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application_helper.rb
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Sun, Nov 24, 5:16 PM

application_helper.rb
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module ApplicationHelper
# Custom helper for better display of big numbers
# @example number_by_magnitude(4242)
# "4.2K"
#
# @param number[Numeric]
# @return [String] human friendly respresentation
def number_by_magnitude(number)
number_to_human(number, units: { thousand: :K, million: :M, billion: :G })
end
# Creates a bootstrap form-group div with an additional 'Add' button next to the select field
#
# @param object[ActiveRecord::Object] the form's subject
# @param resource[Symbol] the objects class
# @param attr[Symbol] the select box's attribute
# @param attr_name[String] the attribute's display name
# @param options[Array] the select box options
# @param path[String] the add button's path
def select_with_errors_and_button(object, resource, attr, attr_name, options, path)
has_errors = object.errors[attr].present?
content_tag(:div, class: "form-group #{' has-error' if has_errors }") do
attr_label = label(resource, attr, attr_name, class: 'control-label col-xs-5 required')
select_div = content_tag(:div, class: 'col-xs-5') do
select_part = select_tag([resource, attr].join('_').to_sym,
options,
include_blank: true,
name: "#{resource}[#{attr}]",
class: 'form-control'
)
if has_errors
select_part.concat(content_tag(:span, class: 'help-block') { object.errors[attr].first })
end
select_part
end
button_part = content_tag(:div, class: 'col-xs-1') do
link_to path do
content_tag(:span, class: 'glyphicon glyphicon-plus text-success') {}
end
end
attr_label.concat(select_div).concat(button_part)
end
end
# Returns a style class depending on the given parameter
#
# @param status[Char]
def success_class(status)
case status
when 'T' then 'success'
when 'E' then 'danger'
when 'f' then 'fatal'
end
end
# Fetches the html class for a given path
#
# @param path[String] the path to check for
# @param partial[Boolean] forces a left partial match
#
# @return [Hash] { class: 'active' } if the given path is the current page
def active_class(path, partial = false)
if current_page?(path) || (partial && request.path.starts_with?(path))
{ class: 'active' }
else
{}
end
end
# Constructs a breadcrumb out the given options
#
# @param options[Hash] a hash containing the breadcrumb links in name: path sets
# @return an html ol breadcrumb
def breadcrumb_with(options)
content_tag(:ol, class: 'breadcrumb') do
options.map { |name, path|
content_tag(:li, active_class(path)) do
link_to_if !current_page?(path), name, path
end
}.inject { |result, element| result.concat(element) }
end
end
# Constructs a list with the given array elements
#
# @example:
# inline_list([:foo, :bar])
#
# <ul class="list-inline'>
# <li><span class="label label-default">foo</span></li>
# <li><span class="label label-default">bar</span></li>
# </ul>
#
# @param arr[Array]
# @return an html ul list
def inline_list(arr)
content_tag(:ul, class: 'list-inline') do
arr.map { |element|
content_tag(:li) do
content_tag(:span, class: 'label label-default') do
element
end
end
}.inject { |result, element| result.concat(element) }
end
end
# Generates a span with a yes or no and the corresponding formatting
# according to the value's falseness
#
# @param value[Integer]
def yes_no(value)
klass = value == 1 ? 'label label-success' : 'label label-danger'
text = value == 1 ? 'yes' : 'no'
content_tag(:span, class: klass) { text }
end
# Generates a percentage and adds some color coding for better visibility
#
# @param ratio [Numeric] the ratio
# @param quota [Integer] the client's space quota
#
# @return [String] an html label tag
def pretty_percentage(ratio, quota)
color = ([[ratio, 0.2].max, 0.99].min * 256).to_i.to_s(16) << '0000'
content_tag(:label, class: 'label', style: "background-color:##{color}") do
number_to_percentage(100 * ratio, precision: 1)
end
end
# Generates a button that may be disabled
#
# @param disabled[Boolean]
# @param display_text[String]
# @param url[String]
# @param opts[Hash]
def button_or_disabled(disabled, display_text, url, opts = {})
if disabled
url = '#'
opts.merge!(disabled: true)
opts.reverse_merge!(title: 'Client is blocked')
opts.delete(:method)
else
opts.delete(:title)
end
link_to display_text, url, opts
end
end

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