Neo4j

I believe there is a mistake in Chapter 2: Installation [1]. The following command didn't work: :GET http://localhost:7474/rdf/n10s/ping But this did: :GET http://localhost:7474/rdf/ping -- Christophe [1] Chapter 2. Installation - Neosemantics(n10s) User Guide ... View more

In http://guides.neo4j.com/4.0-intro-neo4j-exercises/06.html the problem in exercise 6.3 should also mention to return the name of the movie too. The page currently says: Retrieve all people who reviewed a movie, returning the list of reviewers and how many reviewers reviewed the movie. Better wording would be: Given all people who reviewed a movie, return the name of the movie, the list of reviewer names and how many reviewers reviewed the movie. ... View more

On page: http://guides.neo4j.com/4.0-intro-neo4j-exercises/05.html Exercise 5.6 Blockquote Write a Cypher query to retrieve all people in the graph whose name begins with Tom and optionally retrieve all people named Tom who directed a movie. And the answer is: MATCH (p:Person) WHERE p.name STARTS WITH 'Tom' OPTIONAL MATCH (p)-[:DIRECTED]->(m:Movie) RETURN p.name, m.title I think the Question would be better worded as: Return all persons who's name begins with Tom and optionally return the name of a movie that this person directed. ... View more

http://guides.neo4j.com/4.0-intro-neo4j-exercises/03.html First: Labels in Relationships are different from Labels in Nodes (in particular a Node can have 0,1, or more Labels). One exercise shows: MATCH (m:Movie)-[rel]-(:Person {name: 'Tom Hanks'}) RETURN m.title, type(rel) where type(rel) is how you get the one Label for a relationship. One might naively expect to use type() for Nodes, but that is wrong. You need the function labels() . (It's a bit bit confusing since Label refers to both Nodes and Relationships.). So this is how you would get all the Labels for a Movie Node. Since in the Movies DB, movies only have one sort of Label this would return a list of just one Label: MATCH (m:Movie)-[rel]-(:Person {name: 'Tom Hanks'}) RETURN m.title, labels(m) Second: For the query: MATCH (m:Movie)-[rel:ACTED_IN]-(:Person {name: 'Tom Hanks'}) RETURN m.title, rel.roles it would be good to point out there are some movies where Tom Hanks placed multiple roles. Hence the roles property is actually a Neo4J List . One interesting query is to order the movies where Hanks had the most roles: MATCH (m:Movie)<-[rel:ACTED_IN]-(:Person {name: 'Tom Hanks'}) RETURN size(rel.roles) AS Size, m.title, rel.roles ORDER BY Size DESC ... View more

In the neo4j tutorial, on page: http://guides.neo4j.com/4.0-intro-neo4j-exercises/01.html after the query MATCH(p:Person) RETURN p is run, there is the statement (emphasis mine): Notice also, that no relationships are displayed. That is because most Person nodes have no relationships with other Person nodes. This was probably true years ago, when the Movie DB was first created, but now with the :FOLLOWS relationship added to make the DB more interesting, the statement should be something like: Notice also, that almost no relationships are displayed. That is because only a very few Person nodes have the relationship FOLLOWS: with other Person nodes. I also suggest the changing "most" to "only a very few" ... View more

