Class: DataFilter::PrefixFilter

Inherits:
Object
  • Object
show all
Defined in:
lib/data_filter/prefix_filter.rb

Overview

Used to filter a data item by a prefix by seeing if the data field value starts with the prefix

Examples:

object = MyModel.new(text: 'hello world!')
filter = DataFilter::PrefixFilter.new(:text, 'hello')
filter.call(object)
# => #<MyModel text: 'hello world'>

Instance Method Summary collapse

Constructor Details

#initialize(field_sym, prefix) ⇒ PrefixFilter

Returns a new instance of PrefixFilter.

Parameters:

  • field_sym (Symbol) —

    name of the data method we want to filter

  • prefix (String) —

    the value we want to use when filtering the data item



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# File 'lib/data_filter/prefix_filter.rb', line 15

def initialize(field_sym, prefix)
  @field_sym = field_sym
  @prefix = prefix
end

Instance Method Details

#call(item) ⇒ Object?

Filters the item

Parameters:

  • item (Object) —

    the item we want to filter

Returns:

  • (Object, nil) —

    the original data item



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# File 'lib/data_filter/prefix_filter.rb', line 24

def call(item)
  if item.respond_to?(@field_sym) &&
    starts_with?(item.public_send(@field_sym), @prefix)
    item
  end
end