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Tag Archives: Grails

Working with sass scripts in Grails 2.3.X

Sass is one of the most mature, stable, and powerful professional grade CSS extension language available. Before we can use Sass, we need to set it up on our project. In grails-2.4.X, it is very easy to use sass through asset pipeline plugin. But with grails-2.3.x version, we need to follow these steps: Step 1 Install Ruby with RVM:   ...

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Fetching List of message codes from message.properties

Normally messages from message properties are fetched via, key i.e. message code, What if we want to select more than one message property, like a list. To get a list of select message codes from message.properties, we need to customize messageSource bean. To do that, lets create a class ‘CustomisedPluginAwareResourceBundleMessageSource’ which should extend class ‘PluginAwareResourceBundleMessageSource’. To fetch all properties we ...

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Grails Tutorial for Beginners – Criteria API

This tutorial will show how to use Criteria API to search data from the database. Criteria is a powerful API and an elegant alternative to HQL. Introduction This previous post showed that HQL is a powerful way to perform complex queries. However, it is not very elegant if an HQL statement is not fixed and needs to be concatenated. For ...

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Grails render images on the fly in GSP

This tutorial will show how to generate PNG images on the fly and display inside a GSP. This can serve as a basis on how to create a more complex behavior. For example, creating report graphs for display in your applications. Sample Output This tutorial will show how to generate simple shapes based on input size and color. Squares and ...

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Grails Tutorial for Beginners – Grails Service Layer

This tutorial will discuss the importance of the service layer in Grails and how to work with it. It also explains transaction management and how to utilize it. Introduction Separation Of Concerns Consider this analogy: Imagine a company where employees are assigned tasks on different nature of work. For example, say there is an employee named John Doe with the ...

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Grails domain classes and special presentation requirements

In Grails we often use our domain objects directly as backing model for presentation purposes and only for specialized situations we create value holder objects or DTOs. Beginning Grails developers know how to display individual entity properties pretty easy in a GSP, such as the name of a fictional domain class…             <g:each in=”${breedingGoals}” var=”breedingGoal”> ...

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Grails Tutorial for Beginners – Grails Service Layer

This tutorial will discuss the importance of the service layer in Grails and how to work with it. It also explains transaction management and how to utilize it. Introduction Separation Of Concerns Consider this analogy: Imagine a company where employees are assigned tasks on different nature of work. For example, say there is an employee named John Doe with the ...

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