Adjusting alignment of bars to x-axis labels in ggplot

Question

I wrote the code below which works without errors but the two bars are not aligned with x-axis labels "pre" and "post." I have tried incorporating the solution here but it does not seem to fix the misalignment issue in my case.

dput(df[1:2, c(1,2,3,4)])

output:

structure(list(treatment = c(0, 1), total_posts = c(2055L, 
866L), count = c(77L, 22L), collective_share = c(3.74695863746959, 
2.54041570438799)), row.names = c(NA, -2L), class = c("tbl_df", 
"tbl", "data.frame"))

graph code:

ggplot(data = df, aes(x = treatment, fill=treatment,  y = share)) +
    geom_bar(stat = "identity", position=position_dodge()) + 
    ylab("% Share of mentions") + 
    theme(text=element_text(size=10)) +
    scale_x_discrete(limits = c("pre", "post"))+
  labs(fill='implementation')+ 
      xlab("Period")  +
    theme(plot.title = element_text(size = 10, face = "bold")) 

Answer 1

If you are using scale_x_discrete, then your x value should be a factor, not numeric. And then you just need to set the labels=, not the limits=

ggplot(data = collective_action_mentions, aes(x = factor(treatment_implementation), fill=treatment_implementation,  y = collective_share)) +
  geom_bar(stat = "identity", position=position_dodge()) + 
  ylab("% Share of collective action mentions") + 
  theme(text=element_text(size=10)) +
  scale_x_discrete(labels = c("pre","post"))+
  labs(fill='Policy implementation')+ 
  xlab("Period")  +
  theme(plot.title = element_text(size = 10, face = "bold"))