The documentation for FOREACH seems incomplete: FOREACH - Neo4j Cypher Manual. e.g. it's missing REMOVE as a possible command inside FOREACH . I was doing trial and error with FOREACH and I discovered a bad syntax error message. (don't laugh...). I tried out this code: MATCH (boo:Bucket {Name:"boo"}) MATCH (b:Bucket) FOREACH (key in keys(boo) | toUpper(b[key])) RETURN 2 and I got this error msg: Invalid input 'toUpper': expected "RETURN" "CREATE" "DELETE" "SET" "REMOVE" "DETACH" "MATCH" "WITH" "UNWIND" "USE" "CALL" "LOAD" "FROM" "FOREACH" "MERGE" "OPTIONAL" (line 3, column 31 (offset: 85)) "FOREACH (key in keys(boo) | toUpper(b[key]))" but I know that list is wrong for FOREACH because I've seen in a number of places where people are warning that MATCH cannot be used inside FOREACH . (The documentation should probably make that explicit.) When I tweak the code: MATCH (boo:Bucket {Name:"boo"}) MATCH (b:Bucket) FOREACH (key in keys(boo) | RETURN toUpper(b[key])) I get Neo.ClientError.Statement.SyntaxError with a pointer to RETURN . So, the first error message is wrong in claiming RETURN and MATCH are possible. In this post, it is noted that REMOVE (which is not mentioned in the documentation) is allowed but that APOC CALL s are not. Matching nodes in a nested FOREACH Cypher Can we use APOC call inside forEACH? I presume if DELETE is allowed then DETACH should be. Now I am not sure what the complete list of allowed commands inside a FOREACH actually is. So, the error message needs to be updated to include only the allowed commands inside FOREACH as well as the documentation. (I'm not sure why there such restrictions on FOREACH .) ... View more

I made a suggestion for the page: Neo4j Graph Database Platform CREATE - Neo4j Cypher Manual The `CREATE` clause is used to create nodes and relationships. After I submitted my suggestion, I got a the message: Thank you for your feedback! We will take this information into account while updating our documentation. You can also help us by . and there is no link for editing after the word "by". I would gladly add a Pull Request (PR) for this page but there's no link to follow. ... View more

After looking at various questions posted on the forum, I have noticed that a big stumbling block for newbies is that it appears that the parameter signature notation is not explained. (At least, I haven't been able to find it.) If the parameter signature notation page does exist, then each APOC documentation page should have a link to that page. For example from one of the simpler APOC functions: Neo4j Graph Database Platform apoc.coll.max - APOC Documentation This section contains reference documentation for the apoc.coll.max function. apoc.coll.max(values :: LIST? OF ANY?) :: (ANY?) double colon :: isn't explained, nor ANY or the ? As a long time programmer, I can guess what the notation is (especially after looking at the examples). However, newbies are often intimidated by this, which is unfortunate, because APOC gives Neo4J a major advantage over other DB systems. (I'm managing fine. I'm posting this for the newbies who are struggling.) ... View more

Hi, I am following these docs: https://neo4j.com/docs/operations-manual/current/cloud-deployments/neo4j-aws/automation-aws/#_deploying_neo4j_community_standalone, and the script provided is not working. The error message thrown is "S3 Error: Access Denied". The S3 URL it is trying to access is this one http://neo4j-cloudformation.s3.amazonaws.com/neo4j-community-standalone-stack-4.2.0.json. When trying to access it directly through my browser, it throws an Access Denied error. It looks like the community template isn't available in the public Neo4J S3 bucket. The other templates (enterprise and cluster) are working fine though. Maybe the S3 settings aren't correct on this specific file, or is this template not available at all? Thank you, ... View more

Hello I know Link Prediction algorithms are still in alpha but could you add to the documentation the different possibilities for the "direction" parameter? Regards, Cobra ... View more

I created a new database. I had installed APOC and the Graph DS Lib plugins for the previously created database. Now I get a caution triangle and it shows the pop info window that says: This plugin is not installed in these local graphs: Name of my new DB To install it for individual graphs go to [Manage] -> [Plugins] and click install But I can't find [Manage] anywhere! I clicked on all the icons in the left side of the Desktop and Browser window. I looked at all the menu items (I'm on a Mac). This is with Desktop 1.3.10 I usually find the Neo4J GUI easy to use, but not this time! (Later).... I finally figured it out: I need to click on the "+ Add Plugin" button that's in the "Graph Apps" section. So one minor GUI bug is that "[Manage]" is wrong. I added the plugin for APOC and it worked. But I discovered a second minor GUI bug. If I stop the newly created DB and start the old one, then I get a warning triangle over the Graph DS Lib Plugin. However, the popup error says: This plugin is not installed in these local graphs: EMPTY LINE To install it for individual graphs go to [Manage] -> [Plugins] and click install which sort of makes sense because Graph DS Lib has been installed for the old DB. Note there is no warning triangle for APOC. I suspect the warning states didn't get reset when I started the old DB. ... View more

