouldn't
# appear in this new view.
def map_column(old_name, new_name)
unless @map.include?(old_name)
raise ActiveRecord::ActiveRecordError, "column #{old_name} not found, can't be mapped"
end
if new_name.nil?
@map.delete old_name
@columns.delete old_name
else
@map[old_name] = new_name
end
end
def select_cols
@columns
end
def view_cols
@columns.map { |c| @map[c] }
end
end
end
end
Version data entries
19 entries across 19 versions & 8 rubygems