Fixes #4263: Adds docs for apoc triggers helper functions

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.trigger.nodesByLabel.adoc

@@ -1,5 +1,5 @@
 ¦xref::overview/apoc.trigger/apoc.trigger.nodesByLabel.adoc[apoc.trigger.nodesByLabel icon:book[]] +
 
-``
+`apoc.trigger.nodesByLabel(labelEntries, label)` - function to filter labelEntries by label, to be used within a trigger kernelTransaction with `$assignedLabels`, `$removedLabels`, `$assigned/removedNodeProperties`.
 ¦label:function[]
 ¦label:apoc-extended[]

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.trigger.propertiesByKey.adoc

@@ -1,5 +1,5 @@
 ¦xref::overview/apoc.trigger/apoc.trigger.propertiesByKey.adoc[apoc.trigger.propertiesByKey icon:book[]] +
 
-``
+`apoc.trigger.propertiesByKey(propertyEntries, key)` - function to filter propertyEntries by property-key, to be used within a trigger kernelTransaction with `$assignedNode/RelationshipProperties` and `$removedNode/RelationshipProperties`. Returns [`old`,`new`,`key`,`node`,`relationship`].
 ¦label:function[]
 ¦label:apoc-extended[]

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.trigger.toNode-lite.csv

@@ -0,0 +1,2 @@
+¦signature
+¦apoc.trigger.nodesByLabel(labelEntries :: ANY?, label :: STRING?) :: (LIST? OF ANY?)

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.trigger.toNode.adoc

@@ -0,0 +1,5 @@
+¦xref::overview/apoc.trigger/apoc.trigger.toNode.adoc[apoc.trigger.toNode icon:book[]] +
+
+`apoc.trigger.toNode(node, removedLabels, removedNodeProperties)` - function to rebuild a node as a virtual, to be used in triggers with a not 'afterAsync' phase.
+¦label:function[]
+¦label:apoc-extended[]

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.trigger.toNode.csv

@@ -0,0 +1,2 @@
+¦type¦qualified name¦signature¦description
+¦function¦apoc.trigger.nodesByLabel¦apoc.trigger.nodesByLabel(labelEntries :: ANY?, label :: STRING?) :: (LIST? OF ANY?)¦

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.trigger.toRelationship-lite.csv

@@ -0,0 +1,2 @@
+¦signature
+¦apoc.trigger.nodesByLabel(labelEntries :: ANY?, label :: STRING?) :: (LIST? OF ANY?)

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.trigger.toRelationship.adoc

@@ -0,0 +1,5 @@
+¦xref::overview/apoc.trigger/apoc.trigger.toRelationship.adoc[apoc.trigger.toRelationship icon:book[]] +
+
+`apoc.trigger.toRelationship(rel, removedRelationshipProperties)` - function to rebuild a relationship as a virtual, to be used in triggers with a not 'afterAsync' phase.
+¦label:function[]
+¦label:apoc-extended[]

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.trigger.toRelationship.csv

@@ -0,0 +1,2 @@
+¦type¦qualified name¦signature¦description
+¦function¦apoc.trigger.nodesByLabel¦apoc.trigger.nodesByLabel(labelEntries :: ANY?, label :: STRING?) :: (LIST? OF ANY?)¦

docs/asciidoc/modules/ROOT/nav.adoc

@@ -79,6 +79,7 @@ include::partial$generated-documentation/nav.adoc[]
 
 * xref:background-operations/index.adoc[]
     ** xref::background-operations/apoc-load-directory-async.adoc[]
+    ** xref:background-operations/triggers.adoc[]
 
 * xref:database-introspection/index.adoc[]
     ** xref::database-introspection/config.adoc[]

docs/asciidoc/modules/ROOT/pages/background-operations/index.adoc

@@ -5,4 +5,5 @@
 
 It's possible to define listeners on one or more folders which trigger the executing of custom cypher queries if changes are observed:
 