I'm just getting started with Neo4J, which is incredible! I'm following the documentation for neo-admin load and think there's a typo? I couldn't get the regular expressions to work unless the paths are in double quotes. They are in the text but not in the example script. Very minor but thought it worth pointing out? B.2.4.1. Using regular expressions for specifying multiple input files ... If we use the regular expression movies4.* , the sorting will place the header file last and the import will fail. A better alternative would be to name the header file explicitly and use a regular expression that only matches the names of the data files. For example: --nodes "import/movies4-header.csv,movies-data.*" will accomplish this. Using the same data files as in the previous example, the call to neo4j-admin import can be simplified to: neo4j_home$ bin/neo4j-admin import --nodes=import/movies4-header.csv,import/movies4-part.* --nodes=import/actors4-header.csv,import/actors4-part.* --relationships=import/roles4-header.csv,import/roles4-part.* I think this might need to be (with quotes)... neo4j_home$ bin/neo4j-admin import --nodes="import/movies4-header.csv,import/movies4-part.*" --nodes="import/actors4-header.csv,import/actors4-part.*" --relationships="import/roles4-header.csv,import/roles4-part.*" https://neo4j.com/docs/operations-manual/current/tutorial/import-tool/ ... View more

Please provide a reference to the following UDC page for version 4.0: https://neo4j.com/docs/operations-manual/3.4/configuration/usage-data-collector/ ... View more

I am just getting started with neo4j. I was hoping to start by documenting and providing examples of how I intend to organize the project nodes and relationships at a general level. I saw the GraphGist (https://portal.graphgist.org/submit_graphgist). Questions: I was not able to get the web page https://portal.graphgist.org/submit_graphgist to generate a preview -- is it broken? It looks like graghgist is basically an extension of .adoc so that neo4j/cypher can be embedded in a doc -- can I use this locally with neo4j desktop and create local .adoc's? Thanks for the help, Bob. ... View more

https://neo4j.com/docs/labs/apoc/current/algorithms/path-finding-procedures/#path-finding-procedures apoc.algo.dijkstra(startNode, endNode, 'KNOWS|<WORKS_WITH|IS_MANAGER_OF>', 'distance') YIELD path, weight vs Chapter 3. Procedures & Functions apoc.algo.dijkstra(startNode :: NODE?, endNode :: NODE?, relationshipTypesAndDirections :: STRING?, weightPropertyName :: STRING?, defaultWeight = NaN :: FLOAT?, numberOfWantedPaths = 1 :: INTEGER?) :: (path :: PATH?, weight :: FLOAT?) Submitted via team-docs by David Pecollet ... View more

Looks like the documentation for matching on multiple relationship types is out of date? https://neo4j.com/docs/cypher-manual/current/clauses/match/#match-on-multiple-rel-types Caused by: org.neo4j.ogm.exception.CypherException: Cypher execution failed with code 'Neo.ClientError.Statement.SyntaxError': The semantics of using colon in the separation of alternative relationship types in conjunction with the use of variable binding, inlined property predicates, or variable length is no longer supported. Please separate the relationships types using `:A|B|C` instead (line 1, column 214 (offset: 213))' ... View more

On this page, in the Cypher LOAD CSV alternative route (https://neo4j.com/developer/example-project/#app-project-data), the example given uses toInt , which is obsolete syntax and fails on 4.0. Also line 201 of the CSV file at https://www.dropbox.com/s/ci3cjwy91dp3a7e/movies_setup.csv?dl=0 contains the value "James Reston, Jr.;" which contains a comma and thus breaks the CSV parsing. Change toInt to toInteger . Maybe just remove the comma from "James Reston, Jr.;" ... View more

