如何在文档字段MongoDB中找到相似性？(How to find similarity in document field MongoDB?)

 给定的数据如下： 
 
{'_id': 'foobar1',
 'about': 'similarity in comparison',
 'categories': ['one', 'two', 'three']}
{'_id': 'foobar2',
 'about': 'perfect similarity in comparison',
 'categories': ['one']}
{'_id': 'foobar3',
 'about': 'partial similarity',
 'categories': ['one', 'two']}
{'_id': 'foobar4',
 'about': 'none',
 'categories': ['one', 'two']}
 
 我想找到一种方法来获得单个项目与集合中所有其他项目之间的相似性，然后按照最高相似度的顺序返回它们。 相似性是基于共同的单词数，已经有一个int similar(String one, String two)的函数int similar(String one, String two) 
 
 例如：如果我想要foobar1 about字段的相似性列表，它将返回 
 
 [{'_id': 'foobar2'}, {'_id': 'foobar3'}, {'_id': 'foobar4'}] 
 
 我正在使用morphia这样做，但只有mongoDB实现，我可以想出其余部分 

Given data that looks like this: 
 
{'_id': 'foobar1',
 'about': 'similarity in comparison',
 'categories': ['one', 'two', 'three']}
{'_id': 'foobar2',
 'about': 'perfect similarity in comparison',
 'categories': ['one']}
{'_id': 'foobar3',
 'about': 'partial similarity',
 'categories': ['one', 'two']}
{'_id': 'foobar4',
 'about': 'none',
 'categories': ['one', 'two']}
 
I would like to find a way to get a similarity between a single item and all other items in the collection then return them in order of highest similarity. Similarity is based on number of words in common, there is already a function int similar(String one, String two)
 
For example: if I want the similarity list for about field of foobar1, it would return 
 
[{'_id': 'foobar2'}, {'_id': 'foobar3'}, {'_id': 'foobar4'}]
 
I am doing this with morphia, but with just the mongoDB implementation, I could figure the rest out

原文：https://stackoverflow.com/questions/38365414