In previous articles we
told you how to operate with columns in adminhtml grids. Usually the process is quite fast, for example, if you want to add simple column from the database. But sometimes you need to add column with complex value, processed by renderer. You say: “it’s
not a big deal to use renderers…” Right, until you face with sort and filter.. By
default Magento applies grid filter directly to the corresponding column. But renderer might contain data from separate columns. At this point we need to choose right way to make filter and sort work correctly. For example, we are going to add a new column
“Address”
to the orders grid which consists of the values from few columns: city, street, postcode.
First of all, we should join address table to the collection:
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The second step is to add address column to the grid:
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Here we should connect column with the data. Let’s add ‘renderer‘
param:
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Third, create the renderer:
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After these steps we are able to see the new column in the orders grid. But when you try to use filter on this column – you will get
the result, filtered by ‘city’ db column, since we have added city as
an index. To solve the problem we need to do one more thing: create callback method for the filter. The final view of addColumn calling
is going to be like the following one:
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Note, that we have removed index field – we don’t need it anymore. And then, we create callback method which is described below:
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As you can see, we are using simple db query condition to filter query results by the columns. This way you can create your own
filters for columns with complex values or custom renderers. Feel free to ask any questions and suggest your own improvements.
原文：http://www.atwix.com/magento/grid-filter-for-columns/
PS：在magento的后台grid，用“renderer”来处理最终显示的内容是很常用的一种做法，但这会带来一个问题是，经过“renderer”的那一列没法像普通的列一样用过滤，这篇文章就是针对这个问题给出了解决方案，而且用的还是原生结构就支持的方式，这里的关键词就是“filter_condition_callback”，至于为什么可以这样用，可以看下Core_Adminhtml_Block_Widget_Grid里的_addColumnFilterToCollection方法，这里不再详细解释