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Neo4j Graph Data Modelling

You're reading from   Neo4j Graph Data Modelling Design efficient and flexible databases by optimizing the power of Neo4j

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Product type Paperback
Published in Jul 2015
Publisher
ISBN-13 9781784393441
Length 138 pages
Edition 1st Edition
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Concepts
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Author (1):
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Mahesh K Lal Mahesh K Lal
Author Profile Icon Mahesh K Lal
Mahesh K Lal
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Toc

Table of Contents (11) Chapters Close

Preface 1. Graphs Are Everywhere 2. Modeling Flights and Cities FREE CHAPTER 3. Formulating an Itinerary 4. Modeling Bookings and Users 5. Refactoring the Data Model 6. Modeling Communication Chains 7. Modeling Access Control 8. Recommendations and Analysis of Historical Data 9. Wrapping Up Index

Adding comments to Neo4j


As discussed earlier, comments can be used by users to ask more questions or clarify something to other users. Since chronology is important, we will create a chain for the comments. The assumption here is that for a new question or clarification, a new comment chain will be started with the first comment in the chain being in response to the review being commented on.

Before we add comments, we should set up a constraint on comments to ensure that we don't create comments with the same ID, as shown in the following query:

neo4j-sh (?)$ CREATE CONSTRAINT ON (comment:Comment) ASSERT comment._id IS UNIQUE;

The output of the preceding query is as follows:

+-------------------+
| No data returned. |
+-------------------+
Constraints added: 1

To add a comment to the review, we can use the following query:

CREATE (comment:Comment{_id:"df23c188-2349-11e5-8966-6c40089a9424", text:"What was wrong with the service?", created_on: 1391550607.342643}))
WITH comment
MATCH (review:Review...
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