QueryDSL Predicate Builder

Quick setup

1. Add Maven dependencies

   <dependency>
       <groupId>ro.andreimatei</groupId>
       <artifactId>querydsl-predicate-builder</artifactId>
       <version>1.1</version>
   </dependency>
   <dependency>
        <groupId>com.querydsl</groupId>
        <artifactId>querydsl-jpa</artifactId>
        <version>4.2.1</version>
   </dependency>
   <dependency>  
       <groupId>com.querydsl</groupId>
       <artifactId>querydsl-apt</artifactId>
       <version>4.2.1</version>
       <scope>provided</scope>
   </dependency>
   

2. Add Maven build plugin (JPA/Mongodb)

   2.1 JPA

   <plugin>
       <groupId>com.mysema.maven</groupId>
       <artifactId>apt-maven-plugin</artifactId>
       <version>1.1.3</version>
       <executions>
           <execution>
               <goals>
                   <goal>process</goal>
               </goals>
               <configuration>
                   <outputDirectory>target/generated-sources/java</outputDirectory>
                   <processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
               </configuration>
           </execution>
       </executions>
   </plugin>
   

   2.2 MongoDB

   <plugin>
       <groupId>com.mysema.maven</groupId>
       <artifactId>apt-maven-plugin</artifactId>
       <version>1.1.3</version>
       <executions>
           <execution>
               <goals>
                   <goal>process</goal>
               </goals>
               <configuration>
                   <outputDirectory>target/generated-sources/java</outputDirectory>
                   <processor>
                       org.springframework.data.mongodb.repository.support.MongoAnnotationProcessor
                   </processor>
               </configuration>
           </execution>
       </executions>
   </plugin>

3. Annotate each entity with @Config. E.g.:

   @Config(defaultVariableName = "ClassName")
   

4. Implement QuerydslPredicateExecutor for each Spring Repository. E.g:

   public interface ExampleRepository extends JpaRepository<ClassName, Long>, QuerydslPredicateExecutor<ClassName> { }
   

5. Run Maven build. This will generate all QClasses under target/generated-sources/java

6. Example usage

   QueryDSLPredicatesBuilder queryDSLPredicatesBuilder = new QueryDSLPredicatesBuilder(ClassName.class);
   ClassNameRepository.findAll(queryDSLPredicatesBuilder.with(filter).build(), pageable);
   

Notes:

If you intend to use a class that inherits from an external dependency: Create package-info.java at module level with the following structure:

 @QueryEntities({com.externalClass.Resource1.class, com.externalClass.Resource2.class})
 package com.package.model;
 
 import com.querydsl.core.annotations.QueryEntities;