Add a validation block in the School model to merge the errors: class School < ActiveRecord::Base has_many :students validate do |school| school.students.each do |student| next if student.valid? student.errors.full_messages.each do |msg| # you can customize the error message here: errors.add_to_base(“Student Error: #{msg}”) end end end end Now @school.errors will contain the correct errors: format.xml { render … Read more
You are comparing a composite index with a set of independent indices. They are just different. Think of it this way: a compound index gives you rapid look-up of the first field in a nested set of fields followed by rapid look-up of the second field within ONLY the records already selected by the first … Read more
Try this: Announcement.where(“publish = ? AND expires < ?”, true, Date.today)
In Rails 4 Student. find_or_initialize_by(:user_id => current_user.id). update_attributes!(:department => 1)
Yes, this makes sense. There is a practice of consolidating migrations. To do this, simply copy the current schema into a migration, and delete all the earlier migrations. Then you have fewer files to manage, and the tests can run faster. You need to be careful doing this, especially if you have migrations running automatically … Read more
To see if a ActiveRecord object has changed, you can call: instance.changed? To see if a specific attribute was changed, you can do: instance.attr_changed? where attr is the attribute you want to check. To check for if a nested model changed, you can just do: instance.nested_model.changed?
This doesn’t make much sense, as you already pointed. The current_user doesn’t belong to model logic at all, it should be handled on the controller level. But you can still create scope like that, just pass the parameter to it from the controller: scope :instanceprojects, lambda { |user| where(“projects.instance_id = ?”, user.instance_id) } Now you … Read more
This works with MySQL, SQLite3, and Postgres: ActiveRecord::Base.connection.tables.each do |table| puts ActiveRecord::Base.connection.indexes(table).inspect end But I think it only gives you the indexes you specifically created. Also, to find out which adapter is in use: ActiveRecord::Base.connection.class
This looks like what you need: $this->db->where(‘order_date >=’, $first_date); $this->db->where(‘order_date <=’, $second_date); return $this->db->get(‘orders’);
Now that Rails 4.1 includes enums you can do the following: class Attend < ActiveRecord::Base enum size: [:yes, :no, :maybe] validates :size, inclusion: { in: sizes.keys } end Which then provides you with a scope (ie: Attend.yes, Attend.no, Attend.maybe), a checker method to see if certain status is set (ie: #yes?, #no?, #maybe?), along with … Read more