-* xref::background-operations/apoc-load-directory-async.adoc[]
+* xref::background-operations/apoc-load-directory-async.adoc[]
+* xref:background-operations/triggers.adoc[]

docs/asciidoc/modules/ROOT/pages/background-operations/triggers.adoc

@@ -0,0 +1,16 @@
+APOC Core provides a set of procedures for running Cypher queries that are called when data in Neo4j is changed (created, updated, deleted).
+
+https://neo4j.com/docs/apoc/current/background-operations/triggers/[See here for more info].
+
+In addition, APOC Extended provides some helper procedures to more easily manipulate Cypher queries and solve some transaction use cases that cannot be solved otherwise.
+
+== Helper Functions
+
+[separator=¦,opts=header,cols="5,1m,1m"]
+|===
+¦Qualified Name¦Type¦Release
+include::example$generated-documentation/apoc.trigger.nodesByLabel.adoc[]
+include::example$generated-documentation/apoc.trigger.propertiesByKey.adoc[]
+include::example$generated-documentation/apoc.trigger.toNode.adoc[]
+include::example$generated-documentation/apoc.trigger.toRelationship.adoc[]
+|===

docs/asciidoc/modules/ROOT/pages/overview/apoc.trigger/apoc.trigger.toNode.adoc

@@ -0,0 +1,28 @@
+
+= apoc.trigger.toNode
+:description: This section contains reference documentation for the apoc.trigger.toNode function.
+
+label:function[] label:apoc-extended[]
+
+== Signature
+
+[source]
+----
+apoc.trigger.toNode(node :: NODE, removedLabels :: MAP, removedNodeProperties :: MAP) :: RELATIONSHIPH
+----
+
+== Input parameters
+[.procedures, opts=header]
+|===
+| Name | Type | Default 
+|node|NODE|null
+|removedLabels|MAP|null
+|removedNodeProperties|MAP|null
+|===
+
+[[usage-apoc.trigger.nodesByLabel]]
+== Usage Examples
+include::partial$usage/apoc.trigger.toNode.adoc[]
+
+xref::background-operations/triggers.adoc[More documentation of apoc.trigger.toNode,role=more information]
+

docs/asciidoc/modules/ROOT/pages/overview/apoc.trigger/apoc.trigger.toRelationship.adoc

@@ -0,0 +1,27 @@
+
+= apoc.trigger.toRelationship
+:description: This section contains reference documentation for the apoc.trigger.toRelationship function.
+
+label:function[] label:apoc-extended[]
+
+== Signature
+
+[source]
+----
+apoc.trigger.toRelationship(rel :: RELATIONSHIP, removedRelationshipProperties :: MAP) :: RELATIONSHIP
+----
+
+== Input parameters
+[.procedures, opts=header]
+|===
+| Name | Type | Default 
+|rel|RELATIONSHIP|null
+|removedRelationshipProperties|MAP|null
+|===
+
+[[usage-apoc.trigger.nodesByLabel]]
+== Usage Examples
+include::partial$usage/apoc.trigger.toRelationship.adoc[]
+
+xref::background-operations/triggers.adoc[More documentation of apoc.trigger.toNode,role=more information]
+

docs/asciidoc/modules/ROOT/partials/usage/apoc.trigger.nodesByLabel.adoc

@@ -6,14 +6,15 @@ create constraint for (p:Person)
 require p.id is unique;
 ----
 
-This function is used inside an apoc.trigger.add Cypher statement.
+This function is intended to be used inside an apoc.trigger.install Cypher statement.
 
 We can use it to conditionally run Cypher statements when labels are added or removed or when properties are added or removed.
 For example, we add an `id` property to all `Person` nodes that is the lower case value of the `name` property of that node, by defining the following trigger:
 
 [source,cypher]
 ----
-CALL apoc.trigger.add(
+CALL apoc.trigger.install(
+  'neo4j',
   'lowercase',
   'UNWIND apoc.trigger.nodesByLabel($assignedLabels,"Person") AS n
    SET n.id = toLower(n.name)',

docs/asciidoc/modules/ROOT/partials/usage/apoc.trigger.propertiesByKey.adoc

@@ -1,11 +1,12 @@
-This function is used inside an apoc.trigger.add.adoc Cypher statement.
+This function is intended to be used inside an apoc.trigger.install Cypher statement.
 
