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Can a throw or delete expression ever be dependent?


Can a throw or delete expression ever be dependent?

By : user2955289
Date : November 22 2020, 10:38 AM
it helps some times Let's go back to when typename is required. §14.6 [temp.res]/p3, all quotes are from N4140:
code :


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Throw an error if a dependent control is not present on the page

Throw an error if a dependent control is not present on the page


By : user1812223
Date : March 29 2020, 07:55 AM
will be helpful for those in need For scripts specifically, ASP.NET already has a nice ScriptManager class that supports what you're trying to do. Call
code :
Page.ClientScript.RegisterClientScriptInclude(key, url);
public ControlManager GetControlManager()
{
    foreach (Control control in Page.Controls)
    {
        if (control is ControlManager)
            return (ControlManager)control;
    }

    ControlManager manager = new ControlManager();
    Page.Controls.Add(manager);

    return manager;
}
Why does :dependent => :restrict throw an error?

Why does :dependent => :restrict throw an error?


By : ThatDude
Date : March 29 2020, 07:55 AM
I wish did fix the issue. :dependent cannot be used with has_and_belongs_to_many. The docs you link to list the association methods that accept it: has_many, has_one and belongs_to.
You could add a before_remove hook and do your dependent check manually.
:dependent => :delete on belongs_to doesn't delete owner object

:dependent => :delete on belongs_to doesn't delete owner object


By : OllieB93
Date : March 29 2020, 07:55 AM
like below fixes the issue Yes, calling delete generally skips all callbacks that either you or rails set on destroying the record. These include callbacks like before_destroy and also destroying associated records.
Therefore if you call p.delete it will not do anything with the associated records.
Julia-Lang Metaprogramming: turn expression into function with expression-dependent arguments

Julia-Lang Metaprogramming: turn expression into function with expression-dependent arguments


By : user3518208
Date : March 29 2020, 07:55 AM
This might help you Base.Cartesian has an unexported function lreplace which may be what you're after. Then you can do something like:
code :
julia> values = Dict(:A=>3, :B=>1)
Dict{Symbol,Int64} with 2 entries:
  :B => 1
  :A => 3

julia> import Base.Cartesian.lreplace

julia> expr = :(2*A)
:(2A)

julia> function lreplace_all(expr, d)
       for (k, v) in d
           expr = lreplace(expr, k, v)
       end
       expr
       end
lreplace_all (generic function with 1 method)

julia> lreplace_all(expr, values)
:(2 * 3)

julia> @eval foo(A) = $(lreplace_all(:(2A), values))
foo (generic function with 1 method)

julia> foo(1)
6
julia> dictreplace!(ex, s, v) = ex
dictreplace! (generic function with 1 method)

julia> dictreplace!(ex::Symbol, s, v) = s == ex ? v : ex
dictreplace! (generic function with 2 methods)

julia> function dictreplace!(ex::Expr, s, v)
           for i=1:length(ex.args)
               ex.args[i] = dictreplace!(ex.args[i], s, v)
           end
       ex
       end
dictreplace! (generic function with 3 methods)

julia> dictreplace(ex, s, v) = dictreplace!(copy(ex), s, v)
dictreplace (generic function with 1 method)
julia> function dictreplace_all(expr, kys, dsym)
           for k in kys
               expr = dictreplace(expr, k, :($(dsym)[$(QuoteNode(k))]))
           end
       expr
       end
dictreplace_all (generic function with 1 method)

julia> dictreplace_all(:(2A), keys(values), :d)
:(2 * d[:A])

julia> @eval foo(args) = $(dictreplace_all(:(2A), keys(values), :args))
foo (generic function with 1 method)

julia> values[:A] = -99
-99

julia> foo(values)
-198
Rails: why cannot delete dependent table if dependent: :destroy allowed?

Rails: why cannot delete dependent table if dependent: :destroy allowed?


By : atar
Date : March 29 2020, 07:55 AM
With these it helps first I want to thank you for your insight and good will to help.
Taking it from where you left it off, I tell you how I solved this, which had me 2 days, until today when waking up, I thought I could try it.
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