A few days ago I got a question regarding the automatic identifiers of documents in Solr 4.0, because the method from Solr 3 was deprecated. Because of that we decided to write a quick post about how to use Solr to generate documents unique identifier in Solr 4.x.<\/p>\n\n\n\n\n\n
Our simple data structure (fields<\/em> section of the schema.xml<\/em> file) looks as follows:\n<\/p>\n In addition to that we’ve added the information about which field is the one that should contain unique identifiers. This was also done in schema.xml<\/em> file:\n<\/p>\n In addition to changes in the schema.xml<\/em> file, we need to modify the solrconfig.xml <\/em>file and introduce a proper UpdateRequestProcessorChain<\/em>, like the following one:\n<\/p>\n By doing this we inform Solr that we want the id<\/em> field contents to be automatically generated.<\/p>\n Let’s test what we did. In order to do that we will index a simple document by using the following command:\n<\/p>\n If everything went well the above document was indexed. In order to check what happened we will send a simple query and look at the results. In order to do that we use the following comand:\n<\/p>\n The result returned by Solr for the above command is as follows:\n<\/p>\n As we can see the unique identifier was automatically generated. Now if we would send the same indexing command once again:\n<\/p>\n And run the same query again:\n<\/p>\n We would get two documents in results, just like the following:\n<\/p>\n As you can see, the two above documents have different unique identifiers, so the functionality works.<\/p>","protected":false},"excerpt":{"rendered":" A few days ago I got a question regarding the automatic identifiers of documents in Solr 4.0, because the method from Solr 3 was deprecated. Because of that we decided to write a quick post about how to use Solr<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[27],"tags":[521,520,164],"class_list":["post-560","post","type-post","status-publish","format-standard","hentry","category-solr-en","tag-automatic","tag-identifier","tag-solr-2"],"_links":{"self":[{"href":"https:\/\/solr.pl\/en\/wp-json\/wp\/v2\/posts\/560","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/solr.pl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/solr.pl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/solr.pl\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/solr.pl\/en\/wp-json\/wp\/v2\/comments?post=560"}],"version-history":[{"count":1,"href":"https:\/\/solr.pl\/en\/wp-json\/wp\/v2\/posts\/560\/revisions"}],"predecessor-version":[{"id":561,"href":"https:\/\/solr.pl\/en\/wp-json\/wp\/v2\/posts\/560\/revisions\/561"}],"wp:attachment":[{"href":"https:\/\/solr.pl\/en\/wp-json\/wp\/v2\/media?parent=560"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/solr.pl\/en\/wp-json\/wp\/v2\/categories?post=560"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/solr.pl\/en\/wp-json\/wp\/v2\/tags?post=560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<fields>\n <field name=\"id\" type=\"string\" indexed=\"true\" stored=\"true\" required=\"true\" multiValued=\"false\" \/>\n <field name=\"name\" type=\"text_general\" indexed=\"true\" stored=\"true\"\/>\n <field name=\"_version_\" type=\"long\" indexed=\"true\" stored=\"true\"\/>\n<\/fields><\/pre>\n
<uniqueKey>id<\/uniqueKey><\/pre>\n
Solr configuration<\/h3>\n
<updateRequestProcessorChain>\n <processor class=\"solr.UUIDUpdateProcessorFactory\">\n <str name=\"fieldName\">id<\/str>\n <\/processor>\n <processor class=\"solr.LogUpdateProcessorFactory\" \/>\n <processor class=\"solr.RunUpdateProcessorFactory\" \/>\n<\/updateRequestProcessorChain><\/pre>\n
A simple test<\/h3>\n
curl -XPOST 'localhost:8983\/solr\/update?commit=true' --data-binary '<add><doc><field name=\"name\">Test<\/field><\/doc><\/add>' -H 'Content-type:application\/xml'<\/pre>\n
curl -XGET 'localhost:8983\/solr\/select?q=*:*&indent=true'<\/pre>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<response>\n <lst name=\"responseHeader\">\n <int name=\"status\">0<\/int>\n <int name=\"QTime\">0<\/int>\n <lst name=\"params\">\n <str name=\"indent\">true<\/str>\n <str name=\"q\">*:*<\/str>\n <\/lst>\n <\/lst>\n <result name=\"response\" numFound=\"1\" start=\"0\">\n <doc>\n <str name=\"name\">Test<\/str>\n <str name=\"id\">1cdee8b4-c42d-4101-8301-4dc350a4d522<\/str>\n <long name=\"_version_\">1439726523307261952<\/long>\n <\/doc>\n <\/result>\n<\/response><\/pre>\n
curl -XPOST 'localhost:8983\/solr\/update?commit=true' --data-binary '<add><doc><field name=\"name\">Test<\/field><\/doc><\/add>' -H 'Content-type:application\/xml'<\/pre>\n
curl -XGET 'localhost:8983\/solr\/select?q=*:*&indent=true'<\/pre>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<response>\n <lst name=\"responseHeader\">\n <int name=\"status\">0<\/int>\n <int name=\"QTime\">1<\/int>\n <lst name=\"params\">\n <str name=\"indent\">true<\/str>\n <str name=\"q\">*:*<\/str>\n <\/lst>\n <\/lst>\n <result name=\"response\" numFound=\"2\" start=\"0\">\n <doc>\n <str name=\"name\">Test<\/str>\n <str name=\"id\">1cdee8b4-c42d-4101-8301-4dc350a4d522<\/str>\n <long name=\"_version_\">1439726523307261952<\/long>\n <\/doc>\n <doc>\n <str name=\"name\">Test<\/str>\n <str name=\"id\">9bedcb5f-1b71-4ab7-80a9-9882a6bf319e<\/str>\n <long name=\"_version_\">1439726693819351040<\/long>\n <\/doc>\n <\/result>\n<\/response><\/pre>\n