From 7aabaac0f5ba108f917af2c65a79511694393b85 Mon Sep 17 00:00:00 2001
From: Pratik Naik <pratiknaik@gmail.com>
Date: Wed, 30 Dec 2009 13:28:26 +0530
Subject: Organize Relation methods into separate modules

---
 activerecord/lib/active_record/relation.rb | 240 +----------------------------
 1 file changed, 1 insertion(+), 239 deletions(-)

(limited to 'activerecord/lib/active_record/relation.rb')

diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index 52d66dc20a..ae03e1d7e9 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -1,6 +1,6 @@
 module ActiveRecord
   class Relation
-    include RelationalCalculations
+    include QueryMethods, FinderMethods, CalculationMethods
 
     delegate :to_sql, :to => :relation
     delegate :length, :collect, :map, :each, :all?, :to => :to_a
@@ -32,119 +32,6 @@ module ActiveRecord
 
     alias :& :merge
 
-    def preload(*associations)
-      spawn.tap {|r| r.preload_associations += Array.wrap(associations) }
-    end
-
-    def eager_load(*associations)
-      spawn.tap {|r| r.eager_load_associations += Array.wrap(associations) }
-    end
-
-    def readonly(status = true)
-      spawn.tap {|r| r.readonly = status }
-    end
-
-    def select(selects)
-      if selects.present?
-        relation = spawn(@relation.project(selects))
-        relation.readonly = @relation.joins(relation).present? ? false : @readonly
-        relation
-      else
-        spawn
-      end
-    end
-
-    def from(from)
-      from.present? ? spawn(@relation.from(from)) : spawn
-    end
-
-    def having(*args)
-      return spawn if args.blank?
-
-      if [String, Hash, Array].include?(args.first.class)
-        havings = @klass.send(:merge_conditions, args.size > 1 ? Array.wrap(args) : args.first)
-      else
-        havings = args.first
-      end
-
-      spawn(@relation.having(havings))
-    end
-
-    def group(groups)
-      groups.present? ? spawn(@relation.group(groups)) : spawn
-    end
-
-    def order(orders)
-      orders.present? ? spawn(@relation.order(orders)) : spawn
-    end
-
-    def lock(locks = true)
-      case locks
-      when String
-        spawn(@relation.lock(locks))
-      when TrueClass, NilClass
-        spawn(@relation.lock)
-      else
-        spawn
-      end
-    end
-
-    def reverse_order
-      relation = spawn
-      relation.instance_variable_set(:@orders, nil)
-
-      order_clause = @relation.send(:order_clauses).join(', ')
-      if order_clause.present?
-        relation.order(reverse_sql_order(order_clause))
-      else
-        relation.order("#{@klass.table_name}.#{@klass.primary_key} DESC")
-      end
-    end
-
-    def limit(limits)
-      limits.present? ? spawn(@relation.take(limits)) : spawn
-    end
-
-    def offset(offsets)
-      offsets.present? ? spawn(@relation.skip(offsets)) : spawn
-    end
-
-    def on(join)
-      spawn(@relation.on(join))
-    end
-
-    def joins(join, join_type = nil)
-      return spawn if join.blank?
-
-      join_relation = case join
-      when String
-        @relation.join(join)
-      when Hash, Array, Symbol
-        if @klass.send(:array_of_strings?, join)
-          @relation.join(join.join(' '))
-        else
-          @relation.join(@klass.send(:build_association_joins, join))
-        end
-      else
-        @relation.join(join, join_type)
-      end
-
-      spawn(join_relation).tap { |r| r.readonly = true }
-    end
-
-    def where(*args)
-      return spawn if args.blank?
-
-      if [String, Hash, Array].include?(args.first.class)
-        conditions = @klass.send(:merge_conditions, args.size > 1 ? Array.wrap(args) : args.first)
-        conditions = Arel::SqlLiteral.new(conditions) if conditions
-      else
-        conditions = args.first
-      end
-
-      spawn(@relation.where(conditions))
-    end
-
     def respond_to?(method, include_private = false)
       return true if @relation.respond_to?(method, include_private) || Array.method_defined?(method)
 
