ruby on rails - How to use an array to use Paperclip's photo.url method? -

-

the app:
application has many buses. each bus has many photos of interior , exterior. some of interior photos have associated image indicates location on bus photos taken (like "you here" marker on map), assigned through :parent_id attribute corresponds "parent" photos id.

the goal:
output url "child" image if selected photo "parent," , keep blank if not.

the problem:
way know how find particular associated image brings array. unfortunately me, photo.url method comes paperclip can't work array.

this closest want, but, again, brings array can't use find image url.

def assigned_floorplan(where pass in parent images params)   bus_images.all(conditions: { is_floorplan: true, parent_id: params.id }) end

is dead end, or there way pull out id of associated image array can use photo.url method? or going wrong way? i'm willing approach problem totally differently if have suggestions.

you have call photo.url method each image separately. nested loop work:

<% @parent_images.each |parent_image| %>    <%= parent_image.photo.url %>    <% parent_image.child_images.each |child_image| %>     <%= child_image.photo.url %>   <% end %>  <% end %>

Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

java - Copying object fields -

-
what best way of copying classes when need have 2 independent variables? have simple class: public class myclass { boolean = false; string b= "not empty"; } do need make method : assign(myclass data ) { a= data.a; b= data.b; } is there automatic method copy (duplicate) objects in java? do need make method : pretty close. instead of making method, should make constructor. such constructors called copy constructor , , create them this: myclass(myclass data) { = data.a; b = data.b; } and create copy of instance, use constructor this: myclass obj1 = new myclass(); myclass obj2 = new myclass(obj1); copy constructor can tedious : using copy constructor create deep-copy can tedious, when class has mutable fields. in case, assignment create copy of reference, , not object itself. have create copy of fields (if want deep copy). can go recursive. a better way create deep copy serialize , deserialize object. why not use clone()? ...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more