 We can use it to conditionally run Cypher statements when properties are added or removed.
 For example, we can connect nodes with a `genre` property to a `Genre` node, with the following trigger:
 
 [source,cypher]
 ----
-CALL apoc.trigger.add(
+CALL apoc.trigger.install(
+  'neo4j',
   'triggerTest',
   'UNWIND apoc.trigger.propertiesByKey($assignedNodeProperties, "genre") as prop
    WITH prop.node as n

docs/asciidoc/modules/ROOT/partials/usage/apoc.trigger.toNode.adoc

@@ -0,0 +1,46 @@
+This function is intended to be used within an `apoc.trigger.install` Cypher statement.
+
+If we want to create a 'before' or 'after' trigger query using `$deletedNodes`, and retrieve entity information such as labels and/or properties, we cannot use the classic Cypher functions labels() and properties().
+Instead, we have to leverage virtual nodes through the function `apoc.trigger.toNode(node, $removedLabels, $removedNodeProperties)`.
+
+For example, to create a new `Report` node with a list of deleted node IDs and all the labels retrieved for each deleted node, we can execute:
+[source,cypher]
+----
+CALL apoc.trigger.install(
+    'neo4j', 'myTrigger',
+    "UNWIND $deletedNodes as deletedNode
+    WITH apoc.trigger.toNode(deletedNode, $removedLabels, $removedNodeProperties) AS deletedNode
+    CALL apoc.merge.node(
+          ['Report'],
+          {labels: apoc.node.labels(deletedNode)},
+          {created: datetime()},
+          {updated: datetime()}
+    ) YIELD node AS report
+    WITH report, deletedNode
+    SET report.deletedIds = coalesce(report.deletedIds, [])+[id(deletedNode)]" ,
+    {phase:'before'}
+);
+----
+
+Now, let's create and delete a `Movie` node:
+
+[source,cypher]
+----
+CREATE (:Movie {title: "The White Tiger"});
+MATCH (movie:Movie {title: "The White Tiger"}) DELETE movie;
+----
+
+Finally, let's check the `Report` node:
+
+[source,cypher]
+----
+MATCH (report:Report {labels: ['Movie']})
+RETURN report;
+----
+
+.Results
+[opts="header"]
+|===
+| report
+| (:Report {"created": "2024-12-12T08:33:27.188000000Z", "deletedIds": [12], "labels": ["Movie"]})
+|===

docs/asciidoc/modules/ROOT/partials/usage/apoc.trigger.toRelationship.adoc

@@ -0,0 +1,48 @@
+This function is intended to be used within an `apoc.trigger.install` Cypher statement.
+
+If we want to create a 'before' or 'after' trigger query using `$deletedRelationships`, and retrieve entity information such as the type and/or properties, we cannot use the classic Cypher functions type() and properties().
+Instead, we have to leverage virtual relationships through the function `apoc.trigger.toRelationship(rel, $removedRelationshipProperties)`.
+
+For example, to create a new `Report` node with a list of deleted relationship IDs and the type retrieved for each deleted relationship, we can execute:
+[source,cypher]
+----
+CALL apoc.trigger.install(
+    'neo4j', 'myTrigger',
+    "UNWIND $deletedRelationships as deletedRel
+    WITH apoc.trigger.toRelationship(deletedRel, $removedRelationshipProperties) AS deletedRel
+    CALL apoc.merge.node(
+          ['Report'],
+          {type: apoc.rel.type(deletedRel)},
+          {created: datetime()},
+          {updated: datetime()}
+    ) YIELD node AS report
+    WITH report, deletedRel
+    SET report.deletedIds = coalesce(report.deletedIds, [])+[id(deletedRel)]" ,
+    {phase:'before'}
+);
+----
+
+Now, let's create and delete a `IN_GENRE` relationship between a `Movie` node and a `Genre` node:
+
+[source,cypher]
+----
+MERGE (movie:Movie {title: "The White Tiger"})
+MERGE (genre:Genre {name: "Triller"})
+MERGE (movie)-[IN_GENRE]->(genre);
+MATCH (movie:Movie {title: "The White Tiger"})-[r:IN_GENRE]->(genre:Genre {name: "Triller"}) DELETE r;
+----
+
+Finally, let's check the `Report` node:
+
+[source,cypher]
+----
+MATCH (report:Report {labels: ['IN_GENRE']})
+RETURN report;
+----
+
+.Results
+[opts="header"]
+|===
+| report
+| (:Report {"created": "2024-12-12T08:33:27.188000000Z", "deletedIds": [12], "type": "IN_GENRE"})
+|===