Module: SimpleNestedSetPatchArel1

Defined in:
lib/simple_nested_set/patches/arel_table_initialization.rb

Overview

actual patches patch for Arel 1.0.1

Instance Method Summary collapse

Instance Method Details

#as(table_alias) ⇒ Object 



59
60
61
62
 
# File 'lib/simple_nested_set/patches/arel_table_initialization.rb', line 59

def as(table_alias)
  @options ||= {}
  Arel::Table.new(name, options.merge(:as => table_alias))
end

#initialize(name, options = {}) ⇒ Object

Arel 1.0.0.rc1 Arel::Table#initialize and #table_exists? does not support instantiating an Arel::Table before the database table has been created.

This happens in adva-cms2 during the setup of the cucumber test application where the environment has to be loaded (and thus models will be loaded) and migrations will only be run afterwards.

see github.com/rails/arel/commit/19c5a95f1093653d2628dfb2f53637b0425dbba4#commitcomment-133903

Also, in Arel 1.0.0.rc1 Arel::Table#initialize @options won’t be initialized if the second argument is an engine, so #as will crash subsequently.

These issues have been fixed in:

github.com/svenfuchs/arel/commit/4b476404cbbecfedc255039c66c6eececb667d7f github.com/svenfuchs/arel/commit/3b1b24551106bc116cba404c992b513c5fbd137b



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
 
# File 'lib/simple_nested_set/patches/arel_table_initialization.rb', line 22

def initialize(name, options = {})
  @name = name.to_s
  @table_exists = nil
  @table_alias = nil
  @christener = Arel::Sql::Christener.new
  @attributes = nil
  @matching_attributes = nil

  if options.is_a?(Hash)
    @options = options
    @engine = options[:engine] || Arel::Table.engine

    if options[:as]
      as = options[:as].to_s
      @table_alias = as unless as == @name
    end
  else
    @engine = options # Table.new('foo', engine)
    @options = {}
  end

  if @engine.connection
    begin
      require "arel/engines/sql/compilers/#{@engine.adapter_name.downcase}_compiler"
    rescue LoadError
      begin
        # try to load an externally defined compiler, in case this adapter has defined the compiler on its own.
        require "#{@engine.adapter_name.downcase}/arel_compiler"
      rescue LoadError
        raise "#{@engine.adapter_name} is not supported by Arel."
      end
    end

    @@tables ||= engine.connection.tables
  end
end

#table_exists? ⇒ Boolean

Returns:

  • (Boolean) 


64
65
66
 
# File 'lib/simple_nested_set/patches/arel_table_initialization.rb', line 64

def table_exists?
  @table_exists ||= @@tables.include?(name) || engine.connection.table_exists?(name)
end