I don't really know. Sometimes movies claim to be based on true stories but have a lot of fictional elements added. You could check reviews or the official description for more clarity.
I'm not sure specifically which 'Rescuing Ruby' true story you're referring to. It could be about rescuing a person named Ruby, or perhaps an animal. There are many stories with that title or similar themes.
Rescuing Ruby in this real story could also be a more symbolic rescue. Ruby could represent an idea or a community. For example, if Ruby was the name given to an old building that was about to be demolished but some people thought it had historical or cultural value. So they launched a campaign to'rescue' it. They would have to go through legal procedures, raise funds, and convince the authorities to spare the building. This kind of story could show the power of people's determination and their love for something that is important to them.
Since we don't have the full story, it's hard to say for sure. But if Ruby is a person, the main characters could be Ruby herself and the people who rescued her. Maybe it was a group of friends or family members who noticed she was in trouble and decided to help.
Well, it claims to be based on a true story. But in the process of turning it into a production, there could be artistic liberties taken that might deviate slightly from the pure facts.