In my posts form the input to the model can only be Dog or Cat, I’ve constructed the following code and assumed it would work, however the information input into the select_tag box was never going into my database.

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<% form_for(@post) do |f| %>

    <%= f.label :title %><br />
    <%= f.text_field :title %>

    <%= f.label :source %><br />
    <%= select_tag :source,  options_for_select([ "Dog", "Cat") %>

    <%= f.submit 'Create' %>

<% end %>

I finally got this to work by using;

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<%= f.select(:source, options_for_select({ : Dog =>'Dog',:Cat =>'Cat'} %>

If you put the options in a hash then they will be output in a random order, to output the options in a chosen order they need to be put into an array, this left me with the following code.

View

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<%= f.label :source %><br />
<%= f.select(:source, options_for_select(@source)) %>

Controller

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@source = [['Dog'],['Cat'],]