Module: Searchlogic::ActiveRecord::Consistency

Included in:
ActiveRecord::Base
Defined in:
lib/searchlogic/active_record/consistency.rb

Overview

Active Record is pretty inconsistent with how their SQL is constructed. This method attempts to close the gap between the various inconsistencies.

Class Method Summary (collapse)

Instance Method Summary (collapse)

Class Method Details

+ (Object) included(klass)



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# File 'lib/searchlogic/active_record/consistency.rb', line 6

def self.included(klass)
  klass.class_eval do
    alias_method_chain :merge_joins, :singularity
    alias_method_chain :merge_joins, :consistent_conditions
    alias_method_chain :merge_joins, :merged_duplicates
  end
end

Instance Method Details

- (Object) merge_joins_with_consistent_conditions(*args)

This method ensures that the order of the conditions in the joins are the same. The strings of the joins MUST be exactly the same for AR to remove the duplicates. AR is not consistent in this approach, resulting in duplicate joins errors when combining scopes.



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# File 'lib/searchlogic/active_record/consistency.rb', line 27

def merge_joins_with_consistent_conditions(*args)
  joins = merge_joins_without_consistent_conditions(*args)
  joins.collect do |j|
    if j.is_a?(String) && (j =~ / (AND|OR) /i).nil?
      j.gsub(/(.*) ON (.*) = (.*)/) do |m|
        join, cond1, cond2 = $1, $2, $3
        sorted = [cond1.gsub(/\(|\)/, ""), cond2.gsub(/\(|\)/, "")].sort
        "#{join} ON #{sorted[0]} = #{sorted[1]}"
      end
    else
      j
    end
  end.uniq
end

- (Object) merge_joins_with_merged_duplicates(*args)



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# File 'lib/searchlogic/active_record/consistency.rb', line 43

def merge_joins_with_merged_duplicates(*args)
  args << "" if !Thread.current["searchlogic_delegation"]
  joins = merge_joins_without_merged_duplicates(*args)
end

- (Object) merge_joins_with_singularity(*args)

In AR multiple joins are sometimes in a single join query, and other times they are not. The merge_joins method in AR should account for this, but it doesn't. This fixes that problem. This way there is one join per string, which allows the merge_joins method to delete duplicates.



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# File 'lib/searchlogic/active_record/consistency.rb', line 18

def merge_joins_with_singularity(*args)
  joins = merge_joins_without_singularity(*args)
  joins.collect { |j| j.is_a?(String) ? j.split("  ") : j }.flatten.uniq
end