sql - Rails: Eager loading and advanced query on has_many :through -

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Overview

Whenever a new product is added to the database, So to determine whether it is a potential duplicate, it is examined against all existing products of the database. If a newly added product is found to be a potential duplicate, then a duplicate warning association is created for the newly added product (pending_product_id), and potential match (existing_product_id). In addition, an integer match score is stored on duplicate warning, which indicates the strength of probable matching between the two products.

Model 

  class product & lt; ActiveRecord :: Base has_many: matches, through :: duplicate_warnings, source :: current_product has_many: duplicate_warnings, foreign_key: "pending_product_id", Depend on dependent :: and class duplicate alarms & lt; ActiveRecord :: Connected to Base: Pending Product, Category_name: "Product" related_to: existing_product, class_name: "product" end   
  problem   < P> How can I create the following question, and I can also include curious loading?  
 Find products similar to some product variables where Product.duplicate_warnings.match_score & lt; 5  and make sure there is no duplicate warning with the match score in the same product & gt; 5?   
 For example, something like this:  
 Products where product.status == 0 and product.product == "Toyota" and Product.duplicate_warnings.match_score & lt ; 5 And make sure that the product matches match_core and gt; There is no duplicate warning with. 5?   
 
 
 Do you want to load curious in your case? It will inquire about the products that follow your circumstances.    Product.joins (: duplicate_warnings). Selection ("Product. *, Maximum (duplicate_warnings.max_score) max_score"). Where (status: 0, manufacturer: "Toyota"). Group ("products.id"). ("Duplicate_warnings match_core)" 5 ")   
 but it will not be anxious load duplicate_warning so you will need more than one query.  
 Alternatively, You can find all the products you want to exclude from before:  
  exclude_product_ids = duplicateWarning.where ("match_score> 5") group ("pending_product_id"). (( Pending_product_id)   
 and then load them with associations: Product. An ([ "status = 0 and = manufacturer (Toyota and ID?) Include", Exclude_product_ids]). (: Dupliket_warnins)

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