Sometimes there is need to get some default value in place of null values from a list, that was the reason I came across: withLazyDefault and withEagerDefault methods. My use case consisted of a list of user names with possibility of null elements, hence wherever the element was null, I wanted to return “unknown”. Although […]
In one of my recent project, i want to use grails web-flow with ajax call. It’s very easy to implement the web-flow with ajax call. Grails web-flow always track the actions on the basis of eventId & flow execution key. So, to implement ajax call in web-flow, we have to pass the event id & […]
Today I found two very interesting methods: takeWhile and dropWhile. The names itself reveals their work i.e. takeWhile (consider while some condition is true) and dropWhile (ignore while some condition is true). Although, these methods have been added to Groovy 1.8.7, but for character sequence, these methods are supported in Groovy 2.0 only. The takeWhile […]
I had two applications that communicate with each other through web-services. There I had a requirement to send multi-part file from one application to another. After searching I came out with the following solution and thought to share: [java] import org.apache.http.entity.mime.MultipartEntity import org.apache.http.entity.mime.HttpMultipartMode import org.apache.http.entity.mime.content.InputStreamBody import org.apache.http.entity.mime.content.StringBody import groovyx.net.http.* void sendMultiPartFile(CommonsMultipartFile multipartImageFile, String cityName) { […]
A few days ago I faced a problem of evaluating dynamic expressions on domain objects. The scenario was that, depending upon the user input, I needed to sort a list of objects on some properties, which were nested deep in the object, e.g., [java] student.course?.college?.name // if a user chose to sort students by college […]
Suppose a scenario, where User and Account classes are linked as below: [groovy] class Account { String email String password // … other fields } class User { Account account String name String address // … other fields } [/groovy] At the time of creating a new User, and accessing the user members, we write […]
Hi, In one of my Grails project, i needed to ‘Like’ any Facebook wall post using facebook API. I searched about it and found a way to achieve this using Facebook Graph API and thought it worth sharing. To achieve it, we should have a valid facebook access_token, which can be obtained using steps described […]
Hi, In my recent grails project, i needed to post images to the albums for Facebook Profile/ Fan page/ Group using facebook API. I searched a lot and find a way to achieve this using Facebook Graph API. To post any content over facebook, we need to have facebook access_token which can be obtained using […]
Perhaps, you know it before or just skipped it after going through Java API. But I really found it very helpful at this point. Recently, I had a requirement in an open-source project, where users can iterate through the objects saved in collections (esp. List). But the problem was, we really didn’t want users […]
