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Size: 1.99 KB
Versions: 9
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Stored size: 1.99 KB
Contents
module HoboFields
module Model
class IndexSpec
def initialize(model, fields, options={})
@model = model
self.table = options.delete(:table_name) || model.table_name
self.fields = Array.wrap(fields).*.to_s
self.name = options.delete(:name) || model.connection.index_name(self.table, :column => self.fields)
self.unique = options.delete(:unique) || false
if options[:where]
self.where = "#{options.delete(:where)}"
self.where = "(#{self.where})" unless self.where.start_with?('(')
end
end
attr_accessor :table, :fields, :name, :unique, :where
# extract IndexSpecs from an existing table
def self.for_model(model, old_table_name=nil)
t = old_table_name || model.table_name
model.connection.indexes(t).map do |i|
self.new(model, i.columns, :name => i.name, :unique => i.unique, :where => i.where, :table_name => old_table_name) unless model.ignore_indexes.include?(i.name)
end.compact
end
def default_name?
name == @model.connection.index_name(table, :column => fields)
end
def to_add_statement(new_table_name)
r = "add_index :#{new_table_name}, #{fields.*.to_sym.inspect}"
r += ", :unique => true" if unique
r += ", :where => '#{self.where}'" if self.where.present?
if default_name?
check_name = @model.connection.index_name(self.table, :column => self.fields)
else
check_name = name
end
if check_name.length > @model.connection.index_name_length
r += ", :name => '#{name[0,@model.connection.index_name_length]}'"
$stderr.puts("WARNING: index name #{check_name} too long, trimming")
else
r += ", :name => '#{name}'" unless default_name?
end
r
end
def hash
[table, fields, name, unique, where].hash
end
def ==(v)
v.hash == hash
end
alias_method :eql?, :==
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems