ruby-on-rails-5

问题 I need to set the background image inline using the style tag, but it needs to reference an image object and not a fixed image from the assets folder. Below is my code to show what I am attempting to do. <div class="background-image-holder" style="background: url(#{" image_path @product.photo_one_url(:original)"}); opacity: 1;"> <%= image_tag(@product.photo_one_url(:medium)) %> </div> 回答1: I always prefer to use a content_tag if I'm including something dynamic like this, i.e. <%= content_tag

问题 I want to use ActionController::Parameters.action_on_unpermitted_parameters = :raise To raise an exception unpermitted parameters are passed in, but I only want to do this on specific controller methods, instead of setting it in /config/ and having it apply to the whole environment. Is there any way to do so? 回答1: Update : (taking inspiration from Mike's answer) To restrict the change only for a set of controller actions and to revert it back to the original value that the class attribute was

问题 I have a problem where I believe my sqlite3 database is too big. I imported around 100,000 records into a database and I was able to "git push" and "git push heroku." Now I probably made a mistake and imported too many records...500,000. I was able to push to git(and now it states around 336MB in bitbucket) and that seems to work but when i push to heroku this is what i get: /workspace/new_foodback$ git push heroku Counting objects: 26, done. Delta compression using up to 8 threads.

问题 I have two entities with a many-to-one relationship. User has many Addresses. When creating a User I want the form to also create a single Address. The entities are nested. Approach 1: The code below works, but only saves the User, no associated Address. Reading around, I thought that the accepts_nested_attributes_for would automatically save the address. I'm not sure, but it may be that this isn't working because the parameters I'm getting into the Controller don't actually appear to be

问题 I have several tables that have foreign key constraints associated with them, each referencing the other in a hierarchical fashion as outlined below. When I try to destroy a Company that has at least 1 Project, that has at least 1 Task, that has at least 1 TaskTime like so... irb(main):014:0> Company.first.destroy I get the below output and error. I am under the impression now that simply having dependent: :delete_all doesn't deal with the foreign key constraints, is this true? If so, how do

问题 I have several tables that have foreign key constraints associated with them, each referencing the other in a hierarchical fashion as outlined below. When I try to destroy a Company that has at least 1 Project, that has at least 1 Task, that has at least 1 TaskTime like so... irb(main):014:0> Company.first.destroy I get the below output and error. I am under the impression now that simply having dependent: :delete_all doesn't deal with the foreign key constraints, is this true? If so, how do

问题 I have several tables that have foreign key constraints associated with them, each referencing the other in a hierarchical fashion as outlined below. When I try to destroy a Company that has at least 1 Project, that has at least 1 Task, that has at least 1 TaskTime like so... irb(main):014:0> Company.first.destroy I get the below output and error. I am under the impression now that simply having dependent: :delete_all doesn't deal with the foreign key constraints, is this true? If so, how do

问题 I have several tables that have foreign key constraints associated with them, each referencing the other in a hierarchical fashion as outlined below. When I try to destroy a Company that has at least 1 Project, that has at least 1 Task, that has at least 1 TaskTime like so... irb(main):014:0> Company.first.destroy I get the below output and error. I am under the impression now that simply having dependent: :delete_all doesn't deal with the foreign key constraints, is this true? If so, how do

问题 I have several tables that have foreign key constraints associated with them, each referencing the other in a hierarchical fashion as outlined below. When I try to destroy a Company that has at least 1 Project, that has at least 1 Task, that has at least 1 TaskTime like so... irb(main):014:0> Company.first.destroy I get the below output and error. I am under the impression now that simply having dependent: :delete_all doesn't deal with the foreign key constraints, is this true? If so, how do

问题 I have several tables that have foreign key constraints associated with them, each referencing the other in a hierarchical fashion as outlined below. When I try to destroy a Company that has at least 1 Project, that has at least 1 Task, that has at least 1 TaskTime like so... irb(main):014:0> Company.first.destroy I get the below output and error. I am under the impression now that simply having dependent: :delete_all doesn't deal with the foreign key constraints, is this true? If so, how do