Hi, I found the following parts to need updating on chapter 3.4 import in the graph algorithms documentation: the names of the files are not correct anymore, any .json file of the yelp dataset now has a yelp_academic_dataset_ before the old name the import script for tips calls a map value that no longer exists. likes has been replaced by compliment_count more errata in the comments if I find other things that don't work link to the specific chapter of docs: https://neo4j.com/docs/graph-algorithms/current/yelp-example/?&_ga=2.73701264.321930910.1585048967-292239439.1580847145&_gac=1.14886786.1581886550.EAIaIQobChMIsuqZyfrW5wIVjLB7Ch2qtgDZEAEYASAAEgLwV_D_BwE#yelp-import ... View more

Hi, I'm able to build a Docker container for neo4j on a Ubuntu server that will be integrated with a broader set of services (linked through docker-compose), but I'm struggling trying to figure out how to include an existing graph.db file. I'm using what I believe to be the basic Dockerfile for the Dockerhub neo4j image: FROM openjdk:11-jdk-slim ENV NEO4J_SHA256=63c85ee709916f9f5fa2fac7274f1a55bdd44d6ab353cbdd05f050aed9532e82 \ NEO4J_TARBALL=neo4j-community-4.0.0-unix.tar.gz \ NEO4J_EDITION=community \ NEO4J_HOME="/var/lib/neo4j" \ TINI_VERSION="v0.18.0" \ TINI_SHA256="12d20136605531b09a2c2dac02ccee85e1b874eb322ef6baf7561cd93f93c855" ARG NEO4J_URI=https://dist.neo4j.org/neo4j-community-4.0.0-unix.tar.gz RUN addgroup --system neo4j && adduser --system --no-create-home --home "${NEO4J_HOME}" --ingroup neo4j neo4j COPY ./local-package/* /tmp/ COPY ./data/* /tmp/data/ RUN apt update \ && apt install -y curl wget gosu jq \ && curl -L --fail --silent --show-error "https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini" > /sbin/tini \ && echo "${TINI_SHA256} /sbin/tini" | sha256sum -c --strict --quiet \ && chmod +x /sbin/tini \ && curl --fail --silent --show-error --location --remote-name ${NEO4J_URI} \ && echo "${NEO4J_SHA256} ${NEO4J_TARBALL}" | sha256sum -c --strict --quiet \ && tar --extract --file ${NEO4J_TARBALL} --directory /var/lib \ && mv /var/lib/neo4j-* "${NEO4J_HOME}" \ && rm ${NEO4J_TARBALL} \ && cp -r /tmp/data "${NEO4J_HOME}"/data \ && mv /tmp/data /data \ && mv "${NEO4J_HOME}"/logs /logs \ && chown -R neo4j:neo4j /data \ && chmod -R 777 /data \ && chown -R neo4j:neo4j /logs \ && chmod -R 777 /logs \ && chown -R neo4j:neo4j "${NEO4J_HOME}" \ && chmod -R 777 "${NEO4J_HOME}" \ && ln -s /logs "${NEO4J_HOME}"/logs \ && mv /tmp/neo4jlabs-plugins.json /neo4jlabs-plugins.json \ && rm -rf /tmp/* \ && rm -rf /var/lib/apt/lists/* \ && apt-get -y purge --auto-remove curl ENV PATH "${NEO4J_HOME}"/bin:$PATH WORKDIR "${NEO4J_HOME}" VOLUME /data /logs COPY docker-entrypoint.sh /docker-entrypoint.sh EXPOSE 7474 7473 7687 ENTRYPOINT ["/sbin/tini", "-g", "--", "/docker-entrypoint.sh"] CMD ["neo4j"] But it's not clear to me what I need to modify to allow access to an existing database that can persist outside of the container (it currently contains ~2 gigs of data, and should be available even when I close the container). Any help would be appreciated! ... View more