Select documents based on criteria that is located in different documents. You have Template Driven Extraction (TDE) templates that extract data from both document types into views.
Applies to MarkLogic versions 9+
This recipe assumes that you have two types of documents: one describing factories and one describing events (problems) that happen at those factories. A TDE template has extracted a factory ID and the state where the factory is located into the
factories view of the
manufacturing schema. Another template has extracted columns from the events documents:
factoryFKey (factory foreign key),
severity (of the event), and
status (‘Active’ or ‘Resolved’). These columns are in the
const op = require('/MarkLogic/optic'); const docId = op.fragmentIdCol('docId'); op.fromView('manufacturing', 'events') .where( op.and( op.eq(op.col('severity'), 1), op.eq(op.col('status'), 'Active') )) .groupBy('factoryFKey') .joinInner( op.fromView('manufacturing', 'factories', null, docId), op.on('factoryFKey', 'factoryID') ) .joinDoc('doc', docId) .select('doc') .result();
import module namespace op="https://marklogic.com/optic" at "/MarkLogic/optic.xqy"; let $doc-id := op:fragment-id-col('docId') return op:from-view('manufacturing', 'events') => op:where( op:and( op:eq(op:col('severity'), 1), op:eq(op:col('status'), 'Active') )) => op:group-by('factoryFKey') => op:join-inner( op:from-view('manufacturing', 'factories', (), $doc-id), op:on('factoryFKey', 'factoryID') ) => op:join-doc('doc', $doc-id) => op:select('doc') => op:result()
Required Indexes: row index populated with two views
The desired result from this query is the set of factory documents that have a severity 1, active event going on. The severity and status are in the
events view, so we need to join the views to get to the information we want.
The query starts with the
events view, as that is where the filtering criteria are found. The
where clause limits the rows that we need to work with prior to doing the join, which is based on the factory ID columns. This early scoping is important for performance.
Once the selection is made and the join between the views is done, we join with the documents. Notice that as part of the joinInner, the op.fromView that connects to the
factories view refers to
docId. This is how the joinDoc call knows which document to retrieve.
The final step is to select the
doc column and return just that. Optic will return a Sequence, which your code can then iterate over.
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