Vue : Filter on array of object for search
You define model as an empty object in your data method.
Even if you are setting the value of model later, your filteredRow method will fire when the component renders the template, meaning this.model.data will be undefined at that point.
The simplest fix would be to give model.data an initial value in the data method:
data() { return { model: { data: [] }, columns: {}, query: { search_input: '' }, }},