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我正在建立一個預訂系統,用戶可以在其中搜索公開預訂。 :on
作用域篩選給定日期和時間的預定,並創建一個reserved_table_ids
的數組。如果在選定的日期/時間有保留,則@reserved_tables
和@open_tables
包含正確的表格ID。但是,如果在選定的日期/時間沒有任何預訂,則reserved_table_ids
爲空,@reserved_tables
和@open_tables
爲空。如果reserved_table_ids
爲空,有關如何剷除所有table_id到@open_tables
的任何想法?或者我應該考慮其他方法嗎? (滑軌5.0.1)Rails保留系統
型號:
class Reservation < ApplicationRecord
belongs_to :user, optional: true
belongs_to :table, optional: true
scope :on, -> (day, time) { where('date = ? AND starts_at <= ? AND ends_at > ?', day, time, time)}
end
class Table < ApplicationRecord
has_many :reservations
has_many :users, through: :reservations
def self.free_on(day, time)
reserved_table_ids = Reservation.on(day, time).pluck('DISTINCT table_id')
where.not(id: reserved_table_ids)
end
def self.reserved_on(day, time)
reserved_table_ids = Reservation.on(day, time).pluck('DISTINCT table_id')
where(id: reserved_table_ids)
end
end
class User < ApplicationRecord
has_many :reservations
has_many :tables, through: :reservations
end
控制器:
class TablesController < ApplicationController
def index
@reserved_tables = Table.reserved_on(params[:day], params[:time])
@open_tables = Table.free_on(params[:day], params[:time])
end
end
查看:
<%= form_tag(tables_path, :method => "get", id: "table-search-form") do %>
<%= text_field_tag :day, params[:day], class:"datepicker", placeholder: "Select Day" %>
<%= text_field_tag :time, params[:time], class:"timepicker", placeholder: "Select Time" %>
<%= submit_tag "Search", :name => nil %>
<% end %>
我想有條件的太多,但我喜歡你的三元解決方案,因爲它是清潔的。謝謝! – rymcmahon