Question

I am working in rails 2.. I have a doubt.

In my application , i have 3 models like

Blog, Wiki , Media

I am trying to create an array like @final with all the blogs , wikis, medias posted under my application .

I have tried with

@blogs = Blog.all
@wikis = Wiki.all
@medias = Media.all

@final = []
@final << @blogs << @wikis << @medias

The above final array has 3 arrays in it..

But i am expecting to keep final array with the objects returned from 3 models

How to do so ??
PLease give suggestions

EDIT

I thing i tried is

 @final = []
 @blogs = Blog.all
 @wikis = Wiki.all
 @medias = Media.all
 @final = @blogs + @wikis + @medias

This is performing exactly what i need .. But its just listing all the blogs , medias and wikis. How to list all the entities based on the creation date of the particular object

Answer 1

You’re using the wrong operator, you want this:

@final = @blogs + @wikis + @medias

The << operator for an Array:

Pushes the given object on to the end of this array.

whereas the + operator:

Returns a new array built by concatenating the two arrays together to produce a third array.

You could also use flatten if you were really attached to << for some reason:

@final = (@final << @blogs << @wikis << @medias).flatten

but that would be a bit pointless. As noted by powerMicha, you need to start the << chain off with @final (or some temporary array) if you don’t want to modify any of the @blogs, @wikis, or @medias arrays.

As far as sorting them goes, you could use sort_by!:

@final.sort_by(&:created_at)

That assumes that you have the usual created_at method on the objects.