Method: Datagrid::Core::ClassMethods#dynamic

Defined in:

lib/datagrid/core.rb

#dynamic(&block) ⇒ void

This method returns an undefined value.

Allows dynamic columns definition, that could not be defined at class level Columns that depend on the database state or third party service can be defined this way.

Examples:

class MerchantsGrid

  scope { Merchant }

  column(:name)

  dynamic do
    PurchaseCategory.all.each do |category|
      column(:"#{category.name.underscore}_sales") do |merchant|
        merchant.purchases.where(category_id: category.id).count
      end
    end
  end
end

ProductCategory.create!(name: 'Swimwear')
ProductCategory.create!(name: 'Sportswear')

grid = MerchantsGrid.new
grid.data # => [
          #      [ "Name",   "Swimwear Sales", "Sportswear Sales", ... ]
          #      [ "Reebok", 2083382,            8382283,          ... ]
          #      [ "Nike",   8372283,            18734783,         ... ]
          #    ]

Parameters:

• block (Proc) —

  block that defines dynamic columns

# File 'lib/datagrid/core.rb', line 135

def dynamic(&block)
  previous_block = dynamic_block
  self.dynamic_block =
    if previous_block
      proc {
        instance_eval(&previous_block)
        instance_eval(&block)
      }
    else
      block
    end
end