Class: Item::ImageLibraryPlPcLadder

Inherits:
Object
  • Object
show all
Defined in:
app/services/item/image_library_pl_pc_ladder.rb

Overview

Fetches images in PL×PC ladder order (leaf-to-root on both axes):
For each product line node from the root PL's path (most specific first):

  • For each category node from the item's PC path (most specific first): exact PL + exact PC
  • Then: images linked to that PL only (no category filter), excluding already seen

Path order: +self_and_ancestors_ids+ is root→leaf; we +reverse+ to walk leaf→root (see
Models::LtreeLineage). Uses explicit +product_line_id+ / +product_category_id+ joins so the
planner can use btree FKs and GiST indexes on +product_lines.ltree_path_ids+ /
+product_categories.ltree_path_ids+.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(base_scope:, item:, exclude_ids:, limit:) ⇒ ImageLibraryPlPcLadder

Returns a new instance of ImageLibraryPlPcLadder.



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# File 'app/services/item/image_library_pl_pc_ladder.rb', line 17

def initialize(base_scope:, item:, exclude_ids:, limit:)
  @base_scope = base_scope
  @item = item
  @exclude_ids = exclude_ids
  @limit = limit
end

Class Method Details

.fetch(base_scope, item, exclude_ids: [], limit: 200) ⇒ Object 



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# File 'app/services/item/image_library_pl_pc_ladder.rb', line 13

def self.fetch(base_scope, item, exclude_ids: [], limit: 200)
  new(base_scope: base_scope, item: item, exclude_ids: exclude_ids, limit: limit).fetch
end

Instance Method Details

#fetch ⇒ Object 



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# File 'app/services/item/image_library_pl_pc_ladder.rb', line 24

def fetch
  @seen = Set.new(@exclude_ids)
  @out = []
  run_primary_ladder if @item.primary_product_line
  run_secondary_ladders
  @out.take(@limit)
end