generator-jhipster: Interactive entity generator fails on TypeError: Cannot read property 'toLowerCase' of undefined

Overview of the issue

While using the entity interactive generator, and creating a many to one relationship to another entity The process fails on ERROR! TypeError: Cannot read property 'toLowerCase' of undefined Just a line after Everything is configured, generating the entity.... Generating this entity with same relationship from <EntityName>.json works just fine

Motivation for or Use Case

Interactively generation entity with many-to-one relationship to another entity

Reproduce the error

Step 1

Welcome to JHipster v6.8.0

 _______________________________________________________________________________________________________________

  Documentation for creating an application is at https://www.jhipster.tech/creating-an-app/
  If you find JHipster useful, consider sponsoring the project at https://opencollective.com/generator-jhipster
 _______________________________________________________________________________________________________________

? Which *type* of application would you like to create? Monolithic application (recommended for simple projects)
? [Alpha] Do you want to make it reactive with Spring WebFlux? No
? What is the base name of your application? jhipster
? What is your default Java package name? com.norr.tr
? Do you want to use the JHipster Registry to configure, monitor and scale your application? No
? Which *type* of authentication would you like to use? JWT authentication (stateless, with a token)
? Which *type* of database would you like to use? SQL (H2, MySQL, MariaDB, PostgreSQL, Oracle, MSSQL)
? Which *production* database would you like to use? MySQL
? Which *development* database would you like to use? MySQL
? Do you want to use the Spring cache abstraction? Yes, with the Ehcache implementation (local cache, for a single node)
? Do you want to use Hibernate 2nd level cache? Yes
? Would you like to use Maven or Gradle for building the backend? Maven
? Which other technologies would you like to use? (Press <space> to select, <a> to toggle all, <i> to invert selection)
? Which *Framework* would you like to use for the client? Angular
? Would you like to use a Bootswatch theme (https://bootswatch.com/)? Default JHipster
? Would you like to enable internationalization support? No
? Besides JUnit and Jest, which testing frameworks would you like to use? (Press <space> to select, <a> to toggle all, <i> to invert selection)
? Would you like to install other generators from the JHipster Marketplace? No

Step 2

➜  final-rrr git:(master) jhipster entity author
INFO! Using JHipster version installed locally in current project's node_modules
INFO! Executing jhipster:entity author
INFO! Options: from-cli: true

The entity author is being created.


Generating field #1

? Do you want to add a field to your entity? Yes
? What is the name of your field? name
? What is the type of your field? String
? Do you want to add validation rules to your field? No

================= Author =================
Fields
name (String) 


Generating field #2

? Do you want to add a field to your entity? No

================= Author =================
Fields
name (String) 


Generating relationships to other entities

? Do you want to add a relationship to another entity? No

================= Author =================
Fields
name (String) 



? Do you want to use separate service class for your business logic? Yes, generate a separate service class
? Do you want to use a Data Transfer Object (DTO)? No, use the entity directly
? Do you want to add filtering? Not needed
? Is this entity read-only? No
? Do you want pagination on your entity? Yes, with pagination links

Everything is configured, generating the entity...

   create .jhipster/Author.json
   create src/main/resources/config/liquibase/changelog/20200327222530_added_entity_Author.xml
   create src/main/resources/config/liquibase/fake-data/author.csv
   create src/main/java/com/norr/tr/domain/Author.java
   create src/main/java/com/norr/tr/repository/AuthorRepository.java
   create src/main/java/com/norr/tr/web/rest/AuthorResource.java
   create src/main/java/com/norr/tr/service/AuthorService.java
   create src/test/java/com/norr/tr/web/rest/AuthorResourceIT.java
   create src/test/java/com/norr/tr/domain/AuthorTest.java
 conflict src/main/resources/config/liquibase/master.xml
? Overwrite src/main/resources/config/liquibase/master.xml? overwrite this and all others

Step 3

➜  final-rrr git:(master) ✗ jhipster entity book 
INFO! Using JHipster version installed locally in current project's node_modules
INFO! Executing jhipster:entity book
INFO! Options: from-cli: true

The entity book is being created.


Generating field #1

? Do you want to add a field to your entity? Yes
? What is the name of your field? title
? What is the type of your field? String
? Do you want to add validation rules to your field? No

================= Book =================
Fields
title (String) 


Generating field #2

? Do you want to add a field to your entity? No

================= Book =================
Fields
title (String) 


Generating relationships to other entities

? Do you want to add a relationship to another entity? Yes
? What is the name of the other entity? author
? What is the name of the relationship? author
? What is the type of the relationship? many-to-one
? When you display this relationship on client-side, which field from 'author' do you want to use? This field will be displayed as a String, so it cannot be a Blob name
? Do you want to add any validation rules to this relationship? No

================= Book =================
Fields
title (String) 

Relationships
author (Author) many-to-one 


Generating relationships to other entities

? Do you want to add a relationship to another entity? No

================= Book =================
Fields
title (String) 

Relationships
author (Author) many-to-one 



? Do you want to use separate service class for your business logic? Yes, generate a separate service class
? Do you want to use a Data Transfer Object (DTO)? No, use the entity directly
? Do you want to add filtering? Not needed
? Is this entity read-only? No
? Do you want pagination on your entity? Yes, with pagination links

Everything is configured, generating the entity...

ERROR! TypeError: Cannot read property 'toLowerCase' of undefined

Here after step 3 I’m getting the error ERROR! TypeError: Cannot read property ‘toLowerCase’ of undefined

Related issues

Suggest a Fix

JHipster Version(s)

Jhipster 6.8.0

JHipster configuration

Entity configuration(s) entityName.json files generated in the .jhipster directory

Author.json:

{
    "fluentMethods": true,
    "clientRootFolder": "",
    "relationships": [],
    "fields": [
        {
            "fieldName": "name",
            "fieldType": "String"
        }
    ],
    "changelogDate": "20200327222530",
    "dto": "no",
    "searchEngine": false,
    "service": "serviceClass",
    "entityTableName": "author",
    "databaseType": "sql",
    "readOnly": false,
    "jpaMetamodelFiltering": false,
    "pagination": "pagination"
}

Browsers and Operating System

Operating system MacOS Catalina version 10.15.2

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