@@ -189,47 +76,6 @@ module ActiveRecord
 
     alias all to_a
 
-    def find(*ids, &block)
-      return to_a.find(&block) if block_given?
-
-      expects_array = ids.first.kind_of?(Array)
-      return ids.first if expects_array && ids.first.empty?
-
-      ids = ids.flatten.compact.uniq
-
-      case ids.size
-      when 0
-        raise RecordNotFound, "Couldn't find #{@klass.name} without an ID"
-      when 1
-        result = find_one(ids.first)
-        expects_array ? [ result ] : result
-      else
-        find_some(ids)
-      end
-    end
-
-    def exists?(id = nil)
-      relation = select("#{@klass.quoted_table_name}.#{@klass.primary_key}").limit(1)
-      relation = relation.where(@klass.primary_key => id) if id
-      relation.first ? true : false
-    end
-
-    def first
-      if loaded?
-        @records.first
-      else
-        @first ||= limit(1).to_a[0]
-      end
-    end
-
-    def last
-      if loaded?
-        @records.last
-      else
-        @last ||= reverse_order.limit(1).to_a[0]
-      end
-    end
-
     def size
       loaded? ? @records.length : count
     end
@@ -307,93 +153,9 @@ module ActiveRecord
       end
     end
 
-    def find_by_attributes(match, attributes, *args)
-      conditions = attributes.inject({}) {|h, a| h[a] = args[attributes.index(a)]; h}
-      result = where(conditions).send(match.finder)
-
-      if match.bang? && result.blank?
-        raise RecordNotFound, "Couldn't find #{@klass.name} with #{conditions.to_a.collect {|p| p.join(' = ')}.join(', ')}"
-      else
-        result
-      end
-    end
-
-    def find_or_instantiator_by_attributes(match, attributes, *args)
-      guard_protected_attributes = false
-
-      if args[0].is_a?(Hash)
-        guard_protected_attributes = true
-        attributes_for_create = args[0].with_indifferent_access
-        conditions = attributes_for_create.slice(*attributes).symbolize_keys
-      else
-        attributes_for_create = conditions = attributes.inject({}) {|h, a| h[a] = args[attributes.index(a)]; h}
-      end
-
-      record = where(conditions).first
-
-      unless record
-        record = @klass.new { |r| r.send(:attributes=, attributes_for_create, guard_protected_attributes) }
-        yield(record) if block_given?
-        record.save if match.instantiator == :create
-      end
-
-      record
-    end
-
-    def find_one(id)
-      record = where(@klass.primary_key => id).first
-
-      unless record
-        conditions = where_clause(', ')
-        conditions = " [WHERE #{conditions}]" if conditions.present?
-        raise RecordNotFound, "Couldn't find #{@klass.name} with ID=#{id}#{conditions}"
-      end
-
-      record
-    end
-
-    def find_some(ids)
-      result = where(@klass.primary_key => ids).all
-
-      expected_size =
-        if @relation.taken && ids.size > @relation.taken
-          @relation.taken
-        else
-          ids.size
-        end
-
-      # 11 ids with limit 3, offset 9 should give 2 results.
-      if @relation.skipped && (ids.size - @relation.skipped < expected_size)
-        expected_size = ids.size - @relation.skipped
-      end
-
-      if result.size == expected_size
-        result
-      else
-        conditions = where_clause(', ')
-        conditions = " [WHERE #{conditions}]" if conditions.present?
-
-        error = "Couldn't find all #{@klass.name.pluralize} with IDs "
-        error << "(#{ids.join(", ")})#{conditions} (found #{result.size} results, but was looking for #{expected_size})"
-        raise RecordNotFound, error
-      end
-    end
-
     def where_clause(join_string = "\n\tAND ")
       @relation.send(:where_clauses).join(join_string)
     end
 
-    def reverse_sql_order(order_query)
-      order_query.to_s.split(/,/).each { |s|
-        if s.match(/\s(asc|ASC)$/)
-          s.gsub!(/\s(asc|ASC)$/, ' DESC')
-        elsif s.match(/\s(desc|DESC)$/)
-          s.gsub!(/\s(desc|DESC)$/, ' ASC')
-        else
-          s.concat(' DESC')
-        end
-      }.join(',')
-    end
-
   end
 end
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