Module: ExpressTemplates::Components::Capabilities::Iterating::ClassMethods

Defined in:
lib/express_templates/components/capabilities/iterating.rb

Instance Method Summary collapse

Instance Method Details

#for_each(iterator, as: :item, emit: :markup, empty: nil) ⇒ Object

Sets the component up to use iterating logic to reproduce a fragment for a collection.

Parameters include an iterator that may be :@variable assumed to be available in context or a proc that when evaluated in the context should return a collection.

An :emit option may specify a fragment to emit. Defaults to :markup

An :as option specifies the local variable name for each item in the collection for use in the fragment. Defaults to: item

An :empty option specifies a fragment to use for the empty state when the iterator returns an empty collection.



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# File 'lib/express_templates/components/capabilities/iterating.rb', line 49

def for_each(iterator, as: :item, emit: :markup, empty: nil)
  as = as.to_sym
  emit = emit.to_sym
  iterator = iterator.kind_of?(Proc) ? iterator.source : iterator
  fragment_src = if empty
%Q(-> {
  unless_block(Proc.from_source("-> {#{iterator}.call.empty?}"), alt: #{self[empty].source}) {
    for_each(Proc.from_source("#{iterator}"), as: #{as.inspect}) {
      #{self[emit].source_body}
    }
  }
})
  else
%Q(-> {
  for_each(Proc.from_source("#{iterator}"), as: #{as.inspect}) {
    #{self[emit].source_body}
  }
})
  end
  fragment = Proc.from_source(fragment_src)
  _store :markup, fragment
end