Class: ProductGroup

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
app/models/product_group.rb

Overview

ProductGroups are used for creating and managing sets of products. Product group can be either anonymous(adhoc) or named.

Anonymous Product groups are created by combining product scopes generated from url in 2 formats:

/t/*taxons/s/name_of_scope/comma_separated_arguments/name_of_scope_that_doesn_take_any//order
*/s/name_of_scope/comma_separated_arguments/name_of_scope_that_doesn_take_any//order

Named product groups can be created from anonymous ones, lub from another named scope (using ProductGroup.from_url method). Named product groups have pernament urls, that don’t change even after changes to scopes are made, and come in two types.

/t/*taxons/pg/named_product_group
*/pg/named_product_group

first one is used for combining named scope with taxons, named product group can have #in_taxon or #taxons_name_eq scope defined, result should combine both and return products that exist in both taxons.

ProductGroup#dynamic_products returns chain of named scopes generated from order and product scopes. So you can do counting, calculations etc, on resulted set of products, without retriving all records.

ProductGroup operates on named scopes defined for product in Scopes::Product, or generated automatically by Searchlogic

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.from_url(url) ⇒ Object

Testing utility: creates new ProductGroup from search permalink url. Follows conventions for accessing PGs from URLs, as decoded in routes



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# File 'app/models/product_group.rb', line 43

def self.from_url(url)
  pg = nil;
  case url
  when /\/t\/(.+?)\/s\/(.+)/  then taxons = $1; attrs = $2;
  when /\/t\/(.+?)\/pg\/(.+)/ then taxons = $1; pg_name = $2;
  when /(.*?)\/s\/(.+)/       then attrs = $2;
  when /(.*?)\/pg\/(.+)/      then pg_name = $2;
  else                        return(nil)
  end

  if pg_name && opg = ProductGroup.find_by_permalink(pg_name)
    pg = new.from_product_group(opg)
  elsif attrs
    attrs = url.split("/")
    pg = new.from_route(attrs)
  end
  taxon = taxons && taxons.split("/").last
  pg.add_scope("in_taxon", taxon) if taxon
  
  pg
end

.new_from_products(products, attrs = {}) ⇒ Object

Build a new product group with a scope to filter by specified products



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# File 'app/models/product_group.rb', line 202

def self.new_from_products(products, attrs = {})
  pg = new(attrs)
  pg.product_scopes.build(:name => 'with_ids', :arguments => [products.map(&:id).join(',')])
  pg
end

Instance Method Details

#add_scope(scope_name, arguments = []) ⇒ Object 



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# File 'app/models/product_group.rb', line 92

def add_scope(scope_name, arguments=[])
  self.product_scopes << ProductScope.new({
      :name => scope_name.to_s,
      :arguments => [*arguments]
    })
  self
end

#apply_on(scopish, use_order = true) ⇒ Object 



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# File 'app/models/product_group.rb', line 100

def apply_on(scopish, use_order = true)
  # There's bug in AR, it doesn't merge :order, instead it takes order
  # from first nested_scope so we have to apply ordering FIRST.
  # see #2253 on rails LH
  base_product_scope = scopish
  if use_order && !self.order_scope.blank? && Product.condition?(self.order_scope)
    base_product_scope = base_product_scope.send(self.order_scope)
  end

  return self.product_scopes.reject {|s|
           s.is_ordering?
         }.inject(base_product_scope){|result, scope|
           scope.apply_on(result)
         }
end

#dynamic_products(use_order = true) ⇒ Object

returns chain of named scopes generated from order scope and product scopes.



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# File 'app/models/product_group.rb', line 117

def dynamic_products(use_order = true)
  apply_on(Product.group_by_products_id, use_order)
end

#from_product_group(opg) ⇒ Object 



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# File 'app/models/product_group.rb', line 65

def from_product_group(opg)
  self.product_scopes = opg.product_scopes.map{|ps|
    ps = ps.clone;
    ps.product_group_id = nil;
    ps.product_group = self;
    ps
  }
  self
end

#from_route(attrs) ⇒ Object 



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# File 'app/models/product_group.rb', line 75

def from_route(attrs)
  self.order_scope = attrs.pop if attrs.length % 2 == 1
  attrs.each_slice(2) do |scope|
    next unless Product.condition?(scope.first)
    add_scope(scope.first, scope.last.split(","))
  end
  self
end

#from_search(search_hash) ⇒ Object 



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# File 'app/models/product_group.rb', line 84

def from_search(search_hash)
  search_hash.each_pair do |scope_name, scope_attribute|
    add_scope(scope_name, scope_attribute)
  end
  
  self
end

#generate_preview(size = ) ⇒ Object 



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# File 'app/models/product_group.rb', line 178

def generate_preview(size = Spree::Config[:admin_pgroup_preview_size])
  count = self.class.count_by_sql ["SELECT COUNT(*) FROM product_groups_products WHERE product_groups_products.product_group_id = ?", self]

  return count, products.limit(size)
end

#include?(product) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/product_group.rb', line 138

def include?(product)
  res = apply_on(Product.id_equals(product.id), false)
  res.count > 0
end

#order_scope ⇒ Object 



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# File 'app/models/product_group.rb', line 188

def order_scope
  if scope = product_scopes.detect {|s| s.is_ordering?}
    scope.name
  end
end

#order_scope=(scope_name) ⇒ Object 



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# File 'app/models/product_group.rb', line 193

def order_scope=(scope_name)
  if scope = product_scopes.detect {|s| s.is_ordering?}
    scope.update_attribute(:name, scope_name)
  else
    self.product_scopes.build(:name => scope_name, :arguments => [])
  end    
end

#products(use_order = true) ⇒ Object

Does the final ordering if requested TODO: move the order stuff out of the above - is superfluous now



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# File 'app/models/product_group.rb', line 123

def products(use_order = true)
  cached_group = Product.in_cached_group(self)
  if cached_group.limit(1).blank?
    dynamic_products(use_order)
  elsif !use_order
    cached_group
  else
    product_scopes.select {|s| 
      s.is_ordering?
    }.inject(cached_group) {|res,order| 
      order.apply_on(res)
    }
  end
end

#scopes_to_hash ⇒ Object 



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# File 'app/models/product_group.rb', line 143

def scopes_to_hash
  result = {}
  self.product_scopes.each do |scope|
    result[scope.name] = scope.arguments
  end
  result
end

#set_permalink ⇒ Object 



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# File 'app/models/product_group.rb', line 166

def set_permalink
  self.permalink = self.name.to_url
end

#to_s ⇒ Object 



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# File 'app/models/product_group.rb', line 184

def to_s
  "<ProductGroup" + (id && "[#{id}]").to_s + ":'#{to_url}'>"
end

#to_url ⇒ Object

generates ProductGroup url



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# File 'app/models/product_group.rb', line 152

def to_url
  if (new_record? || name.blank?)
    result = ""
    result+= self.product_scopes.map{|ps|
      [ps.name, ps.arguments.join(",")]
    }.flatten.join('/')
    result+= self.order_scope if self.order_scope
  
    result
  else
    name.to_url
  end
end

#update_memberships ⇒ Object 



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# File 'app/models/product_group.rb', line 170

def update_memberships
  # wipe everything directly to avoid expensive in-rails sorting
  ActiveRecord::Base.connection.execute "DELETE FROM product_groups_products WHERE product_group_id = #{self.id}"

  # and generate the new group entirely in SQL
  ActiveRecord::Base.connection.execute "INSERT INTO product_groups_products #{dynamic_products(false).scoped(:select => "products.id, #{self.id}").to_sql}"
end